Please Help With Jar File

I have a jar file named Helper.jar with
com.xyz.util.Helper.class in it.
Now I have a SrcFile.java that
imports com.xyz.util.Helper;
It compiles fine with:
java -classpath Helper.jar;. SrcFile.java
...and runs fine with:
java -cp Helper.jar;. SrcFile
When I jar it with:
jar cvfm SrcFile.jar SrcFile.mf *.class
...and run it with:
java -cp Helper.jar;. -jar SrcFile.jar
I get the following exception:
java.lang.NoClassDefFoundError: com/xyz/util/Helper
...but yet, Helpler.jar runs fine with:
java -jar Helper.jar
Does anyone have any idea what I am doing wrong or
do I have to un-jar the Helper.jar file and
re-jar SrcFile.jar with all the .class files?

I've replied to this same thread in the New To Java Technology fourm, see there for a suggestion.

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Please Help! .jar file don't work.

Hi, I've written a swing program that works fine when run from command prompt but it doesn't work when I create a self executable jar file and run it.
Here's the generated classes after compiling the source file:
TheGMailClient.class (main class)
TheGMailClient$1.class
MailSender.class
MyAuthenticator.class
I also have a GIF image file.
Here's what written in the manifest file:
Manifest-Version: 1.0
Created-By: 1.4.2_05 (Sun Microsystems Inc.)
Main-Class: TheGMailClient
I've created the jar file with the following command:
jar cvfm TheGMailClient.jar MANIFEST.MF -C classfiles .And here's the exceptions shown after running the jar file (I've run the jar file from command prompt using the java -jar command to view the exceptions):
java.lang.NoClassDefFoundError: javax/mail/MessagingException
        at TheGMailClient.actionPerformed(TheGMailClient.java:238)
        at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
        at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Unknow
n Source)
        at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
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        at java.awt.Component.processEvent(Unknown Source)
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        at java.awt.Component.dispatchEventImpl(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Window.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
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The error is occuring because the jar ignores the system classpath.
You need to set your classpath in the manifest file to find the external jars.
Otherwise the external jars will not be found.
In your case class javax/mail/MessagingException
For example:
Manifest-Version: 1.0
Created-By: 1.4.2_05 (Sun Microsystems Inc.)
Main-Class: TheGMailClient
Class-Path: . jars/mail.jar jars/activation.jar
The path will need to be correct in the above related to your system.
Also because you mention a gif image.
You will need to add the image to the jar - you haven't.
make sure you are loading the GIF image file in a manner that can be used from a jar.
Image image = null;
try {
image = ImageIO.read(getCkass().getResource("logo.gif"));
catch {
// what ever
}You may need a relative path to the image in the jar depending on where the gif is.
For example image = ImageIO.read(getCkass().getResource("images/test.gif"));
rykk

Urgent help with jar file

I'm writing a program in VB that calls on a JAR file. It has been working great for weeks. Last night, I moved the JAR file to a new location on my machine, and it suddenly stopped working at all.
I know nothing about Java. Do I need to recompile the file? I tried moving the whole directory back to its original location but it didn't help.
Thanks in advance.

Dude I'm telling you straight up, the program has a bug. The evidence is in the error message. Maybe the bug was not manifested before, but it was there.
Do you have access to the source? Do you know how to compile it? You should recompile it with the -g flag to include debug information. Then the error message will include a method name and line number for the offending portion of code. If you're not able to figure it out yourself, you could post that portion of code here for someone to comment on.

Now what? Help with .jar files

Hey. I just finished a program. I want to share it with my friends or anyone else. I can create a .jar file but I have no idea what to do next. Is there an easy way to "publish" your programs (like create a .exe file?). Any help or ideas would be appreciated. Thanks, Merlot14

java -jar MyFile.jarwill work if you've set your manifest correctly. If you're distributing only to Windows users, you could include a shortcut, I believe. Similarly, for distribution to Linux/OS X users, you could include a shell script.

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I have made an application that uses the javax.comm library for serial port drivers. It works perfectely but when I put all the .class in a .jar and start the application it starts properly with no errors but it doesn't see the com's of the computer.
I would apreciate if you could help me out
greetings
paul

You have to modify the source code of the javax.comm class files you are using.. the line contains "package javax.comm;" should be deleted. And then compile those modified files and put the compiled files to your jar file. Or you can create a folder "javax" and subfolder "comm" in that folder and put those original .class files into "javax/comm". After that, put that "javax" folder into your jar file.

Help with JAR Files

OK, folks, I need some help here...
And I have researched on this prior to this post, but I still don't get it.
I have a simple application in Reminder.java file. When I compile it, I get Reminder.class and Reminder$ReminderThread.class, because I have an inner class.
I place those files in Reminder directory. I want to make an executable JAR file, so I made a manifest file outside the Reminder directory that contains these lines
Manifest-Version: 1.0
Main-Class: Reminder.Remindersince the Reminder.class is within the Reminder directory, I understood I had to have a prefix "Reminder."
In the command line, I type
jar cmf manifest Reminder.jar Reminder/Reminder.class Reminder/Reminder$ReminderThread.classAnd I do get a Reminder.jar file, but when I double-click on it, I get a popup saying "Could not find the main class. Program will exit!"
So, what am I doing wrong and how can I fix this? As I said, I have researched, but I can't understand what went wrong nor how to fix the problem.
Any help will be greatly appreciated.

Never mind, I solved it, I was missing a carriage return in my manifest file. I feel so stupid now...

Newbie help with JAR files

Okay,
I built a simple Hello World project with Swing and it worked. Now I've build my own program from scratch and get a "Cannot find the main class" error from the JRE. Below are the contents of the manafest file craeted by Sun Java Studio 8.
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.2
Created-By: 1.5.0_06-b05 (Sun Microsystems Inc.)
Main-Class: localPkg.mainForm
X-COMMENT: Main-Class will be added automatically by build
Also here is the source code for localPkg.mainForm
* mainForm.java
* Created on January 17, 2006, 9:32 AM
* @author rowen
package localPkg;
import java.beans.*;
public class mainForm extends javax.swing.JFrame {
/** Creates new form mainForm */
public mainForm() {
initComponents();
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents() {
java.awt.GridBagConstraints gridBagConstraints;
ctoF1 = new MyBeans.CtoF();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
numericField1 = new magicbeans.NumericField();
numericField2 = new magicbeans.NumericField();
ctoF1.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
public void propertyChange(java.beans.PropertyChangeEvent evt) {
ctoF1PropertyChange(evt);
ctoF1PropertyChange1(evt);
getContentPane().setLayout(new java.awt.GridBagLayout());
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("Farenheight");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 0;
gridBagConstraints.gridwidth = 2;
gridBagConstraints.ipadx = 2;
gridBagConstraints.anchor = java.awt.GridBagConstraints.NORTHWEST;
gridBagConstraints.insets = new java.awt.Insets(20, 110, 0, 0);
getContentPane().add(jLabel1, gridBagConstraints);
jLabel2.setText("Celsius");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 2;
gridBagConstraints.anchor = java.awt.GridBagConstraints.NORTHWEST;
gridBagConstraints.insets = new java.awt.Insets(11, 110, 0, 0);
getContentPane().add(jLabel2, gridBagConstraints);
numericField1.setText("farenheightField");
numericField1.setName("farenheightField");
numericField1.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
public void propertyChange(java.beans.PropertyChangeEvent evt) {
numericField1PropertyChange(evt);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 1;
gridBagConstraints.gridwidth = 4;
gridBagConstraints.ipadx = 119;
gridBagConstraints.anchor = java.awt.GridBagConstraints.NORTHWEST;
gridBagConstraints.insets = new java.awt.Insets(6, 110, 0, 160);
getContentPane().add(numericField1, gridBagConstraints);
numericField2.setText("celsiusField");
numericField2.setName("celsiusField");
numericField2.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
public void propertyChange(java.beans.PropertyChangeEvent evt) {
numericField2PropertyChange(evt);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 3;
gridBagConstraints.gridwidth = 3;
gridBagConstraints.ipadx = 99;
gridBagConstraints.anchor = java.awt.GridBagConstraints.NORTHWEST;
gridBagConstraints.insets = new java.awt.Insets(6, 110, 191, 0);
getContentPane().add(numericField2, gridBagConstraints);
pack();
// </editor-fold>
private void numericField2PropertyChange(java.beans.PropertyChangeEvent evt) {
ctoF1.setC(numericField2.getValue());
private void numericField1PropertyChange(java.beans.PropertyChangeEvent evt) {
ctoF1.setF(numericField1.getValue());
private void ctoF1PropertyChange1(java.beans.PropertyChangeEvent evt) {
numericField2.setValue(ctoF1.getC());
private void ctoF1PropertyChange(java.beans.PropertyChangeEvent evt) {
numericField1.setValue(ctoF1.getF());
* @param args the command line arguments
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new mainForm().setVisible(true);
// Variables declaration - do not modify
private MyBeans.CtoF ctoF1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private magicbeans.NumericField numericField1;
private magicbeans.NumericField numericField2;
// End of variables declaration
Using Sun Java Studio Enterprise 8 (patch 1), on Windows XP (most recent patches)
Thanks in advance,
Roy

R_Owen ,
One possible way of how to do it in JSE8 is:
1. Put all necessary lib jars to some place under src folder.
2. Add those jars into Compile-time libraries list (Project properties -> Libraries) for correct compilation
3. Switch to 'Files' JSE8 tab, open manifest.mf file (it's in projects root) and add your lib jars to it.
Syntax is:
Class-Path: relative URLs
That's it.
And Class-Path attribute description from JAR File Specification:
http://java.sun.com/j2se/1.3/docs/guide/jar/jar.html#Main%20Attributes:
�Class-Path:
The value of this attribute specifies the relative URLs of the extensions or
libraries that this application or extension needs.
URLs are separated by one or more spaces.
The application or extension class loader uses the value
of this attribute to construct its internal search path. �
Copy/paste from:
http://swforum.sun.com/jive/thread.jspa?forumID=122&threadID=60169

Help with jar files and running them

I have been trying to figure out how to run executable java files, now I have heard that a million and one people have asked this already. Though when I see the answer to these questions I am still quite confused, I would like to understand some things. First thing is how do you even save your java code as a jar file. Secondly, what is a jar file. Thirdly, I have seen many people talking about batch files, what are they? And finally, I have used many "wrappers" and I still cannot get it to work. Plz help

A quick google search gave me [url http://neptune.netcomp.monash.edu.au/JavaHelp/howto/jar.htm]this website about jars.

Need help with Jar file

I am writing an Application in Java using swing and all that good stuff but I am currently ready to do some beta testing to find any other errors.
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For some reason I keep getting a cannot find main class error??
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Manifest-Version: 1.0
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Created-By: 1.4.0_01 (Sun Microsystems Inc.)
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Help with Jar file exception

I have been following the example of instruction at:
http://forum.java.sun.com/thread.jsp?forum=31&thread=332680
But I get an exception when I do the following.
D:\pro>jar umf mf.txt myjar.class
java.io.IOException: invalid header field
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D:\z>jar cf myjar.jar myjar.class
D:\z>jar umf mf.txt myjar.class
D:\z>java -jar myjar.jar
Failed to load Main-Class manifest attribute from
myjar.jar
D:\chris\1\z>help please.

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i recently purchased an ipod touch, and all i want to do is get some music on it, and update the firmware, but i cant use itunes, cuz im getting 'there are some files missing' problem.
I swear to god, if i dont get this fixed by the end of the week, im gonna post the latest video on youtube... on how to smash up apple products.
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Using XP home, all updates installed... latest itunes,

It will probably help if you'll post the exact error message and when it's occurring. Otherwise we'll just be guessing, not that someone here might not have a good guess. I'm going to guess that this thread might help:
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Hello,
I am trying to archive old 16mm films. I purchased a telecini and i am importing in to a Panasonic DVD video recorder and burning on to DVD. I am not sure this is important. The challenge I have is that when I put the DVD in my Powerbook g4 it opens the DVD and reads as a RTAV file. When I open the RTAV file the file is empty. I have never experienced this before and I don't even know what an RTAV file is. Please excuse my ignorance if this is basic.
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Apple mpeg2 plugin (19$) + Streamclip (free)
VisualHub (23.32$)
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Cinematize >60$
Mpeg2Works >25$ + Apple plug-in
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connect a miniDV Camcorder with analogue input to a DVD-player and transfer disk to tape/use as converter
http://danslagle.com/mac/iMovie/tips_tricks/6010.shtml
http://danslagle.com/mac/iMovie/tips_tricks/6018.shtml
http://karsten.schluter.googlepages.com/convertdvdstodvs
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+be nice to copy rights ...+

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Please Help With Jar File

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