6.1 Doesnt read classes that arent part of packages

Migrating webapps from 6.0, it appears the 6.1 server doesnt find classes that are in WEB-INF/classes directory. When I place them in packages it finds them. Do I have to convert all classes to be part of a package now?

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Dynamically loading a class that is part of a larger loaded package

I am dynamically loading a class that is part of a large package, much of which is loaded at startup. The code directly references protected variables in the parts of the package that is loaded by the default class loader. Attempting to access these protected variables gives an access error when the class is dynamically loaded that doesnt occur when the class is loaded at startup.
Is there a way to make this work?

To answer my own question -- no
A reference from http://access1.sun.com/techarticles/DR-article.html says:
The use of Dynamic Class Reloading can introduce problems when classes that are being dynamically reloaded make calls to non-public methods of helper classes that are in the same package. Such calls are likely to cause a java.lang.IllegalAccesserror to be thrown. This is because a class that is dynamically reloaded is loaded by a different classloader than the one used to load the helper classes. Classes that appear to be in the same package are effectively in different packages when loaded by different classloaders. If class com.myapp.MyServlet is loaded by one classloader and an instance of it tries to call a non-public method of an instance of class com.myapp.Helper loaded by a different classloader, the call will fail because the two classes are in different packages.
So not being able to access non-private variables in this scenario is the way it works.

Cannot compile two classes that are on same package

When I compile two classes that are on same package one class that is independent of other class gets compiled but the other class which uses
the first one shows cannot find symbol error with the first class name

try...
javac *.java
that should compile all the java files in that folder at the same time. I dont know if that will fix your problem but it is worth a shot.

Importing a class that is stored online

I hope this is the right forum... appologies if not.
I am wondering how to access classes that are stored on the internet.
I own the domain www.l4eclan.com. I created a package (I think) of classes on it, but I can't figure out how to access the classes in that package.
The url of the package is located at:
Code:
http://www.l4eclan.com/minion
Right now, there are 2 files in it: alignment.java and alignment.class. Each has "package minion;" at the top of it.
I tried accessing the class with "import com.l4eclan.minion.*;" and "import com.l4eclan.*;" but neither worked.
Can anyone tell me what I am doing wrong?

So it's not possible for Java to read classes that
aren't stored on the local machine?Not with the import statement.
The whole point of this program is to read classes
stored in that directory on the internet... not to
read them from the local machine.Then you have a problem.

Compiling error in my test file for Reader class.

I did a small program trying to test Reader class, here is my code:
package testfilereader;
import java.io.*;
import java.io.Reader;
import java.io.InputStream;
* Title:
* Description:
* Copyright: Copyright (c) 2001
* Company:
* @author
* @version 1.0
public class FileTest {
public static void main(String args[]){
Byte buff[] = new Byte[80];
try{
InputStream r = new FileInputStream("test.txt");
int i = r.read(buff);
String s = new String(buff);
System.out.println(s);
}catch(NullPointerException e){}
catch(IOException e2){}
But I continue to get compiling errors:
C:\>javac FileTest.java
FileTest.java:19: cannot resolve symbol
symbol : method read (java.lang.Byte[])
location: class java.io.InputStream
int i = r.read(buff);
^
FileTest.java:20: cannot resolve symbol
symbol : constructor String (java.lang.Byte[])
location: class java.lang.String
String s = new String(buff);
Please advise what is wrong here.

Replace Byte with byte - the methods
expect arrays of byte; not Byte (which is a simple
class wrapper for byte).Hi, I changed to:
byte buff[] = new byte[80];
Same errors, any other ideas?

Still cannot get my 2 classes to run as a package

I have written an application called "MediaPlayerDemo", which creates a visual component to be added to the Container or GUI created in another class called "menu."
Both java source files are in <c:/TEST> dir.
1) MediaPlayerDemo.java has the stmt: <package TEST;> at the begining of my source code.
2) The MediaPlayerDemo class files have been stored in <c:/jdk1.2.2/jre/classes/TEST> as user classes.
4) The menu class imports my MediaPlayer class with the stmt: <import TEST.MediaPlayerDemo;>
5) menu has been compiled and stored in <c:/TEST> dir
It runs but nothing happens. The same files run correctly without the package declarations. Have I forgotten anything? Please let me know. If anyone can help or wants to view the code, I will send it.

Class "MediaPlayerDemo" is a user defined class that is part of the <Test> Package. It is used to create a Jpanel that will be added to the container in my "menu" class. Class "menu" is not part of the package, it just imports the <TEST.MediaPlayerDemo> Package for it's on use.

Import classes that are not part of any package

I have this problem with the JDK1.4 compiler:
I have a few classes that were created outside of any package for some JNI uses. When I used JDK1.3 to compile, I was able to get the compiler to find these classes by doing the following in the calling classes:
import ClassOutSideOfPackage;
Now that I am trying to use JDK 1.4, the compiler complains with the following error:
"." expected
import ClassOutSideOfPackage;
I tried to take the import out and had no luck. The compiler complained that it can't find this class. What can I do or is the only solution to change the class to include it in a package and change all relavant JNI native calls... etc. Thank you.

Removing the entire import statement should work. Check for a classpath problem if it
doesn't. It is not necessary to place in a package and recompile, though.I tried your suggestion. However, it keeps complaining that it can't find the class. The class file resides in the current directory and I have "." at the beginning of my class path. I don't see anything wrong with the classpath. Did you have this working?

Accessing the ServletContext from a class that is not a Servlet?

Is there any way of accessing the ServletContext from a class that is not a
          Servlet? The class is being used as part of a Web Application.
          Thanks.


http://www.mozilla.org/mirrors.html
Mozilla has download mirrors around the globe. If it is on the list, it is trustworthy.

Calls to methods in a class that extends Thread

Hello,
I have some code that I am initiating from within an ActionListener that is part of my programs GUI. The code is quite long winded, at least in terms of how long it takes to perform. The code runs nicely, however once it is running the GUI freezes completely until operations have completed. This is unacceptable as the code can take up to hours to complete. After posting a message on this forum in regard to the freezing of the GUI it was kindly suggested that I use multi-threading to avoid the unwelcome program behaviour.
The code to my class is as follows:
public class FullURLAddress
private boolean success_flag = true;
private BufferedReader iN;
private Document dT;
private EditorKit kT;
private Element lmNt;
private ElementIterator lmIterate;
private XURL[] compAddress;
private int countX = 0;           //Tracks Vector vT's size.
private int countY = 0;           //Tracks Vector vS's size.
private int xURLcount = 0;        //Tracks XURL objects instantiated by this FullURLAddress object.
private SimpleAttributeSet simpAtSet;
private String aURL;              //Contains original (Xtended) URL!
private String fileType;
private String indexContent;
private String[] parseURL;
private String[] finalStrings;
private String[] sortStrings;
private URL indexConnect;
private URLConnection iconn;
private Vector vT;            //Stores href information, from targeted URL's HTML souce code.
private Vector vS;            //Stores sorted HREF info ".jpg" and ".gif" only (no: png, tiff, etc).
public FullURLAddress(String aURL)
    this.aURL = aURL;
    try{
      indexConnect = new URL(aURL);
      iconn = indexConnect.openConnection();
      iN = new BufferedReader(new InputStreamReader(iconn.getInputStream()));
        /* Document creation, analysis objects instantiated */
      vT = new Vector();
      vS = new Vector();
      kT = new HTMLEditorKit();
      dT = kT.createDefaultDocument();
      dT.putProperty("IgnoreCharsetDirective", Boolean.TRUE);
        /* Iterate through document and store all HREF values */
      kT.read(iN, dT, 0);
      lmIterate = new ElementIterator(dT);
      while((lmNt = lmIterate.next()) != null)
        simpAtSet = (SimpleAttributeSet)lmNt.getAttributes().getAttribute(HTML.Tag.A);
        if(simpAtSet != null)         //As long as there are A tags to be read...
          vT.addElement(simpAtSet.getAttribute(HTML.Attribute.HREF));
          countX++;//Tracks number of HREF occurences occur, giving better control of the Vector.
    }catch(MalformedURLException e){
      success_flag = false;
      System.out.println("FullURLAddress object has encountered a "+
                         "MalformedURLException at: "+aURL);
    }catch(IOException e){
      e.getMessage();
      success_flag = false;
    }catch(BadLocationException e){
      e.getMessage();
      success_flag = false;
    /* Searches through all HREF attributes that are now stored in Vector
       vT for occurences of the character string ".htm" */
    sortStrings = new String[countX];
    for(int i=0;i<countX;i++)
      sortStrings[i] = (String)vT.elementAt(i); //Vector Strings transfered into array.
      if(sortStrings.endsWith("gif")) // Does href value end with ".jpg"?
vS.addElement(sortStrings[i]); // If so add it to the sorted Vector vS.
countY++;
if(sortStrings[i].endsWith("GIF"))
vS.addElement(sortStrings[i]);
countY++;
if(sortStrings[i].endsWith("jpg")) // Does href value end with ".jpg"?
vS.addElement(sortStrings[i]); // If so add it to the sorted Vector vS.
countY++;
if(sortStrings[i].endsWith("JPG"))
vS.addElement(sortStrings[i]);
countY++;
finalStrings = new String[countY];
for(int j=0;j<countY;j++)
finalStrings[j] = (String)vS.elementAt(j);
public int getCount()
return countY; //Returns number of instances of htm strings
} //ending with either "jpg" or "gif".
public String[] xurlAddressDetails()
return finalStrings;
I have changed the above code to make use of multithreading by making this class extend Thread and implementing the run() method as follows:
public class FullURLAddress extends Thread
private boolean success_flag = true;
private BufferedReader iN;
private Document dT;
private EditorKit kT;
private Element lmNt;
private ElementIterator lmIterate;
private XURL[] compAddress;
private int countX = 0;           //Tracks Vector vT's size.
private int countY = 0;           //Tracks Vector vS's size.
private int xURLcount = 0;        //Tracks XURL objects instantiated by this FullURLAddress object.
private SimpleAttributeSet simpAtSet;
private String aURL;              //Contains original (Xtended) URL!
private String fileType;
private String indexContent;
private String[] parseURL;
private String[] finalStrings;
private String[] sortStrings;
private URL indexConnect;
private URLConnection iconn;
private Vector vT;            //Stores href information, from targeted URL's HTML souce code.
private Vector vS;            //Stores sorted HREF info ".jpg" and ".gif" only (no: png, tiff, etc).
public FullURLAddress(String aURL)
    this.aURL = aURL;
public void run()
    try{
      indexConnect = new URL(aURL);
      iconn = indexConnect.openConnection();
      iN = new BufferedReader(new InputStreamReader(iconn.getInputStream()));
        /* Document creation, analysis objects instantiated */
      vT = new Vector();
      vS = new Vector();
      kT = new HTMLEditorKit();
      dT = kT.createDefaultDocument();
      dT.putProperty("IgnoreCharsetDirective", Boolean.TRUE);
        /* Iterate through document and store all HREF values */
      kT.read(iN, dT, 0);
      lmIterate = new ElementIterator(dT);
      while((lmNt = lmIterate.next()) != null)
        simpAtSet = (SimpleAttributeSet)lmNt.getAttributes().getAttribute(HTML.Tag.A);
        if(simpAtSet != null)         //As long as there are A tags to be read...
          vT.addElement(simpAtSet.getAttribute(HTML.Attribute.HREF));
          countX++;//Tracks number of HREF occurences occur, giving better control of the Vector.
    }catch(MalformedURLException e){
      success_flag = false;
      System.out.println("FullURLAddress object has encountered a "+
                         "MalformedURLException at: "+aURL);
    }catch(IOException e){
      e.getMessage();
      success_flag = false;
    }catch(BadLocationException e){
      e.getMessage();
      success_flag = false;
    /* Searches through all HREF attributes that are now stored in Vector
       vT for occurences of the character string ".htm" */
    sortStrings = new String[countX];
    for(int i=0;i<countX;i++)
      sortStrings[i] = (String)vT.elementAt(i); //Vector Strings transfered into array.
      if(sortStrings.endsWith("gif")) // Does href value end with ".jpg"?
vS.addElement(sortStrings[i]); // If so add it to the sorted Vector vS.
countY++;
if(sortStrings[i].endsWith("GIF"))
vS.addElement(sortStrings[i]);
countY++;
if(sortStrings[i].endsWith("jpg")) // Does href value end with ".jpg"?
vS.addElement(sortStrings[i]); // If so add it to the sorted Vector vS.
countY++;
if(sortStrings[i].endsWith("JPG"))
vS.addElement(sortStrings[i]);
countY++;
finalStrings = new String[countY];
for(int j=0;j<countY;j++)
finalStrings[j] = (String)vS.elementAt(j);
/* What happens with these methods, will they need to have their
own treads also? */
public int getCount()
return countY; //Returns number of instances of htm strings
} //ending with either "jpg" or "gif".
public String[] xurlAddressDetails()
return finalStrings;
Are there any special things that I need to do in regard to the variables returned by the getCount() and xurlAddressDetails() methods. These methods are called by the code that started the run method from within my GUI. I don't understand which thread these methods are running in, obviously there is an AWT thread for my GUI and then a seperate thread for my FullURLAddress objects, but does this new thread also encompass the getCount() and xurlAddressDetails() methods?
Please explain.
This probably sounds a little wack, but I don't understand what thread is responisble for the methods in my FullURLAddress class aside of course from the run() method which is obvious. Any help will be awesome.
Thanks
Davo

Threads are part of code that allows you to run multiple operations "simultaneously". "Simultaneously", because threads are not run actually simultaneously in any one-CPU machine. Since you most propably have only one CPU in your system, you can only execute one CPU instruction at time. Basically this means that your CPU can handle only one java-operation at time. It does not matter if you put some code in thread and start it, it will still take up all CPU time as long as the thread runs.
So you would need a way to let other threads run also, for that purpose thread contains a yield feature that allows you to give time for other threads to run.
http://java.sun.com/j2se/1.4.1/docs/api/java/lang/Thread.html#yield()
You need to use thread's yield() method in your thread code, in a place you want to give other threads time to run. Also bear in mind that if you yield your first thread run to allow second thread to run, you also need to add yield to the second thread also. If you don't, after yielding the first thread, the second thread will eat up all CPU time until it finishes, thus meaning the rest of your first thread will be run after second thread is done.
One good place to execute yield() is usually at the end of a loop, for example 'for' or 'while' loop. This way you prevent for example while-deadlocks.
Here is a java thread tutorial, worthy reading:
http://java.sun.com/docs/books/tutorial/essential/threads/

Can I invoke a class that extends JAppl from another class extends JAppl

Can I invoke a class that extends JApplet from another class that extends JApplet. I need to invoke an applet then select an action which opens another applet. Thanks in advance.

Nobody is able to solve this problem, i cant even
think this things. i have hope so plz try and get
result and help.Did you understand what Sharad has said???
Yep, you can forward to specific error page from servlet when even error occured in JSP. In order to achieve you have to open jsp file from servlet say example by using reqdisp.forward.
handle exception in the part where you are forwarding. And forward to the specific error page inside catch block.

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/

Closing a class that extends JPanel

Hi, i have a class that extends JPanel(lets call it class A). In that class, if the user click the logout button, i want class A to close and display class B that extends JFrame. right now, i am able to call class B, but i cannot close class A.
I uses remove() to close class A, but it doesnt work... could u tell me what to do??
I put this code in class A...
if (e.getSource() == logoutButton)     {
     remove(this);
     new Rest_Login1();
     String [] ar = null;
     Rest_Login1.main(ar);
} Thx

so i want to remove the CustomerPanel3 and display the Rest_Login1...
some of my code look like this.
thx
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class CustomerPanel3 extends JPanel implements ActionListener
// some JButton, JLabel n etc
     public void actionPerformed (ActionEvent e)
          if (e.getSource() == logoutButton)     {
               remove(this);
               new Rest_Login1();
               String [] ar = null;
               Rest_Login1.main(ar);
public class Rest_Login1 {
     public static void main(String args[])
          JFrame login1 = new JFrame("Login User Interface");
          JFrame.setDefaultLookAndFeelDecorated(true);
          RestaurantLogin userpan = new RestaurantLogin();
          login1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          login1.setSize(600, 250);
          login1.setLocation(230,192);
          login1.getContentPane().add(userpan);
          login1.setVisible(true);
}

Message class defined as part of report/program statement

Hi,
This is a very general question but I am not sure to what this refers to.
"Message class defined as part of report/program statement"
What does this mean or what is this referenced to?
Thanks
Edited by: David Rivera on Feb 3, 2010 10:36 PM

Hello,
it means when you are creating a report / program you can assign one message class to that...
like:
report Ztest message-id <message class>
then you can access all the messages defined in that message class...
Thanks
K.

I have an Iphone 3Gs. I need to get contents of messages that were sent and received on the phone in June for evidence in court. I read online that the Iphone internal storage keeps all data done on phone in the storage. How do I get into it?

I have an Iphone 36s. I need to get contents of messages that were sent on the phone in June of this year. I read online that the phone has an internal storage that keeps all data when phone is used and that this internal storage can be accessed. I need the contents of particular messages for evidence in court. How do I get into the internal storage? I've tried some of the methods that people post online, but none of them have been successful. Help!

If you still have a backup from that point in time as part ofr your computer backup history, you could restore the backup folder, restore the phone from that backup and have the messages on the phone.
More details about restoring from old backups can be found here: iPhone and iPod touch: About backups

HT201302 Old iphone 3g has photos on it. When I plug into my imac iphoto and image capture only bring up photos in the camera roll. There were more photos on albums and photo library on the iphone that arent showing up in iphoto and icapture.

My old iphone 3g has photos on it. When I try to get the photos off and onto my imac iphoto and image capture only bring up the camera roll. I have more pictures that arent on the camera roll there are albums and a photo library full of pictures that I want off of this dang phone. I have tried everything and I cant email them to myself because the service has been cut off of the phone. They are stuck on the phone there is there any way to get them off? Am I missing something.

The iphone is not a storage/backup device. It simply mirrors the selected content of the computer to which it is synced.
Again, the photo sync is one way.
Did you fail to maintain a backup copy of your old computer?
Not good. You can e-mail the photos from your iphone. You do not need to have phoe service for this. The iphone uses wi-fi. The photos will never be of the original quality, as they are reduced when synced to iphone.

6.1 Doesnt read classes that arent part of packages

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