java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)


This is a resubmission of the bug following a review (ID 111906). I disagree
with the reviewer's conclusion that this is a duplicate of bug 4110602.

Since the submission, I hunted around a bit in the sources and found that the
source of the bug is the inability of java.net.JarURLConnection to handle
nested jars. There is a comment to that effect in the source.

I believe this bug can be easily fixed without impact. I can post a patch if so
desired.

ORIGINAL BUG REPORT
Say I have a jar, called setup.jar, which contains another jar, app.jar. Here's
the layout:

setup.jar
 +--META-INF
 |  |
 |  \MANIFEST.MF
 |
 +--Bootstrap.class
 |
 \--app.jar
    |
    +--META-INF
    |  |
    |  \MANIFEST.MF
    |
    \--App.class

NOTE: The manifest does not contain a Class-Path: directive. I handle the class
path explicitly by creating a new ClassLoader.

Now I'd like Bootstrap to locate app.jar using Class.getResource(), create a
URLClassLoader using the resulting URL, locate App.class using
ClassLoader.loadClass(), and invoke its main() method. But this fails with an
exception:

Exception in thread "main" java.lang.ClassNotFoundException: App
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
        at Bootstrap.main(Bootstrap.java:13)

Here are the sources used:

--------Bootstrap.java-----------

import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;

public class Bootstrap {

	public static void main(String[] args) throws Exception {
		URL app = Bootstrap.class.getResource("/app.jar");
		//URL app = new URL("file:/C:/users/avik/cms/Tip/app.jar");
		System.out.println("app path: " + app);
		ClassLoader loader = new URLClassLoader(new URL[] { app });
		Class entry = loader.loadClass("App");
		Class[] argTypes = new Class[] { new String[0].getClass() };
		Method main = entry.getMethod("main", argTypes);
		main.invoke(null, new Object[] { args } );
	}

}
--------end--------------

-------App.java--------
public class App {
	public static void main(String[] args) {
		System.out.println("Hello, world");
	}
}
--------end-----------

-----app.manifest-------
Manifest-Version: 1.0
Main-Class: Bootstrap
--------end-------------

------testpackage.bat-----------
javac Bootstrap.java App.java
jar c0f app.jar App.class
jar c0mf app.manifest setup.jar app.jar Bootstrap.class
java -jar setup.jar
---------end-----------------

Create all files as specified and run testpackage.bat.
(Review ID: 111955) 
======================================================================
Posted Date : 2006-02-06 23:31:44.0

Extract app.jar into a temporary location.
======================================================================

N/A

 I have created a JAR in which i included a frame class and
specified Main-class in its menifest file.when i run it 
through java -jar file.jar it runs fine. now i want to run 
it through JarRunner. so i put This JAR into LIb folder of
 JvaWebServer2.0. When i am Runnig it at command prompt 
through 
java JarRunner http://localhost:8080/filename.jar I got 
file not found exception. help me 

I have a similar problem for a diffrent application:
I want to access files in a jar file which is again in jar file, by using URL (e.g. for images):
jar:jar:http://example.com/example.jar!/exampleInExample.jar!/TheRealExampe.jpg
Because in java.net.JarURLConnection.parseSpecs(URL url) the indexOf("!") is used,
instead of lastIndexOf("!") I get a:
"java.net.MalformedURLException: java.lang.NullPointerException: no !/ in spec"
when he is trying to retrieve the second Jar-Handler.
(StackTrace:
	at java.net.URL.<init>(URL.java:496)
	at java.net.URL.<init>(URL.java:376)
	at java.net.URL.<init>(URL.java:330)
	at java.net.JarURLConnection.parseSpecs(JarURLConnection.java:158)
	at java.net.JarURLConnection.<init>(JarURLConnection.java:141)
	at sun.net.www.protocol.jar.JarURLConnection.<init>(JarURLConnection.java:64)
	at sun.net.www.protocol.jar.Handler.openConnection(Handler.java:27)
	at java.net.URL.openConnection(URL.java:781)
	at java.net.URL.openStream(URL.java:798)
)
Seems to be the same bug. If not, I would like to be informed about it.

This is a bug in JDK 1.3.1 (Win2K SP1) too.  Also a bug if "jar:file:" protocol used.- PJH

bug!

Rob
robofife@earthlink.net

I have had a problem loading a chat window on my 
PowereMac 8550. It worked about 2 weeks ago and 
now does not. I get the message "A Connection has 
failed" and I can tell that this occurs when the Applet 
loads cecause it says "Applet Loading" and then 
"Applet Closed" just before the Connection fails.

The java message reads:

An exception occurred:
java.lang.ClassNotFoundException: 
	at 
com.apple.mrj.JManager.JMAppletClassLoader_IMPL.l
oadClass(JMAppletClassLoaderOld.java)
	at 
com.apple.mrj.JManager.JMAppletClassLoader_IMPL.l
oadClass(JMAppletClassLoaderOld.java)
	at 
com.apple.mrj.JManager.JMAppletClassLoader_ROOT
.loadClass(JMAppletClassLoaderOld.java)
	at 
com.apple.mrj.JManager.JMAppletViewer_OLD.doLoad
Code(JMAppletViewerOld.java)
	at 
com.apple.mrj.JManager.JMAppletViewer_OLD.setStat
e(JMAppletViewerOld.java)
	at 
com.apple.mrj.JManager.JMViewerEvent.post(JMApplet
ViewerOld.java)
	at 
com.apple.mrj.JManager.AVDispatcherThread.run(JMA
ppletViewerOld.java)
Java Exception: java.lang.NullPointerException - 
Stack Trace:
java.lang.NullPointerException
	at 
java.awt.LightweightDispatcher.stopListeningForOther
Drags(Container.java)
	at 
java.awt.LightweightDispatcher.dispose(Container.java
)
	at java.awt.Container.removeNotify(Container.java)
	at java.awt.Window.dispose(Window.java)
	at java.awt.Frame.dispose(Frame.java)
	at 
com.apple.mrj.JManager.JMAppletViewer_OLD.setStat
e(JMAppletViewerOld.java)
	at 
com.apple.mrj.JManager.JMViewerEvent.post(JMApplet
ViewerOld.java)
	at 
com.apple.mrj.JManager.AVDispatcherThread.run(JMA
ppletViewerOld.java)


This is just part of it but I hope you get the jist. Please 
help me if you can. I have tried all that I know and I am 
desperate.

Sincerely,
Rob

Similar probs with me too

I fail to see how this is a duplicate of 4418643. 4418613 is an enhancement request and it may require to build upon this bug fix, but this is surely not a duplicate of that bug. Very weired.