[jython.jar] Got java.lang.ExceptionInInitializerError while initializing PythonInterpreter

Hi all,

I am trying to use Python objects in a NetBeans Java project, but
failed at the very beginning.

At first, I tried to use PlyJy (https://kenai.com/projects/plyjy)
which provides JythonObjectFactory, but it failed to create Jython
object. In order to debug, I tried to paste the sample Java code on
jythonbook to my Java program instead.

    http://www.jython.org/jythonbook/en/1.0/JythonAndJavaIntegration.html#making-use-of-a-loosely-coupled-object-factory

Then I found that it fails while creating PythonInterpreter object.

    PythonInterpreter interpreter = new PythonInterpreter();

I tried jython 2.5.3, 2.5.4-rc1, 2.7-b3. All of them gave the same
result -- I always got java.lang.ExceptionInInitializerError while
creating PythonInterpreter.

Then, I downloaded jython source and built a jython-dev.jar for
debugging and found that the exception results from the following
lines in Version::loadProperties() which is called in static init
block of Version:

    final String versionProperties = "/org/python/version.properties";
    InputStream in = Version.class.getResourceAsStream(versionProperties);

Version.class.getResourceAsStream() fails to get
"/org/python/version.properties" and returns null which in turn causes
Version object failed to construct and throws an exception.

"/org/python/version.properties" is indeed inside jython-dev.jar. I
don't understand why getResourceAsStream() fails.

I guessed this might be something like CLASSPATH settings or other
environment issue, so I tried to add jython.jar in CLASSPATH and tried
different environments (NetBeans 8.0.2 on Ubuntu, NetBeans 7.4 on
Windows) but still got the same result.

Any suggestion is appreciated.

Thanks,
Po-Yu

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