This is with JDK 1.2 beta-3 build "I".

When I try to run two copies of the same applet on one page,
I consistently get failures with "java.lang.ClassFormatError: Duplicate name"
See a typical stack trace below.

It looks like the classloaders are trying to load the same JAR classes at
the same time and getting conflicts internally.

There is a test case online at http://zebadee/test/12A
Do "appletviewer http://zebadee/test/12A" to reproduce the problem

zebadee[486]> appletviewer http://zebadee/test/12A
java.lang.ClassFormatError: Duplicate name
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:360)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:101)
        at sun.applet.AppletClassLoader.defineClass(AppletClassLoader.java:155)
        at sun.applet.AppletClassLoader.findLocalClass(AppletClassLoader.java:94)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:246)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:185)
        at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:255)
        at sun.applet.AppletPanel.createApplet(AppletPanel.java:459)
        at sun.applet.AppletPanel.runLoader(AppletPanel.java:395)
        at sun.applet.AppletPanel.run(AppletPanel.java:234)
        at java.lang.Thread.run(Thread.java:490)

KGH 3/1/98