Hi, I am working on the bug 6901992. I have already fixed the merge method and I have created a test case for it too. Nevertheless, I was unable to reproduce the bug as a whole (using the ClassLoader mechanism) and get the InvalidJarIndexException, since the only way I might think of triggering the error is using an invalid index (INDEX.LIST), which does not make sense. I am triying to reproduce the bug using the URLClassLoader but maybe there is a different usage pattern implemented in the com.sun.deploy.cache classes. Where I can find the source files of that package? In addition, I could not find documentation or specification about how the classloader should process the INDEX.LST. For instance, it was a surprise for me that a jar listed in the INDEX.LIST was included by the classloader without an explicit listing in the classpath. Is there any specification for this? Thanks, Diego