Getting Core dump on getting environment variable

I first found this problem trying to display my GUI in jdk1.5.0_05. I have located it to be core dumping in the JNI C code for getting the envrionment, specifically Java_java_lang_ProcessEnvironment_environ.
I wrote some test code to just call System.getenv() which is the java call that calls this piece of JNI code. If I run my Java code from the command line using the java command and it works just fine. Unfortunately the real code cannot be run this way since it is a plugin to a C++ application. The application starts up the JVM which I then retrieve and execute my Java code. They are using Sun's libjvm.so and libjava.so in the jre directory for the JVM. When I run my test code as a plugin to the app, I core dump.
Can someone provide me insight into what the java_java_lang_ProcessEnvironment_environ function is doing so that I can further debug my problem. Is the source code for this function available? I am sure it is not a problem with Java, but I do not understand what is going on here to cause this to stop working within the other application as a plugin versus running on it's own.
Kevin

Well after doing more research I found that the environ extern variable is null. This is causing the core dump. If I set this variable to an environ[0][0] = '\0'; I no longer get my core dump in Java. I also though no longer get me GUI to appear. Is there something in the environment that is needed to display GUIs?

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    4a6a3000-4a6a5000 rw-p 0000d000 03:02 2093122 /lib/libresolv-2.2.4.so
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    Warning: checksum in file(1a8d) doesn't match image(b1ea)
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    Reading libm.so.1
    Reading libdl.so.1
    Reading libelf.so.1
    Reading libsocket.so.1
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    Reading libifglx.so
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    Reading libCrun.so.1
    Reading libw.so.1
    Reading libmp.so.2
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    [12] IPCService::mainLoop(pMediator = 0x1172d0, pHandler = 0xf9c28), line 51 in "IPCService.cc"
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