Java Beginning
I am VB programmer who wants to learn Java. I found the book for beginners and started. But I already stopped.First example from the book I can not make to work.
I made .java file and saved on same location where my java is.
C:\Program Files\Java\jre1.5.0_05\bin
By instruction from book I have to run first compiler.When I run
C:\Program Files\Java\jre1.5.0_05\bin>javac Example.java
I have error like there, " 'javac' is not recognized as an internal or external command operable program or batch file.
Here is my program;
class Example {
public static void main(String args[]) {
System.out.println("Hello World");
}
I think u have not set ur classpath..
No, classpath has nothing to do with that error. It's PATH. And/or the fact that he installed JRE instead of JDK. And it's explained in the link that jsalonen and I posted.
Set classpath to ur java bin:
C:\Program Files\Java\jre1.5.0_05\binNo, don't.
Similar Messages
-
Tough question for java beginning expert
Hi, y'all,
I couldn't compile "HelloWorld". I downloaded jdk1.3.1_01 and tried to compile "HelloWorld" in MS-DOS. However, the error is: "cannot read HelloWorld.java." I couldn't figure out what's wrong.
Here's my source code:---------
class HelloWorld{
public static void main (String[ ] args) {
System.out.println("What's wrong with you?");
Here's my DOS command:--------
Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:\>cd java\
C:\java>dir
Volume in drive C has no label.
Volume Serial Number is 07D1-0B0D
Directory of C:\java
11/23/2001 01:06p <DIR> .
11/23/2001 01:06p <DIR> ..
11/24/2001 01:37a 135 HelloWorld.java.txt
1 File(s) 135 bytes
2 Dir(s) 76,506,595,328 bytes free
C:\java>javac HelloWorld.java
error: cannot read: HelloWorld.java
1 error
C:\java>cd c:\
C:\>jdk1.3.1_01\bin\javac HelloWorld.java
error: cannot read: HelloWorld.java
1 error
C:\>
Please Help me. Thanks.
leeYes, notepad has this "helpful" feature of adding ".txt" to the name of files whose extension is not registered. You'll need to register the "java"-file type if you don't want to get problems like this again.
On the other hand, notepad is not a very text editor for programming in the first place, so I recommend getting a more adept one. Features that you should be looking for include sytax highlighting and bracket matching - they make it easier to spot stupid typos. -
JNI Invocation: open file in Java, write file in CPP
Hello,
Warning: I am a dunce, bad CPP code ahead!
Using JNI invocation, I am trying to read a binary file in Java and write it in CPP.
Everything compiles and runs without error, but the input and output jpg files are of course different.
TIA to any help,
kirst
(begin ByteMe.java)
import java.io.*;
public class ByteMe
// Returns the contents of the file in a byte array.
public byte[] getBytesFromFile(String strInfo) throws IOException
System.out.println("Testing:" + strInfo);
File file = new File("1.jpg");
InputStream is = new FileInputStream(file);
// Get the size of the file
long length = file.length();
// Create the byte array to hold the data
byte[] bytes = new byte[(int)length];
// Read in the bytes
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
offset += numRead;
// Ensure all the bytes have been read in
if (offset < bytes.length)
throw new IOException("Could not completely read file "+file.getName());
// Close the input stream and return bytes
is.close();
return bytes;
public ByteMe()
//System.out.println("in constructor");
}(end ByteMe.java)
(begin ByteMe.cpp)
#include <stdlib.h>
#include <string.h>
#include <jni.h>
#include <windows.h>
// for file operations:
#include <fstream>
int main( int argc, char *argv[] )
JNIEnv *env;
JavaVM *jvm;
JavaVMInitArgs vm_args;
JavaVMOption options[5];
jint res;
jclass cls;
jmethodID mid;
jstring jstr;
jobject obj_print;
options[0].optionString = "-Xms4M";
options[1].optionString = "-Xmx64M";
options[2].optionString = "-Xss512K";
options[3].optionString = "-Xoss400K";
options[4].optionString = "-Djava.class.path=.";
vm_args.version = JNI_VERSION_1_4;
vm_args.options = options;
vm_args.nOptions = 5;
vm_args.ignoreUnrecognized = JNI_FALSE;
// Create the Java VM
res = JNI_CreateJavaVM(&jvm,(void**)&env,&vm_args);
if (res < 0)
printf("Can't create Java VM");
goto destroy;
cls = env->FindClass("ByteMe");
if (cls == 0)
printf("Can't find ByteMe class");
goto destroy;
jmethodID id_construct = env->GetMethodID(cls,"<init>","()V");
jstr = env->NewStringUTF(" from C++\n");
obj_print = env->NewObject(cls,id_construct);
// signature obtained using javap -s -p ByteMe
mid = env->GetMethodID(cls, "getBytesFromFile", "(Ljava/lang/String;)[B");
if (mid == 0)
printf("Can't find ByteMe.getBytesFromFile\n");
goto destroy;
else
jbyteArray jbuf = (jbyteArray) env->CallObjectMethod(obj_print,mid,jstr);
jlong size = jsize(jbuf);
printf("size is: %d\n", size); // size shown in output is
std::ofstream out("data.jpg", std::ios::binary);
out.write ((const char *)jbuf, 100000);
destroy:
if (env->ExceptionOccurred())
env->ExceptionDescribe();
jvm->DestroyJavaVM();
}(end ByteMe.cpp)Hello,
Me again. Well, not such a dunce after all. Here is code that works correctly, and compiles with no errors and no warnings.
Will much appreciate help with clean-up code.
TIA,
kirst
(begin ByteMe.java)
import java.io.*;
public class ByteMe
public long getFilezize(String strInfo) throws IOException
// demonstrates String parameter passed from CPP to Java:
System.out.println("(getFilesize) Hello world" + strInfo);
File file = new File("1.bmp");
InputStream is = new FileInputStream(file);
// Get the size of the file
long length = file.length();
is.close();
return length;
// Returns the contents of the file in a byte array.
public byte[] getBytesFromFile(String strInfo) throws IOException
System.out.println("(getBytesFromFile) Hello world" + strInfo);
File file = new File("1.bmp");
InputStream is = new FileInputStream(file);
// Get the size of the file
long length = file.length();
System.out.println("length is: " + String.valueOf(length));
// Create the byte array to hold the data
byte[] bytes = new byte[(int)length];
// Read in the bytes
int offset = 0;
int numRead = 0;
while (offset < bytes.length && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0)
offset += numRead;
// Ensure all the bytes have been read in
if (offset < bytes.length)
throw new IOException("Could not completely read file "+ file.getName());
// Close the input stream and return bytes
is.close();
return bytes;
public ByteMe()
//System.out.println("in constructor");
}(end ByteMe.java)
(begin ByteMe.cpp)
Signature obtained with command:
"C:\Program Files\Java\jdk1.5.0_15\bin\javap.exe" -s -p ByteMe
Compiled from "ByteMe.java"
public class ByteMe extends java.lang.Object{
public long getFilezize(java.lang.String) throws java.io.IOException;
Signature: (Ljava/lang/String;)J
public byte[] getBytesFromFile(java.lang.String) throws java.io.IOException;
Signature: (Ljava/lang/String;)[B
public ByteMe();
Signature: ()V
Compiled VC++ 2005 Express, run on Vista
#include <stdlib.h>
#include <string.h>
#include <jni.h>
// file operations
#include <fstream>
int main( int argc, char *argv[] )
JNIEnv *env;
JavaVM *jvm;
JavaVMInitArgs vm_args;
JavaVMOption options[5];
jint res;
jclass cls;
jmethodID mid;
jmethodID sizeid;
jstring jstr;
jobject obj_print;
jlong filesize;
options[0].optionString = "-Xms4M";
options[1].optionString = "-Xmx64M";
options[2].optionString = "-Xss512K";
options[3].optionString = "-Xoss400K";
options[4].optionString = "-Djava.class.path=.";
vm_args.version = JNI_VERSION_1_4;
vm_args.options = options;
vm_args.nOptions = 5;
vm_args.ignoreUnrecognized = JNI_FALSE;
// Create the Java VM
res = JNI_CreateJavaVM(&jvm,(void**)&env,&vm_args);
if (res < 0)
printf("Can't create Java VM");
goto destroy;
cls = env->FindClass("ByteMe");
if (cls == 0)
printf("Can't find ByteMe class");
goto destroy;
jmethodID id_construct = env->GetMethodID(cls,"<init>","()V");
printf("%s\n",id_construct);
jstr = env->NewStringUTF(" from C++!\n");
if (jstr == 0)
// Normally not useful
printf("Out of memory (could not instantiate new string jstr)\n");
goto destroy;
obj_print = env->NewObject(cls,id_construct);
//BEGIN BLOCK to get file size
sizeid = env->GetMethodID(cls, "getFilezize", "(Ljava/lang/String;)J");
if (sizeid == 0)
printf("Can't find ByteMe.getFilezize\n");
goto destroy;
else
printf("got here\n");
filesize =(jlong) env->CallObjectMethod(obj_print,sizeid,jstr);
printf("got filesize\n");
// END BLOCK to get file size
// BEGIN BLOCK to write file
mid = env->GetMethodID(cls, "getBytesFromFile", "(Ljava/lang/String;)[B");
if (mid == 0)
printf("Can't find ByteMe.getBytesFromFile\n");
goto destroy;
else
jbyteArray ret =(jbyteArray) env->CallObjectMethod(obj_print,mid,jstr);
// Access the bytes:
jbyte *retdata = env->GetByteArrayElements(ret, NULL);
// write the file
std::ofstream out("data.bmp", std::ios::binary);
//out.write ((const char *)retdata, 921654);
out.write ((const char *)retdata, (long)filesize);
// END BLOCK to write file
destroy:
if (env->ExceptionOccurred())
env->ExceptionDescribe();
jvm->DestroyJavaVM();
}(end ByteMe.cpp) -
Permission problem calling a java object from a store procedure
When I run my store procedure
CREATE OR REPLACE PACKAGE BODY confirms_write_to_file
AS
FUNCTION translate(in_en_var in VARCHAR2)
RETURN VARCHAR2
AS LANGUAGE JAVA
NAME 'translate.translatePath(java.lang.String) return java.lang.String';
PROCEDURE write_to_file(in_file_name IN VARCHAR, in_en_var IN VARCHAR)
IS
file_handle UTL_FILE.FILE_TYPE;
file_location VARCHAR2(50);
BEGIN
file_location := translate(in_en_var);
dbms_output.put_line ('opened file location' ||file_location);
END write_to_file;
END confirms_write_to_file;
I get the following error:
exec confirms_write_to_file.write_to_file('zzzz','$RIMS_LOG');
SQL> exec confirms_write_to_file.write_to_file('zzzz','$RIMS_LOG');
Exception java.security.AccessControlException: the Permission
(java.io.FilePermission <<ALL FILES>> execute) has not been granted by
dbms_java.grant_permission to
SchemaProtectionDomain(RIMS|PolicyTableProxy(RIMS))
opened file locationProcess problem
PL/SQL procedure successfully completed.
When I try to to grant myself the permissions
begin
dbms_java.grant_permission('rims','java.io.FilePermission','*','execute');
dbms_java.grant_permission('rims', 'java.lang.RuntimePermission', '*','writeFileDescriptor' );
end;
I get the following Error:
oracle.aurora.vm.IdNotFoundException: rims is not a user or role
at oracle.aurora.rdbms.DbmsRealm.getId(DbmsRealm.java)
at oracle.aurora.rdbms.DbmsRealm.getId(DbmsRealm.java)
at
oracle.aurora.rdbms.security.PolicyTableManager.findAll(PolicyTableManager.java)
at oracle.aurora.rdbms.security.PolicyTableManager.find(PolicyTableManager.java)
at
oracle.aurora.rdbms.security.PolicyTableManager.activate(PolicyTableManager.java
at
oracle.aurora.rdbms.security.PolicyTableManager.grant(PolicyTableManager.java)
begin
ERROR at line 1:
ORA-29532: Java call terminated by uncaught Java exception:
oracle.aurora.vm.IdNotFoundException: rims is not a user or role
ORA-06512: at "SYS.DBMS_JAVA", line 0
ORA-06512: at line 2
My java code is as follows
import java.io.*;
import java.util.*;
class translate
public static String translatePath(String envar)
Runtime rt = Runtime.getRuntime();
int bufSize = 4096;
byte buffer[] = new byte[bufSize];
String path = null;
Process p = null;
int len = 0;
try
p = rt.exec("echo "+envar);
BufferedInputStream bis = new BufferedInputStream(p.getInputStream());
while ((len = bis.read(buffer, 0, bufSize)) != -1)
System.out.write(buffer, 0, len);
path = new String(buffer);
p.waitFor();
catch(Exception e)
System.out.println("Exception "+e);
return "Process problem ";
return path;Tony,
I answered this very same question that you posted at the JavaRanch forum.
Good Luck,
Avi. -
Procedure to make a Java address book
Hi all,
I am a java beginer . I am planning to make some small projects. My first attempt is an Address Book . I want to know what all are the things i have to know to make an address book in java. I want to know how can i connect the code to the database. I am planning to use Microsoft Access as the Database .
Regards
Rahulrahulreigns wrote:
Hi pals,
Thanks a lot for your valuable replies. But still I have to go through some more clarifications . how to connect through the embedded database like derby . Also how to make those data to be added in the database . I mean how to code those things.
I am just a beginner in java . I have lots of doubts . But right now pls help me in these problems that i have mentioned here.
Thanks and Regards
RahulWell if you really are new then you are jumping WAY ahead. You need to start at the beginning getting to know things liek variables, classes, objects, methods, scope, polymorphic behavior. You are IN NO shape to jump straight into database and collections before doing the basics. Java takes time about a year I would say if you are dedicated to get to where you are now... (databases).
Get a good book like Head First Java and do lots of basic code. I have an oudated book that taught me well about the very basics and the reason was it was FULL FULL of excercises.
Java Programming Comprehensive Concepts and techiques
Java Head First
and google.
So long as theres java 5 or 6 in the title you will do great. -
Java application not release memory
I have java 1.3 or 1.4, my application start correctly.
I have set heap a 4Mb but process java begin consume ram, initialy start with 7MB after 12-15 hour the process have above 60% system mem (128Mb).
After 16-18 hour kernel kill process.
I have Ubuntu distribution
Thanksit is difficult to address this question without having a knowledge of the application. Here are some suggestions:
(1) run the application from within Java Studio in debug mode. This will give you an idea of what is absorbing the memory. The idea here is to be able to watch your data structures grow. Any tool that allows you to do this will help. See http://developers.sun.com/prodtech/javatools/jsenterprise/index.html
for Java Studio Enterprise.
(2) the chances are very good that your application is creating some sort of Collection (Set, Hashtable, Vector, ...) and slowly adding to it. This is very common and a common cause of "memory leak".
(3) The garbage collector in Java frees memory as objects go out of scope. If the objects never go out of scope, they are never garbage collected.
(4) If you have these such objects or collections that must always be accessable, consider adding some caching mechanism (putting the data to disk) whereby keeping your datastructures smaller.
(5)Also, when you say "set the heap" I am assuming you used the -Xmx and -Xms command line options. If not, look into these. -
Hello!
I`m having trouble getting a simple hello world application to work in the emulator.
I keep getting a classnotfoundexception: Hello
My original file is called Hello.java and it says its built ok.
I`m guessing i`m probably completely missing an essential part out to be getting this for a helloworld app.
Any ideas? :-DTwo possibilities:
-- Hello.java does not declarepublic class Hello extends MIDlet-- Hello.java begins with a package statement that does not correspond correctly to the folder hierarchy.
db -
CTD bug in simple video streaming applet.
I'm trying to write a simple applet to use JMF to allow an end-user to view a video stream that's being served up by VLC. It doesn't have to look immensely pretty (in fact, streamlined is what I want most). I swiped some code from the jicyshout project (http://jicyshout.sourceforge.net) which handles streaming MP3s, and borrowed a framework for an applet from one of Sun's example applets for the JMF.
Here's my code so far:
** begin file SimpleVideoDataSource.java **
import java.lang.String;
import java.net.*;
import java.io.*;
import java.util.Properties;
import javax.media.*;
import javax.media.protocol.*;
/* The SeekableStream and DataSource tweaks are based on the code from
* jicyshout (jicyshout.sourcefourge.net), which was written by Chris Adamson.
* The code was simplified (no need for mp3 metadata here), cleaned up, then
* extended for our puposes.
* This is a DataSource using a SeekableStream suitable for
* streaming video using the default parser supplied by JMF.
public class SimpleVideoDataSource extends PullDataSource {
protected MediaLocator myML;
protected SeekableInputStream[] seekStreams;
protected URLConnection urlConnection;
// Constructor (trivial).
public SimpleVideoDataSource (MediaLocator ml) throws MalformedURLException {
super ();
myML = ml;
URL url = ml.getURL();
public void connect () throws IOException {
try {
URL url = myML.getURL();
urlConnection = url.openConnection();
// Make the stream seekable, so that the JMF parser can try to parse it (instead
// of throwing up).
InputStream videoStream = urlConnection.getInputStream();
seekStreams = new SeekableInputStream[1];
seekStreams[0] = new SeekableInputStream(videoStream);
} catch (MalformedURLException murle) {
throw new IOException ("Malformed URL: " + murle.getMessage());
} catch (ArrayIndexOutOfBoundsException aioobe) {
fatalError("Array Index OOB: " + aioobe);
// Closes up InputStream.
public void disconnect () {
try {
seekStreams[0].close();
} catch (IOException ioe) {
System.out.println ("Can't close stream. Ew?");
ioe.printStackTrace();
// Returns just what it says.
public String getContentType () {
return "video.mpeg";
// Does nothing, since this is a stream pulled from PullSourceStream.
public void start () {
// Ditto.
public void stop () {
// Returns a one-member array with the SeekableInputStream.
public PullSourceStream[] getStreams () {
try {
// **** This seems to be the problem. ****
if (seekStreams != null) {
return seekStreams;
} else {
fatalError("sourceStreams was null! Bad kitty!");
return seekStreams;
} catch (Exception e) {
fatalError("Error in getStreams(): " + e);
return seekStreams;
// Duration abstract stuff. Since this is a theoretically endless stream...
public Time getDuration () {
return DataSource.DURATION_UNBOUNDED;
// Controls abstract stuff. No controls supported here!
public Object getControl (String controlName) {
return null;
public Object[] getControls () {
return null;
void fatalError (String deathKnell) {
System.err.println(":[ Fatal Error ]: - " + deathKnell);
throw new Error(deathKnell);
** end file SimpleVideoDataSource.java **
** begin file SeekableInputStream.java **
import java.lang.String;
import java.net.*;
import java.io.*;
import java.util.Properties;
import javax.media.*;
import javax.media.protocol.*;
/* The SeekableStream and DataSource tweaks are based on the code from
* jicyshout (jicyshout.sourcefourge.net), which was written by Chris Adamson.
* The code was simplified (no need for mp3 metadata here), cleaned up, then
* extended for our puposes.
/* This is an implementation of a SeekableStream which extends a
* BufferedInputStream to basically fake JMF into thinking that
* the stream is seekable, when in fact it's not. Basically, this
* will keep JMF from puking over something it expects but can't
* actually get.
public class SeekableInputStream extends BufferedInputStream implements PullSourceStream, Seekable {
protected int tellPoint;
public final static int MAX_MARK = 131072; // Give JMF 128k of data to "play" with.
protected ContentDescriptor unknownCD;
// Constructor. Effectively trivial.
public SeekableInputStream (InputStream in) {
super (in, MAX_MARK);
tellPoint = 0;
mark (MAX_MARK);
unknownCD = new ContentDescriptor ("unknown");
// Specified size constructor.
public SeekableInputStream (InputStream in, int size) {
super (in, Math.max(size, MAX_MARK));
tellPoint = 0;
mark(Math.max(size, MAX_MARK));
unknownCD = new ContentDescriptor ("unknown");
// Reads a byte and increments tellPoint.
public int read () throws IOException {
int readByte = super.read();
tellPoint++;
return readByte;
// Reads bytes (specified by PullSourceStream).
public int read (byte[] buf, int off, int len) throws IOException {
int bytesRead = super.read (buf, off, len);
tellPoint += bytesRead;
return bytesRead;
public int read (byte[] buf) throws IOException {
int bytesRead = super.read (buf);
tellPoint += bytesRead;
return bytesRead;
// Returns true if in.available() <= 0 (that is, if there are no bytes to
// read without blocking or end-of-stream).
public boolean willReadBlock () {
try {
return (in.available() <= 0);
} catch (IOException ioe) {
// Stick a fork in it...
return true;
// Resets the tellPoint to 0 (meaningless after you've read one buffer length).
public void reset () throws IOException {
super.reset();
tellPoint = 0;
// Skips bytes as expected.
public long skip (long n) throws IOException {
long skipped = super.skip(n);
tellPoint += skipped;
return skipped;
// Trivial.
public void mark (int readLimit) {
super.mark (readLimit);
// Returns the "unknown" ContentDescriptor.
public ContentDescriptor getContentDescriptor () {
return unknownCD;
// Lengths? We don't need no stinkin' lengths!
public long getContentLength () {
return SourceStream.LENGTH_UNKNOWN;
// Theoretically, this is always false.
public boolean endOfStream () {
return false;
// We don't provide any controls, either.
public Object getControl (String controlName) {
return null;
public Object[] getControls () {
return null;
// Not really... but...
public boolean isRandomAccess () {
return true;
// This only works for the first bits of the stream, while JMF is attempting
// to figure out what the stream is. If it tries to seek after that, bad
// things are going to happen (invalid-mark exception).
public long seek (long where) {
try {
reset();
mark(MAX_MARK);
skip(where);
} catch (IOException ioe) {
ioe.printStackTrace();
return tell();
// Tells where in the stream we are, adjusted for seeks, resets, skips, etc.
public long tell () {
return tellPoint;
void fatalError (String deathKnell) {
System.err.println(":[ Fatal Error ]: - " + deathKnell);
throw new Error(deathKnell);
** end file SeekableInputStream.java **
** begin file StreamingViewerApplet.java **
* This Java Applet will take a streaming video passed to it via the applet
* command in the embedded object and attempt to play it. No fuss, no muss.
* Based on the SimplePlayerApplet from Sun, and uses a modified version of
* jicyshout's (jicyshout.sourceforge.net) tweaks to get JMF to play streams.
* Use it like this:
* <!-- Sample HTML
* <APPLET CODE="StreamingViewerApplet.class" WIDTH="320" HEIGHT="240">
* <PARAM NAME="code" VALUE="StreamingViewerApplet.class">
* <PARAM NAME="type" VALUE="application/x-java-applet;version=1.1">
* <PARAM NAME="streamwidth" VALUE="width (defaults to 320, but will resize as per video size)">
* <PARAM NAME="streamheight" VALUE="height (defaults to 240, but will resize as per video size)">
* <PARAM NAME="stream" VALUE="insert://your.stream.address.and:port/here/">
* </APPLET>
* -->
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.lang.String;
import java.lang.ArrayIndexOutOfBoundsException;
import java.net.URL;
import java.net.MalformedURLException;
import java.net.*;
import java.io.*;
import java.io.IOException;
import java.util.Properties;
import javax.media.*;
import javax.media.protocol.*;
public class StreamingViewerApplet extends Applet implements ControllerListener {
Player player = null;
Component visualComponent = null;
SimpleVideoDataSource dataSource;
URL url;
MediaLocator ml;
Panel panel = null;
int width = 0;
static int DEFAULT_VIDEO_WIDTH = 320;
int height = 0;
static int DEFAULT_VIDEO_HEIGHT = 240;
String readParameter = null;
// Initialize applet, read parameters, create media player.
public void init () {
try {
setLayout(null);
setBackground(Color.white);
panel = new Panel();
panel.setLayout(null);
add(panel);
// Attempt to read width from applet parameters. If not given, use default.
if ((readParameter = getParameter("streamwidth")) == null) {
width = DEFAULT_VIDEO_WIDTH;
} else {
width = Integer.parseInt(readParameter);
// Ditto for height.
if ((readParameter = getParameter("streamheight")) == null) {
height = DEFAULT_VIDEO_HEIGHT;
} else {
height = Integer.parseInt(readParameter);
panel.setBounds(0, 0, width, height);
// Unfortunately, this we can't default.
if ((readParameter = getParameter("stream")) == null) {
fatalError("You must provide a stream parameter!");
try {
url = new URL(readParameter);
ml = new MediaLocator(url);
dataSource = new SimpleVideoDataSource(ml);
} catch (MalformedURLException murle) {
fatalError("Malformed URL Exception: " + murle);
try {
dataSource.connect();
player = Manager.createPlayer(dataSource);
} catch (IOException ioe) {
fatalError("IO Exception: " + ioe);
} catch (NoPlayerException npe) {
fatalError("No Player Exception: " + npe);
if (player != null) {
player.addControllerListener(this);
} else {
fatalError("Failed to init() player!");
} catch (Exception e) {
fatalError("Error opening player. Details: " + e);
// Start stream playback. This function is called the
// first time that the applet runs, and every time the user
// re-enters the page.
public void start () {
try {
if (player != null) {
player.realize();
while (player.getState() != Controller.Realized) {
Thread.sleep(100);
// Crashes... here?
player.start();
} catch (Exception e) {
fatalError("Exception thrown: " + e);
public void stop () {
if (player != null) {
player.stop();
player.deallocate();
} else {
fatalError("stop() called on a null player!");
public void destroy () {
// player.close();
// This controllerUpdate function is defined to implement a ControllerListener
// interface. It will be called whenever there is a media event.
public synchronized void controllerUpdate(ControllerEvent event) {
// If the player is dead, just leave.
if (player == null)
return;
// When the player is Realized, get the visual component and add it to the Applet.
if (event instanceof RealizeCompleteEvent) {
if (visualComponent == null) {
if ((visualComponent = player.getVisualComponent()) != null) {
panel.add(visualComponent);
Dimension videoSize = visualComponent.getPreferredSize();
width = videoSize.width;
height = videoSize.height;
visualComponent.setBounds(0, 0, width, height);
} else if (event instanceof CachingControlEvent) {
// With streaming, this doesn't really matter much, does it?
// Without, a progress bar of some sort would be appropriate.
} else if (event instanceof EndOfMediaEvent) {
// We should never see this... but...
player.stop();
fatalError("EndOfMediaEvent reached for streaming media. ewe ewe tea eff?");
} else if (event instanceof ControllerErrorEvent) {
player = null;
fatalError(((ControllerErrorEvent)event).getMessage());
} else if (event instanceof ControllerClosedEvent) {
panel.removeAll();
void fatalError (String deathKnell) {
System.err.println(":[ Fatal Error ]: - " + deathKnell);
throw new Error(deathKnell);
** end file StreamingViewerApplet.java **
Now, I'm still new to the JMF, so this might be obvious to some of you... but it's exploding on me, and crashing to desktop (both in IE and Firefox) with some very fun errors:
# An unexpected error has been detected by HotSpot Virtual Machine:
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x21217921, pid=3200, tid=3160
# Java VM: Java HotSpot(TM) Client VM (1.5.0_06-b05 mixed mode, sharing)
# Problematic frame:
# C 0x21217921
--------------- T H R E A D ---------------
Current thread (0x058f7280): JavaThread "JMF thread: com.sun.media.amovie.AMController@506411[ com.sun.media.amovie.AMController@506411 ] ( realizeThread)" [_thread_in_native, id=3160]
siginfo: ExceptionCode=0xc0000005, writing address 0x034e6360
(plenty more here, I can post the rest if necessary)
The problem seems to be coming from the "return seekStreams" statement in the first file; when I have execution aborted before that (with a fatalError call), it doesn't crash.
Any tips/hints/suggestions?You should write your own Applet, where you can easily get the visual component (getVisualComponent())and show it directly in your Applet (you call it "embedded"). As far as I know, all examples (AVReceive* etc.) use the component which opens a new window.
Best regards from Germany,
r.v. -
Can not get ejb20\basic\beanManaged example work with Oracle?
This is the problem I encount when switch DB from Pointbase to Oracle. Most of the examples work when I with necessary change of configuration, DD and redeployment of applications except this one:
I follow all the steps for Oracle 9i DB. But keep getting the following errors. I don't understand why the system still lookups jdbc/demoPool even I modified DD and system configuration to jdbc/oraclePool (I validate it after successfully deployed to exampleServer).
The server is WLS 8.1 running on Windows XP professional.
ant runBuildfile: build.xml
run:
[java] Beginning beanManaged.Client...
[java] Creating account ID: 0 with a balance of 0.0...
[java] java.rmi.RemoteException: EJB Exception:; nested exception is:
[java] There was an exception while creating and using the Accounts.
[java] This indicates that there was a problem communicating with the serve
r: java.rmi.RemoteException: EJB Exception:; nested exception is:
[java] javax.ejb.EJBException: nested exception is: javax.naming.NameNo
tFoundException: While trying to look up comp/env/jdbc/demoPool in /app/ejb/ejb2
0_basic_beanManaged.jar#beanManaged.; remaining name 'comp/env/jdbc/demoPool'
[java] at weblogic.rjvm.BasicOutboundRequest.sendReceive(BasicOutboundR
equest.java:108)
[java] javax.ejb.EJBException: nested exception is: javax.naming.NameNo
tFoundException: While trying to look up comp/env/jdbc/demoPool in /app/ejb/ejb2
0_basic_beanManaged.jar#beanManaged.; remaining name 'comp/env/jdbc/demoPool'
[java] at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwar
eRemoteRef.java:284)
[java] at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwar
eRemoteRef.java:244)
[java] at examples.ejb20.basic.beanManaged.beanManaged_biy1g2_HomeImpl_
813_WLStub.create(Unknown Source)
[java] at examples.ejb20.basic.beanManaged.Client.createAccount(Client.
java:157)
[java] at examples.ejb20.basic.beanManaged.Client.example(Client.java:8
6)
[java] at examples.ejb20.basic.beanManaged.Client.main(Client.java:57)
[java] Caused by: javax.ejb.EJBException: nested exception is: javax.naming
.NameNotFoundException: While trying to look up comp/env/jdbc/demoPool in /app/e
jb/ejb20_basic_beanManaged.jar#beanManaged.; remaining name 'comp/env/jdbc/demoP
ool'
[java] at examples.ejb20.basic.beanManaged.AccountBean.getConnection(Ac
countBean.java:396)
[java] at examples.ejb20.basic.beanManaged.AccountBean.ejbCreate(Accoun
tBean.java:177)
[java] at examples.ejb20.basic.beanManaged.beanManaged_biy1g2_Impl.ejbC
reate(beanManaged_biy1g2_Impl.java:195)
[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAcces
sorImpl.java:39)
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMet
hodAccessorImpl.java:25)
[java] at java.lang.reflect.Method.invoke(Method.java:324)
[java] at weblogic.ejb20.manager.DBManager.create(DBManager.java:1180)
[java] at weblogic.ejb20.manager.DBManager.remoteCreate(DBManager.java:
1129)
[java] at weblogic.ejb20.internal.EntityEJBHome.create(EntityEJBHome.ja
va:246)
[java] at examples.ejb20.basic.beanManaged.beanManaged_biy1g2_HomeImpl.
create(beanManaged_biy1g2_HomeImpl.java:76)
[java] at examples.ejb20.basic.beanManaged.beanManaged_biy1g2_HomeImpl_
WLSkel.invoke(Unknown Source)
[java] at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.ja
va:477)
[java] at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwar
eServerRef.java:108)
[java] at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.jav
a:420)
[java] at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Auth
enticatedSubject.java:363)
[java] at weblogic.security.service.SecurityManager.runAs(SecurityManag
er.java:144)
[java] at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServe
rRef.java:415)
[java] at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecut
eRequest.java:30)
[java] at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
[java] at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
[java] Exception in thread "main"
BUILD FAILED
attached are modified DD:
<?xml version="1.0"?>
<!DOCTYPE ejb-jar PUBLIC
'-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN'
'http://java.sun.com/dtd/ejb-jar_2_0.dtd'>
<ejb-jar>
<enterprise-beans>
<entity>
<ejb-name>beanManaged</ejb-name>
<home>examples.ejb20.basic.beanManaged.AccountHome</home>
<remote>examples.ejb20.basic.beanManaged.Account</remote>
<ejb-class>examples.ejb20.basic.beanManaged.AccountBean</ejb-class>
<persistence-type>Bean</persistence-type>
<prim-key-class>java.lang.String</prim-key-class>
<reentrant>False</reentrant>
<resource-ref>
<res-ref-name>jdbc/oraclePool</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</entity>
</enterprise-beans>
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name>beanManaged</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>Required</trans-attribute>
</container-transaction>
</assembly-descriptor>
<ejb-client-jar>ejb20_basic_beanManaged_client.jar</ejb-client-jar>
</ejb-jar>
and
<?xml version="1.0"?>
<!DOCTYPE weblogic-ejb-jar PUBLIC
'-//BEA Systems, Inc.//DTD WebLogic 8.1.0 EJB//EN'
'http://www.bea.com/servers/wls810/dtd/weblogic-ejb-jar.dtd'>
<weblogic-ejb-jar>
<weblogic-enterprise-bean>
<ejb-name>beanManaged</ejb-name>
<reference-descriptor>
<resource-description>
<res-ref-name>jdbc/oraclePool</res-ref-name>
<jndi-name>examples-dataSource-oracleXAPool</jndi-name>
</resource-description>
</reference-descriptor>
<jndi-name>ejb20-beanManaged-AccountHome</jndi-name>
</weblogic-enterprise-bean>
</weblogic-ejb-jar>
----------------------------------------------------There must be a reference to demoPool lurking around somewhere, I normally do a search inside all the files in the project to solve things like this.
Also clean up all temporary files and deployments before trying a redeploy.
If this does not work you can always try configuring the demoPool to use your oracle database, ugly, I know but it may help if your in a hurry to get your code working. -
JTree custom renderer setting selection background color problem
Hi,
I have a JTree with a custom icon renderer that displays an icon. The JTree is part of a TreeTable component. Iam having a problem setting the selection background uniformly for the entire row. There is no problem when there is no row selected in the JTable.
My present code looks like this:
Iam overriding paint in my renderer which extends DefaultCellRenderer.
super.paint(g);
Color bColor = null;
if(!m_selected) {
if(currRow % 2 == 0) {
bColor = Color.WHITE;
} else {
bColor = backColor;
} else {
bColor = table.getSelectionBackground(); bColor = getRowSelectionColor();
if(bColor != null) {
g.setColor(bColor);
if(!m_selected) {
g.setXORMode(new Color(0xFF, 0xFF, 0xFF));
} else {
g.setXORMode(new Color(0x00, 0x00, 0x00));
I have a color I arrive at using some algorithm that I want using method getRowSelectionColor(). The other cells in the row have this color. But the cell containing the tree node shows different color. Iam not able to arrive at the right combination of the color to set and the xor color so my tree node also looks like the other cells in the row.
It is not a problem really as the table still looks good. Its just that the tree node looks like it has been highlighted and this might cause a problem when a table cell is highlighed later on in the application ( two cells in the row would be highlighted causing confusion).
Any help would be appreciated.
Regards,
vidyutHi Camickr,
Thanks for the reply. Iam sorry I didn't include the sources the first time around. There were too many of them. I have created a small, self-contained, compilable program that demonstrates the problem and including it herewith. Still there's quite many files but they are all needed Iam afraid. The only one you will have to concern yourself fior this problem is the file IconRenderer.java. The treenode background and the other cells background are not in sync when table row is not selected in this example though. But they are in my real program. I just need them to be in sync i.e have the same background color when the row is selected.
Your help would be very much appreciated.
These are the files that are included below:
1. AbstractTreeTableModel.java
2. Bookmarks.java
3. BookmarksModel.java
4. DynamicTreeTableModel.java
5. IconRenderer.java
6. IndicatorRenderer.java
7. JTreeTable.java
8. TreeTableExample3.java (contains main)
9. TreeTableModel.java
10. TreeTableModelAdapter.java
The copyright and javadocs information has been stripped for clarity.
cheers,
vidyut
// AbstractTreeTableModel.java BEGIN
import javax.swing.tree.*;
import javax.swing.event.*;
public abstract class AbstractTreeTableModel implements TreeTableModel {
protected Object root;
protected EventListenerList listenerList = new EventListenerList();
public AbstractTreeTableModel(Object root) {
this.root = root;
// Default implementations for methods in the TreeModel interface.
public Object getRoot() {
return root;
public boolean isLeaf(Object node) {
return getChildCount(node) == 0;
public void valueForPathChanged(TreePath path, Object newValue) {}
// This is not called in the JTree's default mode:
// use a naive implementation.
public int getIndexOfChild(Object parent, Object child) {
for (int i = 0; i < getChildCount(parent); i++) {
if (getChild(parent, i).equals(child)) {
return i;
return -1;
public void addTreeModelListener(TreeModelListener l) {
listenerList.add(TreeModelListener.class, l);
public void removeTreeModelListener(TreeModelListener l) {
listenerList.remove(TreeModelListener.class, l);
protected void fireTreeNodesChanged(Object source, Object[] path,
int[] childIndices,
Object[] children) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
TreeModelEvent e = null;
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners==TreeModelListener.class) {
// Lazily create the event:
if (e == null)
e = new TreeModelEvent(source, path,
childIndices, children);
((TreeModelListener)listeners[i+1]).treeNodesChanged(e);
protected void fireTreeNodesInserted(Object source, Object[] path,
int[] childIndices,
Object[] children) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
TreeModelEvent e = null;
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==TreeModelListener.class) {
// Lazily create the event:
if (e == null)
e = new TreeModelEvent(source, path,
childIndices, children);
((TreeModelListener)listeners[i+1]).treeNodesInserted(e);
protected void fireTreeNodesRemoved(Object source, Object[] path,
int[] childIndices,
Object[] children) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
TreeModelEvent e = null;
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==TreeModelListener.class) {
// Lazily create the event:
if (e == null)
e = new TreeModelEvent(source, path,
childIndices, children);
((TreeModelListener)listeners[i+1]).treeNodesRemoved(e);
protected void fireTreeStructureChanged(Object source, Object[] path,
int[] childIndices,
Object[] children) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
TreeModelEvent e = null;
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==TreeModelListener.class) {
// Lazily create the event:
if (e == null)
e = new TreeModelEvent(source, path,
childIndices, children);
((TreeModelListener)listeners[i+1]).treeStructureChanged(e);
// Default impelmentations for methods in the TreeTableModel interface.
public Class getColumnClass(int column) { return Object.class; }
public boolean isCellEditable(Object node, int column) {
return getColumnClass(column) == TreeTableModel.class;
public void setValueAt(Object aValue, Object node, int column) {}
// Left to be implemented in the subclass:
* public Object getChild(Object parent, int index)
* public int getChildCount(Object parent)
* public int getColumnCount()
* public String getColumnName(Object node, int column)
* public Object getValueAt(Object node, int column)
// AbstractTreeTableModel.java END
// Bookmarks.java BEGIN
import java.io.*;
import java.net.*;
import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import javax.swing.text.html.parser.*;
public class Bookmarks {
/** The root node the bookmarks are added to. */
private BookmarkDirectory root;
* Creates a new Bookmarks object, with the entries coming from
* <code>path</code>.
public Bookmarks(String path) {
root = new BookmarkDirectory("Bookmarks");
if (path != null) {
parse(path);
* Returns the root of the bookmarks.
public BookmarkDirectory getRoot() {
return root;
protected void parse(String path) {
try {
BufferedReader reader = new BufferedReader(new FileReader
(path));
new ParserDelegator().parse(reader, new CallbackHandler(), true);
catch (IOException ioe) {
System.out.println("IOE: " + ioe);
JOptionPane.showMessageDialog(null, "Load Bookmarks",
"Unable to load bookmarks",
JOptionPane.ERROR_MESSAGE);
private static final short NO_ENTRY = 0;
private static final short BOOKMARK_ENTRY = 2;
private static final short DIRECTORY_ENTRY = 3;
private class CallbackHandler extends HTMLEditorKit.ParserCallback {
/** Parent node that new entries are added to. */
private BookmarkDirectory parent;
/** The most recently parsed tag. */
private HTML.Tag tag;
/** The last tag encountered. */
private HTML.Tag lastTag;
* The state, will be one of NO_ENTRY, DIRECTORY_ENTRY,
* or BOOKMARK_ENTRY.
private short state;
* Date for the next BookmarkDirectory node.
private Date parentDate;
* The values from the attributes are placed in here. When the
* text is encountered this is added to the node hierarchy and a
* new instance is created.
private BookmarkEntry lastBookmark;
* Creates the CallbackHandler.
public CallbackHandler() {
parent = root;
lastBookmark = new BookmarkEntry();
// HTMLEditorKit.ParserCallback methods
* Invoked when text in the html document is encountered. Based on
* the current state, this will either: do nothing
* (state == NO_ENTRY),
* create a new BookmarkEntry (state == BOOKMARK_ENTRY) or
* create a new
* BookmarkDirectory (state == DIRECTORY_ENTRY). If state is
* != NO_ENTRY, it is reset to NO_ENTRY after this is
* invoked.
public void handleText(char[] data, int pos) {
switch (state) {
case NO_ENTRY:
break;
case BOOKMARK_ENTRY:
// URL.
lastBookmark.setName(new String(data));
parent.add(lastBookmark);
lastBookmark = new BookmarkEntry();
break;
case DIRECTORY_ENTRY:
// directory.
BookmarkDirectory newParent = new
BookmarkDirectory(new String(data));
newParent.setCreated(parentDate);
parent.add(newParent);
parent = newParent;
break;
default:
break;
state = NO_ENTRY;
* Invoked when a start tag is encountered. Based on the tag
* this may update the BookmarkEntry and state, or update the
* parentDate.
public void handleStartTag(HTML.Tag t, MutableAttributeSet a,
int pos) {
lastTag = tag;
tag = t;
if (t == HTML.Tag.A && lastTag == HTML.Tag.DT) {
long lDate;
// URL
URL url;
try {
url = new URL((String)a.getAttribute(HTML.Attribute.HREF));
} catch (MalformedURLException murle) {
url = null;
lastBookmark.setLocation(url);
// created
Date date;
try {
lDate = Long.parseLong((String)a.getAttribute("add_date"));
if (lDate != 0l) {
date = new Date(1000l * lDate);
else {
date = null;
} catch (Exception ex) {
date = null;
lastBookmark.setCreated(date);
// last visited
try {
lDate = Long.parseLong((String)a.
getAttribute("last_visit"));
if (lDate != 0l) {
date = new Date(1000l * lDate);
else {
date = null;
} catch (Exception ex) {
date = null;
lastBookmark.setLastVisited(date);
state = BOOKMARK_ENTRY;
else if (t == HTML.Tag.H3 && lastTag == HTML.Tag.DT) {
// new node.
try {
parentDate = new Date(1000l * Long.parseLong((String)a.
getAttribute("add_date")));
} catch (Exception ex) {
parentDate = null;
state = DIRECTORY_ENTRY;
* Invoked when the end of a tag is encountered. If the tag is
* a DL, this will set the node that parents are added to the current
* nodes parent.
public void handleEndTag(HTML.Tag t, int pos) {
if (t == HTML.Tag.DL && parent != null) {
parent = (BookmarkDirectory)parent.getParent();
public static class BookmarkDirectory extends DefaultMutableTreeNode {
/** Dates created. */
private Date created;
public BookmarkDirectory(String name) {
super(name);
public void setName(String name) {
setUserObject(name);
public String getName() {
return (String)getUserObject();
public void setCreated(Date date) {
this.created = date;
public Date getCreated() {
return created;
public static class BookmarkEntry extends DefaultMutableTreeNode {
/** User description of the string. */
private String name;
/** The URL the bookmark represents. */
private URL location;
/** Dates the URL was last visited. */
private Date lastVisited;
/** Date the URL was created. */
private Date created;
public void setName(String name) {
this.name = name;
public String getName() {
return name;
public void setLocation(URL location) {
this.location = location;
public URL getLocation() {
return location;
public void setLastVisited(Date date) {
lastVisited = date;
public Date getLastVisited() {
return lastVisited;
public void setCreated(Date date) {
this.created = date;
public Date getCreated() {
return created;
public String toString() {
return getName();
// Bookmarks.java END
// BookmarksModel.java BEGIN
import java.util.Date;
public class BookmarksModel extends DynamicTreeTableModel {
* Names of the columns.
private static final String[] columnNames =
{ "Name", "Location", "Last Visited", "Created" };
* Method names used to access the data to display.
private static final String[] methodNames =
{ "getName", "getLocation", "getLastVisited","getCreated" };
* Method names used to set the data.
private static final String[] setterMethodNames =
{ "setName", "setLocation", "setLastVisited","setCreated" };
private static final Class[] classes =
{ TreeTableModel.class, String.class, Date.class, Date.class };
public BookmarksModel(Bookmarks.BookmarkDirectory root) {
super(root, columnNames, methodNames, setterMethodNames, classes);
public boolean isCellEditable(Object node, int column) {
switch (column) {
case 0:
// Allow editing of the name, as long as not the root.
return (node != getRoot());
case 1:
// Allow editing of the location, as long as not a
// directory
return (node instanceof Bookmarks.BookmarkEntry);
default:
// Don't allow editing of the date fields.
return false;
// BookmarksModel.java END
// DynamicTreeTableModel.java BEGIN
import java.lang.reflect.*;
import javax.swing.tree.*;
public class DynamicTreeTableModel extends AbstractTreeTableModel {
/** Names of the columns, used for the TableModel getColumnName method. */
private String[] columnNames;
private String[] methodNames;
private String[] setterMethodNames;
/** Column classes, used for the TableModel method getColumnClass. */
private Class[] cTypes;
public DynamicTreeTableModel(TreeNode root, String[] columnNames,
String[] getterMethodNames,
String[] setterMethodNames,
Class[] cTypes) {
super(root);
this.columnNames = columnNames;
this.methodNames = getterMethodNames;
this.setterMethodNames = setterMethodNames;
this.cTypes = cTypes;
public int getChildCount(Object node) {
return ((TreeNode)node).getChildCount();
public Object getChild(Object node, int i) {
return ((TreeNode)node).getChildAt(i);
public boolean isLeaf(Object node) {
return ((TreeNode)node).isLeaf();
public int getColumnCount() {
return columnNames.length;
public String getColumnName(int column) {
if (cTypes == null || column < 0 || column >= cTypes.length) {
return null;
return columnNames[column];
public Class getColumnClass(int column) {
if (cTypes == null || column < 0 || column >= cTypes.length) {
return null;
return cTypes[column];
public Object getValueAt(Object node, int column) {
try {
Method method = node.getClass().getMethod(methodNames[column],
null);
if (method != null) {
return method.invoke(node, null);
catch (Throwable th) {}
return null;
* Returns true if there is a setter method name for column
* <code>column</code>. This is set in the constructor.
public boolean isCellEditable(Object node, int column) {
return (setterMethodNames != null &&
setterMethodNames[column] != null);
// Note: This looks up the methods each time! This is rather inefficient;
// it should really be changed to cache matching
// methods/constructors
// based on <code>node</code>'s class, and code>aValue</code>'s
//class.
public void setValueAt(Object aValue, Object node, int column) {
boolean found = false;
try {
// We have to search through all the methods since the
// types may not match up.
Method[] methods = node.getClass().getMethods();
for (int counter = methods.length - 1; counter >= 0; counter--) {
if (methods[counter].getName().equals
(setterMethodNames[column]) && methods[counter].
getParameterTypes() != null && methods[counter].
getParameterTypes().length == 1) {
// We found a matching method
Class param = methods[counter].getParameterTypes()[0];
if (!param.isInstance(aValue)) {
// Yes, we can use the value passed in directly,
// no coercision is necessary!
if (aValue instanceof String &&
((String)aValue).length() == 0) {
// Assume an empty string is null, this is
// probably bogus for here.
aValue = null;
else {
// Have to attempt some sort of coercision.
// See if the expected parameter type has
// a constructor that takes a String.
Constructor cs = param.getConstructor
(new Class[] { String.class });
if (cs != null) {
aValue = cs.newInstance(new Object[]
{ aValue });
else {
aValue = null;
// null either means it was an empty string, or there
// was no translation. Could potentially deal with these
// differently.
methods[counter].invoke(node, new Object[] { aValue });
found = true;
break;
} catch (Throwable th) {
System.out.println("exception: " + th);
if (found) {
// The value changed, fire an event to notify listeners.
TreeNode parent = ((TreeNode)node).getParent();
fireTreeNodesChanged(this, getPathToRoot(parent),
new int[] { getIndexOfChild(parent, node) },
new Object[] { node });
public TreeNode[] getPathToRoot(TreeNode aNode) {
return getPathToRoot(aNode, 0);
private TreeNode[] getPathToRoot(TreeNode aNode, int depth) {
TreeNode[] retNodes;
// This method recurses, traversing towards the root in order
// size the array. On the way back, it fills in the nodes,
// starting from the root and working back to the original node.
/* Check for null, in case someone passed in a null node, or
they passed in an element that isn't rooted at root. */
if(aNode == null) {
if(depth == 0)
return null;
else
retNodes = new TreeNode[depth];
else {
depth++;
if(aNode == root)
retNodes = new TreeNode[depth];
else
retNodes = getPathToRoot(aNode.getParent(), depth);
retNodes[retNodes.length - depth] = aNode;
return retNodes;
// DynamicTreeTableModel.java END
// IconRenderer.java BEGIN
import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.plaf.basic.BasicTreeUI;
class IconRenderer extends DefaultTreeCellRenderer
// Color backColor = new Color(0xD0, 0xCC, 0xFF);
Color backColor = new Color(0xF0, 0xF0, 0xE0);
String tipText = "";
JTree tree;
int currRow = 0;
boolean m_selected;
JTable table;
public IconRenderer(JTree tree, JTable table) {
this.table = table;
// setBackground(backColor);
setBackground(Color.GREEN);
setForeground(Color.black);
this.tree = tree;
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean selected,
boolean expanded, boolean leaf,
int row, boolean hasFocus) {
Object node = null;
super.getTreeCellRendererComponent(
tree, value, selected,
expanded, leaf, row,
hasFocus);
TreePath treePath = tree.getPathForRow(row);
if(treePath != null)
node = treePath.getLastPathComponent();
currRow = row;
m_selected = selected;
DefaultMutableTreeNode itc = null;
if (node instanceof DefaultMutableTreeNode) {
itc = (DefaultMutableTreeNode)node;
setClosedIcon(closedIcon);
setOpenIcon(openIcon);
return this;
/* Override the default to send back different strings for folders and leaves. */
public String getToolTipText() {
return tipText;
* Paints the value. The background is filled based on selected.
public void paint(Graphics g) {
super.paint(g);
Color bColor = null;
if(!m_selected) {
System.out.println(" iconren not sel currRow " + currRow);
if(currRow % 2 == 0) {
bColor = Color.WHITE;
} else {
bColor = backColor;
} else {
bColor = table.getSelectionBackground();
System.out.println("in else selbg = " + bColor);
bColor = new Color(0xF0, 0xCC, 0x92);
System.out.println(" bColor aft = " + bColor);
int imageOffset = -1;
if(bColor != null) {
imageOffset = getLabelStart();
g.setColor(bColor);
if(!m_selected) {
System.out.println(" not sel setting white ");
g.setXORMode(new Color(0xFF, 0xFF, 0xFF));
} else {
// g.setXORMode(new Color(0xCC, 0xCC, 0x9F));
g.setXORMode(new Color(0x00, 0x00, 0x00));
System.out.println(" using color = " + g.getColor());
if(getComponentOrientation().isLeftToRight()) {
g.fillRect(imageOffset, 0, getWidth() - 1 - imageOffset,
getHeight());
} else {
g.fillRect(0, 0, getWidth() - 1 - imageOffset,
getHeight());
private int getLabelStart() {
Icon currentI = getIcon();
if(currentI != null && getText() != null) {
return currentI.getIconWidth() + Math.max(0, getIconTextGap() - 1);
return 0;
// IconRenderer.java END
// IndicatorRenderer.java BEGIN
// import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import javax.swing.table.*;
import javax.swing.table.*;
import javax.swing.plaf.basic.*;
import java.awt.event.*;
import java.util.EventObject;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.StringTokenizer;
import java.util.Arrays;
class IndicatorRenderer extends DefaultTableCellRenderer {
/** Makes sure the number of displayed in an internationalized
* manner. */
protected NumberFormat formatter;
/** Row that is currently being painted. */
protected int lastRow;
protected int reloadRow;
protected int reloadCounter;
protected TreeTableModel treeTableModel;
protected TreeTableModelAdapter treeTblAdapter;
protected JTable table;
Component renderer = null;
Color backColor = new Color(0xF0, 0xF0, 0xE0);
IndicatorRenderer(TreeTableModelAdapter treeTblAdapter, TreeTableModel treeTableModel) {
setHorizontalAlignment(JLabel.RIGHT);
setFont(new Font("serif", Font.BOLD, 12));
this.treeTableModel = treeTableModel;
this.treeTblAdapter = treeTblAdapter;
* Invoked as part of DefaultTableCellRenderers implemention. Sets
* the text of the label.
public void setValue(Object value) {
/* setText((value == null) ? "---" : formatter.format(value)); */
setText((value == null) ? "---" : (String) value.toString());
* Returns this.
public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
renderer = super.getTableCellRendererComponent(table, value, isSelected,
hasFocus, row, column);
lastRow = row;
this.table = table;
if(isSelected) {
doMask(hasFocus, isSelected);
} else
setBackground(table.getBackground());
return renderer;
* If the row being painted is also being reloaded this will draw
* a little indicator.
public void paint(Graphics g) {
super.paint(g);
private void doMask(boolean hasFocus, boolean selected) {
maskBackground(hasFocus, selected);
private void maskBackground(boolean hasFocus, boolean selected) {
Color seed = null;
seed = table.getSelectionBackground();
Color color = seed;
if (color != null) {
setBackground(
new Color(0xF0, 0xCC, 0x92));
// IndicatorRenderer.java END
// JTreeTable.java BEGIN
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import javax.swing.table.*;
import java.awt.event.*;
import java.util.EventObject;
public class JTreeTable extends JTable {
/** A subclass of JTree. */
protected TreeTableCellRenderer tree;
protected IndicatorRenderer indicatorRenderer = null;
public JTreeTable(TreeTableModel treeTableModel) {
super();
// Creates the tree. It will be used as a renderer and editor.
tree = new TreeTableCellRenderer(treeTableModel);
TreeTableModelAdapter tdap = new TreeTableModelAdapter(treeTableModel, tree);
// Installs a tableModel representing the visible rows in the tree.
super.setModel(tdap);
// Forces the JTable and JTree to share their row selection models.
ListToTreeSelectionModelWrapper selectionWrapper = new
ListToTreeSelectionModelWrapper();
tree.setSelectionModel(selectionWrapper);
setSelectionModel(selectionWrapper.getListSelectionModel());
// Installs the tree editor renderer and editor.
setDefaultRenderer(TreeTableModel.class, tree);
setDefaultEditor(TreeTableModel.class, new TreeTableCellEditor());
indicatorRenderer = new IndicatorRenderer(tdap, treeTableModel);
// No grid.
setShowGrid(false);
// No intercell spacing
setIntercellSpacing(new Dimension(0, 0));
// And update the height of the trees row to match that of
// the table.
//if (tree.getRowHeight() < 1) {
// Metal looks better like this.
setRowHeight(20);
public TableCellRenderer getCellRenderer(int row, int col) {
if(col == 0)
return tree;
else
return indicatorRenderer;
public void updateUI() {
super.updateUI();
if(tree != null) {
tree.updateUI();
// Do this so that the editor is referencing the current renderer
// from the tree. The renderer can potentially change each time
// laf changes.
setDefaultEditor(TreeTableModel.class, new TreeTableCellEditor());
// Use the tree's default foreground and background colors in the
// table.
LookAndFeel.installColorsAndFont(this, "Tree.background",
"Tree.foreground", "Tree.font");
public int getEditingRow() {
return (getColumnClass(editingColumn) == TreeTableModel.class) ? -1 :
editingRow;
private int realEditingRow() {
return editingRow;
public void sizeColumnsToFit(int resizingColumn) {
super.sizeColumnsToFit(resizingColumn);
if (getEditingColumn() != -1 && getColumnClass(editingColumn) ==
TreeTableModel.class) {
Rectangle cellRect = getCellRect(realEditingRow(),
getEditingColumn(), false);
Component component = getEditorComponent();
component.setBounds(cellRect);
component.validate();
public void setRowHeight(int rowHeight) {
super.setRowHeight(rowHeight);
if (tree != null && tree.getRowHeight() != rowHeight) {
tree.setRowHeight(getRowHeight());
public JTree getTree() {
return tree;
public boolean editCellAt(int row, int column, EventObject e){
boolean retValue = super.editCellAt(row, column, e);
if (retValue && getColumnClass(column) == TreeTableModel.class) {
repaint(getCellRect(row, column, false));
return retValue;
public class TreeTableCellRenderer extends JTree implements
TableCellRenderer {
/** Last table/tree row asked to renderer. */
protected int visibleRow;
/** Border to draw around the tree, if this is non-null, it will
* be painted. */
protected Border highlightBorder;
public TreeTableCellRenderer(Tr -
Changing the Datasource of example CMP from Weblogic
I got an error message while running a successfully (?) deployed
Weblogic example bea\weblogic700\samples\server\src\examples\ejb20\basic\containerManaged.
The error message is like this when I run the "ant run":
run:
[java]
[java] Beginning containerManaged.Client...
[java]
[java] The client was unable to lookup the EJBHome. Please make
sure that you have deployed the ejb with the JNDI name
ejb20-containerManaged-AccountHome
on the WebLogic server at t3://localhost:7001
[java] Unable to look up the beans home: Unable to resolve
'ejb20-containerManaged-AccountHome' Resolved: ''
Unresolved:'ejb20-containerManaged-AccountHome
BUILD FAILED
D:\bea\weblogic700\samples\server\src\examples\ejb20\basic\containerManaged\build.xml:121:
Java returned: 1
The ConnectionPool and DataSource have been set through the Weblogic
Console.
Such that
Name: MySQLConnectionPool
URL: jdbc:mysql://localhost:3306/MyDatabase
Driver: Classname com.mysql.jdbc.Driver
Properties: user=sa
password=
Name: MySQLTxDataSource
JNDI Name: MySQLTxDataSource
Pool Name: MySQLConnectionPool
Then I modified the weblogic-cmp-rdbms-jar.xml, such that
<!-- the following line actually should be the JNDI name -->
<!-- data-source-name>examples-dataSource-demoPool</data-source-name
-->
<data-source-name>MySQLTxDataSource</data-source-name>
Then I got the above error. If I change the DataSource back to
examples-dataSource-demoPool. Everything works fine.
I could not find where the problem is. Could anyone give me a clue.
Thanks
Ruiwu TaoPlease re-post if this is still an issue but first update to CR4E 2 and retest
-
How to generate PDF report directly instead of RPT report by using JRC ?
Hi,
Good Day !
How to generate PDF report directly instead of RPT report by using Crystal Reports XI Release 2 Java Reporting Component (JRC) in desktop (Swing thick-client) ?
My GUI program will generate a RPT report, then i can export to PDF file, this is ok, no problem.
BUT
i want it direct to generate a PDF report, not a RPT report.
The code like below (2 java files)
ClassA.java
ReportClientDocument reportClientDoc = new ReportClientDocument();
reportClientDoc.open(XXX, 0);
ParameterFieldController paramFieldController = reportClientDoc.getDataDefController().getParameterFieldController();
paramFieldController.setCurrentValue("", "XXX", DomainClass.getXXX());
new ReportViewerFrame(reportClientDoc);
// End of ClassA.java
// Begin ReportViewerFrame.java
public class ReportViewerFrame extends JFrame
//Initial window frame properties.
private final int XPOS = 80;
private final int YPOS = 60;
private final int WIDTH = 760;
private final int HEIGHT = 550;
private ReportViewerBean reportViewer = new ReportViewerBean();
private ReportClientDocument reportClientDoc = new ReportClientDocument();
public ReportViewerFrame(ReportClientDocument reportClientDoc) throws Exception
//Initialize frame properties.
this.setResizable(true);
this.setLocation(XPOS, YPOS);
this.setSize(WIDTH, HEIGHT);
this.setTitle("Crystal Report Java Viewer");
//Add GUI components to the frame including the ReportViewerBean.
addComponents();
//Add GUI listeners to the frame.
addListeners();
//Set the report that the ReportViewerBean will display.
this.reportClientDoc = reportClientDoc;
reportViewer.setReportSource(reportClientDoc.getReportSource());
reportViewer.init();
reportViewer.start();
//Display the frame.
this.setVisible(true);
How to set the export option to PDF base on existing code ?
Where can i download this package/jar ?
regardsPlease find a console app that you can extend it to a JFrame app by importing the relevant swing package:
//Crystal Java Reporting Component (JRC) imports.
import com.crystaldecisions.reports.sdk.*;
import com.crystaldecisions.sdk.occa.report.lib.*;
import com.crystaldecisions.sdk.occa.report.exportoptions.*;
//Java imports.
import java.io.*;
public class ExportReport {
static final String REPORT_NAME = "ExportReport.rpt";
static final String EXPORT_FILE = "C:\\myExportedReport.pdf";
public static void main(String[] args) {
try {
//Open report.
ReportClientDocument reportClientDoc = new ReportClientDocument();
reportClientDoc.open(REPORT_NAME, 0);
//NOTE: If parameters or database login credentials are required, they need to be set before.
//calling the export() method of the PrintOutputController.
//Export report and obtain an input stream that can be written to disk.
//See the Java Reporting Component Developer's Guide for more information on the supported export format enumerations
//possible with the JRC.
ByteArrayInputStream byteArrayInputStream = (ByteArrayInputStream)reportClientDoc.getPrintOutputController().export(ReportExportFormat.PDF);
//Release report.
reportClientDoc.close();
//Use the Java I/O libraries to write the exported content to the file system.
byte byteArray[] = new byte[byteArrayInputStream.available()];
//Create a new file that will contain the exported result.
File file = new File(EXPORT_FILE);
FileOutputStream fileOutputStream = new FileOutputStream(file);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(byteArrayInputStream.available());
int x = byteArrayInputStream.read(byteArray, 0, byteArrayInputStream.available());
byteArrayOutputStream.write(byteArray, 0, x);
byteArrayOutputStream.writeTo(fileOutputStream);
//Close streams.
byteArrayInputStream.close();
byteArrayOutputStream.close();
fileOutputStream.close();
System.out.println("Successfully exported report to " + EXPORT_FILE);
catch(ReportSDKException ex) {
ex.printStackTrace();
catch(Exception ex) {
ex.printStackTrace();
As to the relevant jar(s) deployment refer to this link (Java Reporting Component Configuration):
http://devlibrary.businessobjects.com/BusinessObjectsXIR2SP2/en/en/JRC_SDK/jrc_java_dg_doc/doc/jrcsdk_java_dg/WorkingWithJRC2.html#1004391
Cheers -
Hello!
If and when will the UI elements FormattedTextView and FormattedTextEdit be available in Web Dynpro for Java 7.0?
I have played around with them in NWCE 7.1 and I have seen documentation for them in WDP Abap NW04s, but I cant find the ui elements in NW 7.0 ehp1.
Thanks in advance!
PS.
Here is the documentation for NWCE 7.1:
http://help.sap.com/saphelp_nwce711/helpdata/en/44/4f68fb6fc30a65e10000000a422035/frameset.htm
Edited by: Richard Linnander on Jul 7, 2009 9:24 AMAccording to my investigation FormattedTextView/Edit contols are available in WebDynpro for Java beginning from release 7.0 EHP1. See https://cw.sdn.sap.com/cw/docs/DOC-15696
I tested 7.0 SP23 and FormattedTextView/Edit was not available. -
Raising exceptions on hanging or failing updates
I have inherited a storeprocedure of around 400 lines of code wgich contains multiple SQL blocks of a update selection wrapped round a select statement.
This store procedure works on dbA but not on dbB on dbA. it just hangs.
dbA has more data, so it looks as if one of the combined update selects is failing. What I would like to do is encase the updates in a exception block so that is there is a problem in updating the table the exception will end the program with a suitable error message.
All the examples I have seen are for IF then blocks.
what I want is something similar to the java try and catch
exception block starts
update table1 set var1 =
(select var2 from table2 where var2 =3);
catch the exception
output a message.
is this possible.
Thanks for any help TonyPL/SQL has exception blocks like Java
BEGIN
UPDATE table1
SET var1 = (SELECT var2
FROM table2
WHERE var2 =3);
EXCEPTION
WHEN OTHERS
THEN
<<handle exception>>
END;There is a chapter in the PL/SQL Programmer's Guide on handling PL/SQL errors http://download-west.oracle.com/docs/cd/B10501_01/appdev.920/a96624/07_errs.htm#707 that covers your option in more detail. For example, this exception block catches every exception-- you can catch specific exceptions and handle them differently as well.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC -
WHEN-TREE-NODE-SELECTED want to return parent_id ?
Hello all,
In WHEN-TREE-NODE-SELECTED Trigger
i want to return the parent_id from the database
i have already returned the pk as follows:
DECLARE
pk INSP_EQUIPMENT.EQUIPMENT_ID%TYPE;
PARENT_PK INSP_EQUIPMENT.PARENT_ID%TYPE;
BEGIN
IF :SYSTEM.TRIGGER_NODE_SELECTED = 'TRUE' THEN --node selected
pk := ftree.get_tree_node_property(
'TREE_BLOCK_TEST.TREE13',
:system.trigger_node,
ftree.node_value);
message('pk: '||pk); -- works fine
message('pk: '||pk);
{code}<br /><br /><br /><br />The Questiuoin is how could i returned the parent_id <br /><br />i used the same code as follows:<br /><br /><br /><br /><br /><br />{code:java}
BEGIN
IF :SYSTEM.TRIGGER_NODE_SELECTED = 'TRUE' THEN --node selected
PARENT_PK := ftree.get_tree_node_property(
'TREE_BLOCK_TEST.TREE13',
:system.trigger_node,
ftree.node_value);
message('PARENT_PK : '||PARENT_PK ); -- works Wrond it returns the same pk
message('PARENT_PK : '||PARENT_PK );
{code}<br /><br /><br /><br /><br /><br />i tried also tried <br /><br /><br /><br />{code:java}
PARENT_PK := ftree.Get_Tree_Node_Parent(
'TREE_BLOCK_TEST.TREE13'
ftree.node_value);
message('PARENT_PK: '||PARENT_PK); -- returns rubbish number
message('PARENT_PK: '||PARENT_PK);
{code}<br /><br /><br /><br />Quick Help will be appreciated..<br /><br /><br /><br />Regards,<br /><br /><br /><br />Abdetu..Thanks Tony for reply,
Getting the folowing error:
FRM-47307: Cannot get the properties of the tree root node.Cause: GET_TREE_NODE_PARENT or GET_TREE_NODE_PROPERTY attempted to obtain information from the root node.
Action: Only invoke the built-ins against valid nodes.
Level: 99
Type: ErrorRegards,
Abdetu..
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