Help dealing with jar file

hi all
i'm trying to deal with a jar file:
in myPackage.myClass i call:
Class.forName("org.hsqldb.jdbcDriver");i know that this file is contained into the file named "hsqldb.jar"
where shall i place this jar file in order to be found by myPackage.myClass without edit any system variable like class-path?
thanx a lot
sandro

For the jar, no, as jar's must be explicitly referenced on the classpath.
For the un-jar'd classes yes.
If they are extracted so their directory tree starts in the same place as the directory tree of your classes
e.g.
someDirectory
|
+-- yourComapay
|    |
|    +- yourApp
|        |
|        +- YourClasses
|
+-- com
      |
      +- importedPackage
          |
          +- ImportedClassesSo long as 'someDirectory' is on the classpath. It should run.

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Help needed with jar file

hi, first of all sorry if my post is in wrong forum...but my application is done using swing so i am posting this here....and regarding my question...
I have made an GUI using Java swings and my application is working fine. Now i want to make an executable jar file for my GUI. I have read some tutorilas on making jar files and this is what i have done...
i have created a manifest file called mainClass.txt which has
Main-Class: MainWindow ,where MainWindow is my main class name.
Then i ran the jar utility with this command line:
jar cmf mainClass.txt example.jar *.class
With this line, I told jar to create a JAR file (option c) with modifications to the manifest file (option m) as specified within mainClass.txt, naming the JAR file (option f) as example.jar and including everything that matches the pattern *Class
everything is file till now but my problem is ...I have some library files from JFreechart software included in my GUI to generate barcharts..How can i include these library files in my example.jar file..
Kindly help me
Thanks
byee

I had this problem too. I ran my program out of JCreator and it worked flawlessly. I jarred it up into and Executable Jar and I would get a runtime error explaning I have not included the correct libraries.
What I did was look at the error, for example say it said something like:
org.uhoh.PathSys ClassDefNotFound (or something similar to this)
What I did was extract the library that contained that class file. Then in my project file where I kept my classes I made the folder org, then in org I made uhoh. Inside uhoh I copied over PathSys.class.
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I have created a jar file with the following cammand
jar cvf XXX.jar com images
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but the prob is that when i run my jar file with the following command
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Main is the main class
i can't see nay images on my buttons in short i can't accress images files...

satinderjit,
Here is some code that you can use to grab an image (whether in a jar or not). Note though that your .class files will live in the com directory. So, in order for your images to load (with image path = "images/myImage.gif", you either have to move your image folder to your com folder or use the following string for your image path "../images/myImage.gif".
/*=*******************************************************************
* getImage(): grabs an image from the same location this file is at. *
*     Works for when the images are in a jar or not.                 *
public static Image getImage(String img) {
   /* Replace the 'YourClassName' with the name of your
      class. Note that the .class file of the class
      that this method resides in must be placed
      relative to where the images are stored. So
      if the images are in a folder called images,
      this .class file must be placed in its parent
      directory. */
   URL url = YourClassName.class.getResource(img);
   Image image = null;
   if (url == null) {
      System.err.println("Unable to load image: " + img);
   } else {
      image = Toolkit.getDefaultToolkit().getImage(url);
   return image;
}//end getImage
/* use the above method in the following manner
   (notice the forward slash).   The image path I
   provided should work with your current setup. */
ImageIcon icon = new ImageIcon(getImage("../images/myImage.gif"));tajenkins

I am new with JAR files please help me

Hi Dear All,
I am new with JAR files, I know concept, but dont know how to careate JAR, and how do i use it?
Please help me.
Thanks

This tutorial covers that:
http://java.sun.com/docs/books/tutorial/deployment/jar/index.html

How to use javap with jar files ?

how to use javap with jar files ?
thanks

As long as the jar is on the class path, your gold. So,
javap -classpath myjar.jar mypackage.MyClass
Chuck

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They probably can do such s thing if they choose to do so.
Let them know that you would like this:
http://www.apple.com/feedback
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From the behaviour, I suspect that it has to do with the number of file handles.
Some LTFS vendors have a copy utility that deals very well with this situation.
I could not find anything like that for HP.
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Your LTFS solution is in certain situations much slower than the competitors; the difference is a huge factor three..
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URGENT Help for applet with JAR file in Netscape

I am having Applet with few classes
Html is in /www directory
and all class files are in /www/javaclassfiles
I jared all javaclassfiles with following command
c:\www\javaclassfiles>jar -cvf sample.jar TaxPaymentAppletForm.class *.class
where sample.jar is my jar file and TaxPaymentAppletForm.class is the main applet class file.
THEN I DELETED ALL CLASS FILES & KEPT ONLY SAMPLE.JAR FILE ON SERVER
My html code is like below:
<APPLET CODE="TaxPaymentAppletForm" ARCHIVE="sample.jar" CODEBASE="JavaClassFiles" WIDTH=460 HEIGHT=400></APPLET>
The things are running on IE properly, but not on Netscape. Netscape is giving following error :
java.io.IOException: <null>
at netscape.net.URLConnection.connect(Compiled Code)
at netscape.net.URLConnection.getInputStream(Compiled Code)
* at netscape.applet.AppletClassLoader.grabArchiveFile(Compiled Code)
at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
at netscape.applet.AppletClassLoader.<init>(Compiled Code)
at netscape.applet.AppletClassLoader.getClassLoader(Compiled Code)
at netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(Compiled Code)
at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled Code)
at java.awt.EventDispatchThread.run(Compiled Code)
at netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled Code)
# Unable to load archive http://nearbuy_server:90/iras/JavaClassFiles/sample.jar: java.io.IOException: <null>
# Applet exception: class TaxPaymentAppletForm could not be loaded
# Applet exception: class TaxPaymentAppletForm could not be loaded
# Applet exception: class TaxPaymentAppletForm could not be loaded
In netscape also it is sometimes running some times not, without any logical reson.
Any help regarding this is appreciated
manisha

Following is the more detailed analysis when applet is running and when not
On local server, it is running fine on both IE / Netscape
When I transfered jar file to live server
On IE it is running for the first time and then onwards not running, If I clear the catch then again applet is running.
For second time it is giving following error :
IOException Loading Archive: http://dev1.janusx-collections.com/iras/JavaClassFiles/AppletForm.jar
java.io.IOException: dev1.janusx-collections.com:80//iras/JavaClassFiles/AppletForm.jar
at com/ms/net/wininet/http/HttpInputStream.connect
at com/ms/net/wininet/http/HttpInputStream.<init>
at com/ms/net/wininet/http/HttpURLConnection.createInputStream
at com/ms/net/wininet/WininetURLConnection.getInputStream
at com/ms/vm/loader/JarArchiveSet.loadNextJar
at com/ms/vm/loader/JarArchiveSet.getResourceBits
at com/ms/vm/loader/JarArchiveSet.getClassData
at com/ms/vm/loader/ResourceLoader.getClassData
at com/ms/vm/loader/URLClassLoader.findClass
at com/ms/vm/loader/URLClassLoader.loadClass
at com/ms/vm/loader/URLClassLoader.loadClass
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.run
at java/lang/Thread.run
java.lang.ClassNotFoundException: TaxPaymentAppletForm
at com/ms/vm/loader/URLClassLoader.loadClass
at com/ms/vm/loader/URLClassLoader.loadClass
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.processSentEvent
at com/ms/applet/AppletPanel.run
at java/lang/Thread.run
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manisha

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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.
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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.

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Hi all,
I have two seperate JAR files which contain same files but different progressive versions.JAR 1 is version V1 and JAR 2 is Version V1.1
I have a program which loads classes from these two JARS and runs certain comparsions on them.CODE IS SHOWN and SO is ERROR.PLEASE HELP and ADVISE.Im on a UNix box using JDK 1.3.
CODE:
====
1.In my main i define the TWO JARS PATHS and the item to compare called ENTITYNAME as:
String jarFile1 = "/xenv/GFINet_Java/6.2_Z1/1.3.X/gfinet_entities.jar";
String jarFile2 = "/xenv/GFINet_Java/6.1_Y1/1.3.X/gfinet_entities.jar";
String entityName = "gfinet.entities.GFIBasketEntity";
2.Then i call the function
EntityVersionComparator evc = new EntityVersionComparator();
evc.test(jarFile1, jarFile2, entityName);
3.Test function loads the JARS
private void test(String jarFile1, String jarFile2, String entityName) throws Exception {
URLClassLoader jar1 =
(URLClassLoader)newClassLoader(jarFile1);
URLClassLoader jar2 =
(URLClassLoader)newClassLoader(jarFile2);
4. Load that item ENTITYNAME FROM JAR.
// load GFIBasketEntity from Jar1
GFIBaseEntity ent1 =
(GFIBaseEntity)loadClass(jar1, entityName).newInstance();
PROBLEM ERRORS:
==============
Exception in thread "main" java.net.MalformedURLException : no
protocol :/xenv/GFINet_Java/sun4/6.2.Z2/Solaris8/3.3.2/1.3.X/lib/gfinet_entities.jar
at java.net.URL.<init>(URL.java:473)
at java.net.URL.<init>(URL.java:376)
at java.net.URL.<init>(URL.java:330)
at EntityVersionComparator.newClassLoader(EntityVersionComparator.java:143)
at EntityVersionComparator.test(EntityVersionComparator.java:88)
at EntityVersionComparator.main(EntityVersionComparator.java:74)
WHATS GOING ON..Is there something wrong with the path?Pls advise
jason

I also in my CODE have:
private ClassLoader newClassLoader(String path)
throws MalformedURLException
{ URL url = new URL(path);
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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

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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.
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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.

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Hi all.
I have a program written with Swing. This program has one button and fetch Image into this button. Image is in Images directory .When I run this program by IDE, It's OK. However, when I compress classes of this program into Jar file and run, it can not recognize the path to Image. And it leads to this error:
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Hi everybody
I make a jar file using Jbuilder;my application interact with oracle and when i try to run it ,I get the following message:
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Help dealing with jar file

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