I am trying to compile an example class that imports a lot

of classes. These classes are contained in a jar file. I think i need to set the class path correctly. I am using eclipse as the IDE. How do i set the class path in my project?

Right click your project: select properties.
From the menu on the left select "Java Build Path"
Click on the "Libraries" tab
Add external Jar

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"Symbol Undefined" error when trying to compile GPIB examples

I'm trying to compile the examples written in C that are given in the folder \VXIPNP\WinNT\NIvisa\Examples\C\Gpib. Using a standard ANSI C compiler, I get the following error messages:
AsyncIO.obj(AsyncIO)
Error 42: Symbol Undefined _viClose@4
AsyncIO.obj(AsyncIO)
Error 42: Symbol Undefined _viTerminate@12
AsyncIO.obj(AsyncIO)
Error 42: Symbol Undefined _viReadAsync@16
AsyncIO.obj(AsyncIO)
Error 42: Symbol Undefined _viWrite@16
AsyncIO.obj(AsyncIO)
Error 42: Symbol Undefined _viEnableEvent@16
AsyncIO.obj(AsyncIO)
Error 42: Symbol Undefined _viInstallHandler@16
AsyncIO.obj(AsyncIO)
Error 42: Symbol Undefined _viOpen@20
AsyncIO.obj(AsyncIO)
Error 42: Symbol Undefined _viOpenDefaultRM@
4
AsyncIO.obj(AsyncIO)
Error 42: Symbol Undefined _viGetAttribute@12
--- errorlevel 9
Any help is appreciated.

Hi esi_stents,
The compiler is complaining here because it can't find the correct library file to link to. Therefore, each of the above errors are function calls that the compiler does not have a prototype for.
The library file you want to make sure to link to is visa32.lib. The path for this library file differs slightly based on what compiler you are using:
Borland: C:\VXIPNP\WinNT\lib\bc
Microsoft: C:\VXIPNP\WinNT\lib\msc
Then follow the instructions for your compiler on how to set up links to a library.
Now the compiler should stop complaining at you and you're good to go! Have fun!
Kileen Cheng
Applications Engineer
National Instruments

Example class that implements Serializable interface

Dear,
I have a class myData that I want to implement Serializable interface. class myData has only two fields: Integer iData1, String sData2.
Could anybody shown me how my myData class should be?
Thanks a lot!

Hey, if you have yet to obtain a remote reference from the app server ...then we are into pandora's box. I lost three whole heads of hair getting up on JBoss when I first started. You want to check out the JBoss forums on the JBoss website, and the enterprise javabeans forum here. Search some posts and read the free JBoss manual.
Unfortunately, there isn't a 'here, do this' solution to getting connected with JBoss. There are quite a few gotcha's. There are descriptors, descriptor syntax ...and this changes between releases so there seems to be alot of people saying 'here, do this' ...but you try and it doesn't work (wrong release). Here are some descriptors that I threw up recently for someone ...a place to start.
http://forum.java.sun.com/thread.jsp?forum=13&thread=414432
This drove me nuts until it all worked right. I was stuck for three weeks at one point ...ready to give up, but then I got it. Perservere ...its a nice container for learning in (its free!).
I will try and watch for you.
Oh, and put something in your head ...at least then you will keep your hair !
:)

Preverify error when netbean 4.0 build classes that import device lib

ERROR: native methods should not appear
Error preverifying class com.sprintpcs.media.Clip

Hi,
BPEL and BPEL PM do not have a good support for SOAPENC-Array: it would be very difficult to create such an array in BPEL or to receive it and manipulate it.
The (unfortunately very intrusive) work around is to change the WSDL of the service to use a XML type defined using XML schema. This is all the more painful that JDev 9.0.4 does not have strong support for complex types.
In general though, I would highly recommend this best practice:
1) Start by define the WSDL contract first
2) Then generate the server side skeleton to implement it
3) Use BPEL as the client to this contract.
By starting with the contract first, you make sure that 1) your interfaces are clean and coarse grained.
2) things like java objects, sessions, etc to not leak through the interface (which would be the worst thing that could happen because it would closely link the client and the server.
Sorry for not being more helpful. This will get radically cleaner in Oracle AS 10.1.3.
Edwin

Getting error message Cannot Resolve Symbol when trying to compile a class

Hello All -
I am getting an error message cannot resolve symbol while trying to compile a java class that calls another java class in the same package. The called class compiles fine, but the calling class generates
the following error message:
D:\Apache Tomcat 4.0\webapps\examples\WEB-INF\classes\cal>javac
ConnectionPool.java
ConnectionPool.java:158: cannot resolve symbol
symbol : class PooledConnection
location: class cal.ConnectionPool
private void addConnection(PooledConnection value) {
^
ConnectionPool.java:144: cannot resolve symbol
symbol : class PooledConnection
location: class cal.ConnectionPool
PooledConnection pcon = new PooledConnection(con);
^
ConnectionPool.java:144: cannot resolve symbol
symbol : class PooledConnection
location: class cal.ConnectionPool
PooledConnection pcon = new PooledConnection(con);
The code is listed as follows for PooledConnection.java (it compiles fine)
package cal;
import java.sql.*;
public class PooledConnection {
// Real JDBC Connection
private Connection connection = null;
// boolean flag used to determine if connection is in use
private boolean inuse = false;
// Constructor that takes the passed in JDBC Connection
// and stores it in the connection attribute.
public PooledConnection(Connection value) {
if ( value != null ) {
connection = value;
// Returns a reference to the JDBC Connection
public Connection getConnection() {
// get the JDBC Connection
return connection;
// Set the status of the PooledConnection.
public void setInUse(boolean value) {
inuse = value;
// Returns the current status of the PooledConnection.
public boolean inUse() {
return inuse;
// Close the real JDBC Connection
public void close() {
try {
connection.close();
catch (SQLException sqle) {
System.err.println(sqle.getMessage());
Now the code for ConnectionPool.java class that gives the cannot
resolve symbol error
package cal;
import java.sql.*;
import java.util.*;
public class ConnectionPool {
// JDBC Driver Name
private String driver = null;
// URL of database
private String url = null;
// Initial number of connections.
private int size = 0;
// Username
private String username = new String("");
// Password
private String password = new String("");
// Vector of JDBC Connections
private Vector pool = null;
public ConnectionPool() {
// Set the value of the JDBC Driver
public void setDriver(String value) {
if ( value != null ) {
driver = value;
// Get the value of the JDBC Driver
public String getDriver() {
return driver;
// Set the URL Pointing to the Datasource
public void setURL(String value ) {
if ( value != null ) {
url = value;
// Get the URL Pointing to the Datasource
public String getURL() {
return url;
// Set the initial number of connections
public void setSize(int value) {
if ( value > 1 ) {
size = value;
// Get the initial number of connections
public int getSize() {
return size;
// Set the username
public void setUsername(String value) {
if ( value != null ) {
username = value;
// Get the username
public String getUserName() {
return username;
// Set the password
public void setPassword(String value) {
if ( value != null ) {
password = value;
// Get the password
public String getPassword() {
return password;
// Creates and returns a connection
private Connection createConnection() throws Exception {
Connection con = null;
// Create a Connection
con = DriverManager.getConnection(url,
username, password);
return con;
// Initialize the pool
public synchronized void initializePool() throws Exception {
// Check our initial values
if ( driver == null ) {
throw new Exception("No Driver Name Specified!");
if ( url == null ) {
throw new Exception("No URL Specified!");
if ( size < 1 ) {
throw new Exception("Pool size is less than 1!");
// Create the Connections
try {
// Load the Driver class file
Class.forName(driver);
// Create Connections based on the size member
for ( int x = 0; x < size; x++ ) {
Connection con = createConnection();
if ( con != null ) {
// Create a PooledConnection to encapsulate the
// real JDBC Connection
PooledConnection pcon = new PooledConnection(con);
// Add the Connection to the pool.
addConnection(pcon);
catch (Exception e) {
System.err.println(e.getMessage());
throw new Exception(e.getMessage());
// Adds the PooledConnection to the pool
private void addConnection(PooledConnection value) {
// If the pool is null, create a new vector
// with the initial size of "size"
if ( pool == null ) {
pool = new Vector(size);
// Add the PooledConnection Object to the vector
pool.addElement(value);
public synchronized void releaseConnection(Connection con) {
// find the PooledConnection Object
for ( int x = 0; x < pool.size(); x++ ) {
PooledConnection pcon =
(PooledConnection)pool.elementAt(x);
// Check for correct Connection
if ( pcon.getConnection() == con ) {
System.err.println("Releasing Connection " + x);
// Set its inuse attribute to false, which
// releases it for use
pcon.setInUse(false);
break;
// Find an available connection
public synchronized Connection getConnection()
throws Exception {
PooledConnection pcon = null;
// find a connection not in use
for ( int x = 0; x < pool.size(); x++ ) {
pcon = (PooledConnection)pool.elementAt(x);
// Check to see if the Connection is in use
if ( pcon.inUse() == false ) {
// Mark it as in use
pcon.setInUse(true);
// return the JDBC Connection stored in the
// PooledConnection object
return pcon.getConnection();
// Could not find a free connection,
// create and add a new one
try {
// Create a new JDBC Connection
Connection con = createConnection();
// Create a new PooledConnection, passing it the JDBC
// Connection
pcon = new PooledConnection(con);
// Mark the connection as in use
pcon.setInUse(true);
// Add the new PooledConnection object to the pool
pool.addElement(pcon);
catch (Exception e) {
System.err.println(e.getMessage());
throw new Exception(e.getMessage());
// return the new Connection
return pcon.getConnection();
// When shutting down the pool, you need to first empty it.
public synchronized void emptyPool() {
// Iterate over the entire pool closing the
// JDBC Connections.
for ( int x = 0; x < pool.size(); x++ ) {
System.err.println("Closing JDBC Connection " + x);
PooledConnection pcon =
(PooledConnection)pool.elementAt(x);
// If the PooledConnection is not in use, close it
if ( pcon.inUse() == false ) {
pcon.close();
else {
// If it is still in use, sleep for 30 seconds and
// force close.
try {
java.lang.Thread.sleep(30000);
pcon.close();
catch (InterruptedException ie) {
System.err.println(ie.getMessage());
I am using Sun JDK Version 1.3.0_02" and Apache/Tomcat 4.0. Both the calling and the called class are in the same directory.
Any help would be greatly appreciated.
tnx..
addi

Is ConnectionPool in this "cal" package as well as PooledConnection? From the directory you are compiling from it appears that it is. If it is, then you are compiling it incorrectly. To compile ConnectionPool (and PooledConnection similarly), you must change the current directory to the one that contains cal and type
javac cal/ConnectionPool.

I can' t compile Stratus example from Adobe sample...

Hey guys !
First, please sorry for my bad english, I'm french and it's a pain to explain this kind of problem in foreign language...
I 'm trying to compile the example code found in Stratus sample (the audio/video chat), but I think some package are missed because Flex found a lot of error. Flex tell me that I'm trying to use some class or properties that doesn't exist...
Here the list of the missing elements :
- NetStreamInfo
- Microphone.codec
- NetStream.DIRECT_CONNECTIONS
- Microphone.encodeQuality
- NetStream.farId
- Microphone.framesPerPacket
- NetStream.info
- NetConnection.nearId
- NetStream.peerStream
- SoundCodec
I 'm using Flex Builder 3.02 (downloaded from the link at the bottom of the stratus' presentation page).I have my Stratus Key, but the problem is not here because I'm unable to launch the compilation...
Where can I find the class / package I need ?
In other terms, how can I compile the stratus example with no error.
Thanks a lot !

you probably forgot to set the minimum Flash Player version to 10.0.0 in the Flex build settings. open the Properties for your Flex project, go to the "Flex Compiler" property, and in the "HTML wrapper" section's "Require Flash Player version" enter 10.0.0 in the boxes. that will enable the compiler to recognize Flash Player 10 APIs.
-mike

Compiling java package class referring a default package class.

I am trying to compile a java class having a package defination referring a java class with a default package.
The code for the default package class is .
public class Test{.
public static void main(String[] args){
System.out.println("Hello World!");
This class compiles fine.
I have another class called PackJava, whose code is :
package test;
import Test;
public class PackJava{
public static void main(String[] args){
Test test = new Test();
System.out.println("Hello World!");
I have Test file in the windows path
D:\development\packagetest\example
and the PackJava java file in the path
D:\development\packagetest\example\test
I have set the CLASSPATH environment varibale as
D:\development\packagetest\example;.
When I try to compile the PackJava from the
D:\development\packagetest\example path giving the command as
javac -classpath . test\PackJava.java
or
javac -classpath %CLASSPATH% test\PackJava.java
it gives me error,
Do any of you have an idea of the parameter i should pass
to the -classpath option
Thanks

There is a way around all this. The classes in the default packages need to implement an interface with the methods require. The interface can be in any package you want ie. com.work.around.interf.MyInterface1. Next, make this interface available in a Singleton. - The only catch here is that, the main method must reside in default package as well. And o, on start of main, instantiate the class you want and put it in the singleton. There after, you may refer to it from the singleton.
Enjoy.

Workshop error during compilation of Java class

Hi,
I am starting to use Workshop for development. I am getting the following error when I start the debugger.
I am trying to compile a Java class and don't know how to proceed. Any help is appreciated.
build:
Deleting directory C:\DOCUME~1\name\LOCALS~1\Temp\wlw-temp-23835\wlw_compile55184
Created dir: C:\DOCUME~1\name\LOCALS~1\Temp\wlw-temp-23835\wlw_compile55184
C:\bea\user_projects\applications\CVXMLBeansApplication\CVXMLBeansClient\
ERROR: XMLBeansClient.java:12: The package of this type does not match its location on the source path: .
ERROR: 1 error(s), 0 warning(s).
BUILD FAILED
ERROR: Errors found.

I found the answer nested in the documentation. I had to create folders that mirror the package structure and then place the source file in its appropriate folder.

Trying to compile bean...

Hi I'm having some difficulty here when compiling some bean code into a class.
My SDK is located at C:\j2sdk1.4.0
I'm calling javac from the dirctory of the bean code: C:\jakarta...\webapps\frank\WEB-INF\classes\
I'm getting errors that say:
javax.servlet.http does not exist
import javax.servlet.http.HttpServletRequest;
^
When trying to compile the following bean code:
import java.io.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletInputStream;
public class SimpleBean {
public void doUpload(HttpServletRequest request) throws
IOException {
PrintWriter pw = new PrintWriter(
new BufferedWriter(new FileWriter("Demo.out")));
ServletInputStream in = request.getInputStream();
int i = in.read();
while (i != -1) {
pw.print((char) i);
i = in.read();
pw.close();
My Java home environment var is set to: C:\j2sdk1.4.0 but have nothing in my classpath. Is this the problem?
Frank

It looks like you are trying to use J2EE components such as servlets, and the JDK that you have installed is Java 2 Standard Edition JDK. You will need J2EE SDK (available for free from Sun) and a Apache Ant to build your components (go to http://jakarta.apache.org/ant/). Then you will need to configure them both (instructions on that are included in installation packages).
After you're done, you can compile the component using the "ant" command.
Hope this helps!

Error while compiling JMS example - package javax.jms does not exist

Dear All,
I am a newbie trying to use JMS. I have downloaded EE 5 SDK and installed (it contains Message Queue 4.1 as well). After the installation and going to some tutorials, I tried to compile the example 'SimpleQueueSender.java' which was downloaded from Sun website.
Before running the application, I made sure that I have set the classpath, path environment veriables correctly, but still I got the error "package javax.jms does not exist". I have searched internet for help and in all places I found people replying to similar issues. But I was not able to apply the solution as either the folder names or file names specified in the solution is different from what is existing in my system.
Please help me. Also could anyone help me in telling the pre-requisites to ensure a proper running of java application.
Thanks in Advance
Regards,
San

I'm not sure exactly what your JavaEE SDK installation contains (there are so many versions) but it will typically contain a Glassfish installation. Under the Glassfish installation, the imq directory contains all the files needed for MessageQueue.
The javax.jms package contains the JMS API interfaces. These can be found in jms.jar, which is typically in imq/lib. At runtime you will also need imq.jar from the same directory, which contains the implementation of these interfaces for MessageQueue.
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Trouble with compiling class that contains "import com.sun.xacml.*;"

I think the package com.sun.xacml is included in j2sdk 1.4.2 (the one that I have)
but every time I try to compile a class that importes this package classes, the compiler dosen't recognize the package.
It's a problem of updating the CLASSPATH?
Thanks in advance

I don't think this would be part of any standard java distribution.
But I found a couple of jars (versions) available for download at
http://ebxmlrr.sourceforge.net/maven/repository/xacml/jars/

How do I write a Java Class that Loads a RPT and exports to PDF All Automatically?

I am using Crystal Reports for Eclipse and I am trying to create a java class that will do everything independently. It will take a .rpt file, load it with data from the database and then export that to a pdf file and put that pdf in a specific location with a specific name. I am using the Crystal Reports for Eclipse and the sample jsp project does that but I am looking for a java class example that doesn't require human interaction through the website. I have read the help file and seen snippet examples but I am not seeing a complete example. Could someone point me in the proper direction of a good example either in the forum or the help file for eclipse?

Hi, If you wanted to achieve this in a JSP page then I would suggest using the JSP Page Wizard as it allows you to select PDF as an output type. You can run the wizard and choose the PDF output and it will automatically generate the required code for you. However, as you want to use a Java class then I would suggest downloading the following package of sample code:<a href="http://support.businessobjects.com/communityCS/FilesAndUpdates/crxi_r2_jrc_desktop_samples.zip">http://support.businessobjects.com/communityCS/FilesAndUpdates/crxi_r2_jrc_desktop_samples.zip</a> This package includes a number of sample Java classes that demonstrate how to use the engine. The one that you will be interested in is titled "JRCExportReport" To make life easier I would suggest trying the class in a Crystal Reports Web Project as the runtime libraries will automatically be in the classpath. Anyway, give this a shot and let me know how you make out. Regards, Sean Johnson (CR4E Product Manager) <a href="http://www.eclipseplugincentral.com/Web_Links-index-req-ratelink-lid-639.html">Rate this plugin @ Eclipse Plugin Central</a>

Deploying java class that uses oraclexmlsql.jar

Hi,
I'm trying to deploy a java class that I wrote. It simply gets some data out of my oracle database as xml using the oraclexmlsql package. It works fine when I compile it within JDeveloper.
When I try to deploy it JDeveloper gives out the following error:
Errors in xmlquerydb:
ORA-29521: refferenced name oracle/xml/sql/query/OracleXMLQuery could not be found
loadjava: 1 errors
I can't figure out why that happens. I have used other classes and deployed them as Java stored Procedure and they work fine.
Thanks for help
Andre

I tried to load the oraclexmlsql.jar into the shema where I put my class. The classes from this jar were loaded but can not be compiled( apart from 3 ). I also tried loading my class into sys but I still can't compile it or the oraclexmlsql.jar classes.
Is the xsu12.jar a collection of all the classes that are allready in Sys after the database install?
I have noticed that on expanding the oraclexmlsql.jar file has a strange format and two classes classes are in the directory from which I expanded the jar. These two classes do not get a synonym on loading into the db. Could that have anything to do with it?
Thanks for more help
Andre

Suffering an complie error when trying to compile java class in EBS11i

Hi,
When I trying to compile java classes with which imported the HttpServletResponse class, will get the follow error message:
package javax.servlet does not exist
cannot resolve symbol
symbol : class HttpServletResponse
It seems the javax.servlet package is not included in the classpath. But I checked the $CLASSPATH, it seems no problem.
echo $CLASSPATH
/u02/applvis/viscomn/util/java/1.4/j2sdk1.4.2_04/lib/tools.jar:/u02/applvis/viscomn/util/java/1.4/j2sdk1.4.2_04/lib/dt.jar:/u02/applvis/viscomn/util/java/1.4/j2sdk1.4.2_04/jre/lib/charsets.jar:/u02/applvis/viscomn/util/java/1.4/j2sdk1.4.2_04/jre/lib/rt.jar:/u02/applvis/viscomn/java/appsborg2.zip:/u02/applvis/visora/8.0.6/forms60/java:/u02/applvis/viscomn/java
Does anyone know the reason?
environment: ebs 11i
Thanks&Regards,
Xiaofeng

resolved this issue.
1. Edit $APPL_TOP/admin/adovars.env file -
Add the following jar files to the AF_CLASSPATH line -
Full path of /...../iAS/Apache/Jsdk/lib/jsdk.jar
Full path of /...../iAS/Apache/Jserv/libexec/ApacheJServ.jar
2. Bounce the concurrent manager in order to have the changes take effect.

Java.lang.NullPointerException when trying to compile

Hi everybody!
I'm trying to compile a file using javax.tools.JavaCompiler but I get a java.lang.NullPointerException when running the program.
Here is my code:
public boolean CompExecFile(File filename){
 boolean compRes = false;
 try {
 System.out.println(filename.getAbsolutePath());
 JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
 StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null); //line where I get the error
 Iterable<? extends JavaFileObject> compilationUnits2 = fileManager.getJavaFileObjects(filename);
 compRes = compiler.getTask(null, fileManager, null, null, null, compilationUnits2).call();
 fileManager.close();
 if (compRes) {
 System.out.println ("Compilation was successful");
 } else {
 System.out.println ("Compilation failed");
 } catch (IOException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 return compRes;
 }There error on the line "StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null);":
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException+
I've seen several examples using the parameters "null,null,null" but I don't know if it's good :(
Many thanks for your help.

I've found something which could maybe be what I need to do but I'm not sure:
// Build a new ClassLoader using the given URLs, replace current Classloader
ClassLoader oldCL = Thread.currentThread().getContextClassLoader();
ClassLoader newCL = new URLClassLoader(myClasspathURLs, oldCL);
Thread.currentThread().setContextClassLoader(newCL);
System.out.println("Successfully replaced ClassLoader");
Class fooClass = newCL.loadClass(appClass); //which replaces the line "Class<?> tempFileClass = Class.forName("TempFile");" ?!Is that what I need to do?
EDIT: I've tried that but I still have the same problem:
 File classFile = new File ("TempFile.class");
 ClassLoader oldCL = Thread.currentThread().getContextClassLoader();
 ClassLoader newCL = new URLClassLoader(new URL[] {classFile.toURL()}, oldCL);
 Thread.currentThread().setContextClassLoader(newCL);
 System.out.println("Successfully replaced ClassLoader");
 Class tempFileClass = newCL.loadClass("TempFile");
 Method main = tempFileClass.getMethod("main", String[].class);
 main.invoke(null,new String[0]); Edited by: Foobrother on Jul 28, 2008 8:18 AM

I am trying to compile an example class that imports a lot

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