Lazy downloading broken for updated jar-files?

Hello,
Using webstart-6.0 + jar-index + download="lazy" works great - jar files are downloaded on demand when they are really needed.
However when updating all jar-files, the files that have been downloaded lazily and cached before are downloaded again before the application can be launched, not only on demand.
Is this the intended behaviour, and is there any way to let webstart lazily download updates, just when the jar-files are needed?
Thank you in advance, lg Clemens

Libraries loaded from the j2ee/home/lib directory are opened and loaded at the J2EE container level. So they are accessed from the very start of the server, to the point where it is stopped.
Therefore if you modify a class library which has already been loaded, you may run into file locking related issues (which will be OS dependent, Windows for example probably won't even let you overwrite the file) so that is what you are likely to be seeing.
JAR files loaded at the J2EE container level aren't really suitable for dynamic updating -- the classes can be referenced in a multitude of other classloaders.
As you have seen, replacing a J2EE container level class file, then a restart will be required along the lines of what you have written.
Stop mid-tier, move new file in and restart?? cheers
-steve-

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Update jar file with modified class files

hi all,
I'm developing a jar utility for updating a jar file with modified class files as of now i have reached a point where in i can browse files and set it to required location
i.e i have developed a swings GUI application using JfileChooser and browse the files ..now my requirement is to update the jar files with modified class file
GUI looks like below
....enter the modified class file ----> d:\c.class
....enter the jar file path ---> d:\a.jar
                                                      update button now i have the requirement as
1> when i click on the update button ,my jar file (a.jar) should get updated with the latest class file (c.class)
can u help me to achieve this requirement.???
im stuck with this,,,if u can provide me wit the code for updating jar file with latest class file...it will really be helpful
if u can help me with the code on click on update button it will be really helpful
Thanks and expecting a faster response from u all java experts....

Please find my query in bolds...i have written the partial code now,i need some help now
hope u guys can help me out...
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
public class FileExplorer extends JDialog implements ActionListener
     JTextField txtLocation_class;
     JButton btnBrowse_class;
     JLabel label_class;
     JTextField txtLocation_jar;
     JButton btnBrowse_jar;
     JLabel label_jar;
     JButton updatebutton;
     public FileExplorer()
               setSize(600,300);
               //for class files
               label_class = new JLabel("Please select Modified Class File");
               txtLocation_class= new JTextField(20);
               btnBrowse_class = new JButton("Browse");
               btnBrowse_class.addActionListener(this);
               //for jar files
               label_jar = new JLabel(" Please select the Jar file");
               txtLocation_jar= new JTextField(20);
               btnBrowse_jar = new JButton("Browse");
               btnBrowse_jar.addActionListener(this);
               ActionListener updateListener = new ActionListener(){
                public void actionPerformed(ActionEvent ae){
                 if(ae.getActionCommand().equalsIgnoreCase("Update")){
                  System.out.println("ae.getActionCommand() :: "+ae.getActionCommand());
                  System.out.println("Update Button is pressed");
                *//Query :how do i access FilePath and FilePath1 here which*
*                // has been set in public void actionPerformed(ActionEvent ae)*
*                //method below*
*                // FilePath ---??*
*                // FilePath1 ---??*
*                // how do i access the above 2 parameters*
*                //Query :on click of update button i have to pass*
*                //two parameters FilePath and FilePath1 to*
*                //perform some functionality. please help me*
*                //to achieve this..how do i access Filepath and Filepath1*
*                //here which has been set below.*
                 } // end of if
               } // end of actionPerformed
            };// end of ActionListener
              updatebutton = new JButton("Update");
              updatebutton.addActionListener(updateListener);
               //adding to the panel
               JPanel pnl = new JPanel();
               pnl.add(label_class);
               pnl.add(txtLocation_class);
               pnl.add(btnBrowse_class);
               pnl.add(label_jar);
               pnl.add(txtLocation_jar);
               pnl.add(btnBrowse_jar);
              pnl.add(updatebutton);
               getContentPane().add(pnl);
     public void actionPerformed(ActionEvent ae)
          Object obj=ae.getSource();
          if(obj==btnBrowse_class)
               final JFileChooser fcstudent = new JFileChooser();
               int rtrnval = fcstudent.showOpenDialog(this);
               if(rtrnval==JFileChooser.APPROVE_OPTION)
                    try
                         File file=fcstudent.getSelectedFile();
                         String path = file.getPath();
                         System.out.println("This is Path:"+path);
                         txtLocation_class.setText(""+path);
                         String FilePath=txtLocation_class.getText();
                         System.out.println("FilePath is ::"+FilePath);
                    catch(Exception ex)
                         ex.printStackTrace();
          }else if(obj==btnBrowse_jar){
                         final JFileChooser fcstudent = new JFileChooser();
                         int rtrnval = fcstudent.showOpenDialog(this);
                         if(rtrnval==JFileChooser.APPROVE_OPTION)
                              try
                                   File file=fcstudent.getSelectedFile();
                                   String path1 = file.getPath();
                                   System.out.println("This is Path:"+path1);
                                   txtLocation_jar.setText(""+path1);
                                   String FilePath1=txtLocation_jar.getText();
                                   System.out.println("FilePath is ::"+FilePath1);
                              catch(Exception ex)
                                   ex.printStackTrace();
     public static void main(String arg[]){
               FileExplorer Exm= new FileExplorer();
               Exm.setVisible(true);
}

Error While Opening an Updated JAR file

Frnds,
I have some problem with a JAR file update. Seek ur help in this regard.Here goes my problem.
I need to update a jar file ( need to replace a single .class file with a new one ). I updated the JAR file using ' jar uf ' command and it was successfull.. I removed the old JAR file and replaced it with the updated JAR file. But when i tried to invoke the JAR application using Java we start iam unable to open the applicaiton. But when i replace this upadted JAR file with the old JAR file ( using the backup) the application loads correctly.
The application is hposted in Apcahe web server. Is a server restart required after deploying the updated JAR file or is this porblem due to some other reasons.
Thanks in advance.
Regards,
Bala.

It appears that the New Report .vi only accepts the .xlt template format and not .xltx as one would commonly expect. I am currently working to determine for sure that this is the case, but it does run (mostly) properly on my end if you make that change.
When I say mostly, I mean there are a couple other minor issues with your code. First the first frame of your sequence structure is really accomplishing anything. If your intent is to open a reference to the excel template, there is no need because the New Report .vi does it automatically.
Second, you will need a file path of some sort wired in to your Save Report to File .vi or else you will get a different error message after fixing the .xlt issue. I am currently researching whether this should be marked as a required terminal instead of recommended so that it not being wired would result in a broken run arrow rather than an error.
Let me know if these suggestions resolve your issue, or if I can provide further input on what you are doing in your first frame. I will touch base again once I determine whether these are expected behaviors or bugs.
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"If in doubt... flat out." - Colin McRae

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I have a problem that shows up somewhat infrequently. Once in a while, when I start my offline-allowed application, newer versions the application (e.g. updated JAR files) are not automatically downloaded. If I close the application and restart, the newer JAR files are properly downloaded. Has anyone else seen this problem?
A perhaps related question I have is how long does web start wait for the head request to come back when it checks for newer JAR files?
Thanks,
Joe

this post may help
http://forum.java.sun.com/thread.jsp?forum=38&thread=452567

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Spawning jar -u ... is also not a desired option.
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The method I am looking for is using the java.util.zip/java.util.jar packages to acheive the same result as jar -u...

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Libraries loaded from the j2ee/home/lib directory are opened and loaded at the J2EE container level. So they are accessed from the very start of the server, to the point where it is stopped.
Therefore if you modify a class library which has already been loaded, you may run into file locking related issues (which will be OS dependent, Windows for example probably won't even let you overwrite the file) so that is what you are likely to be seeing.
JAR files loaded at the J2EE container level aren't really suitable for dynamic updating -- the classes can be referenced in a multitude of other classloaders.
As you have seen, replacing a J2EE container level class file, then a restart will be required along the lines of what you have written.
Stop mid-tier, move new file in and restart?? cheers
-steve-

Why tomcat is still looking for old jar files?

Please help me it is a very serious problem.
I updated one of the jar files used by the project. I am using a new method that is available only in the new library. I removed the old jar files in my local system, and everything worked fine. Then I commit those files to the subversion, which is in the testing server, and then I created the war file. The war is successfully created, then I deployed to the tomcat. But, now there is an error in the portion I am using the method that is only available in the new jar files.
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WARNING: Failed to open JAR
java.util.zip.ZipException: No such file or directory
2.
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I problem is still there and it is because the testing server's tomcat is still looking for old jar files. I used Netbeans and add jar files as usual method.

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More than likely you are building your WAR file and your new JAR file is not being included in the build.

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Hi,
I want to update a jar file but everything I do ends in
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Regards,
Patrick
Thats my project:
/myapp/myapp.html
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/myapp/myapplication.jnlp
/myapp/myapplication.jpg
/myapp/meta-inf/Manifest.mf
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Now there are no error messages but JWS downloads the
complete jar file.If you specify "eager", Web Start is told to load that jar immeadiately.
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Lazy download (thus at a latter time), or the download of a specific version of the jar or differential download?
Regards,
Marc

Multiple download of the same JAR file

We have a collection of applets packaged in a single JAR file. Some users (web developers that use our applets) have been complaining that the applet is extremely slow to start up.
When the html page includes more than one applet from the same JAR file then, "ONLY IN SOME CASES", the JAR file is downloaded multiple times.
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Mmm... I don't think this is the solution... all the applets share a lot of classes (the big part of the JAR files).
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Lazy downloading broken for updated jar-files?

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