Re: [Jython-dev] Null pointer exception in Demo/embed/SimpleEmbedded...

[<bc...@wo...>]

[Jayson S Baird]

>Hiho,
>
>   I'm a developer who is trying to embed Python code into Java, so of
>course I came to Jython. When trying to run your example after compiling,
>I get the following stack dump:
>  Exception in thread "main" java.lang.NullPointerException
>   at org.python.core.PyJavaClass.lookup(PyJavaClass.java:39)
>   at org.python.core.PyObject.<init>(PyObject.java:46)
>   at org.python.core.PySingleton.<init>(PySingleton.java:8)
>   at org.python.core.PyNone.<init>(PyNone.java:7)
>   at org.python.core.PySystemState.initStaticFields(PySystemState.java:341)
>   at org.python.core.PySystemState.initialize(PySystemState.java:320)
>   at org.python.core.PySystemState.initialize(PySystemState.java:294)
>   at org.python.core.PySystemState.initialize(PySystemState.java:287)
>   at org.python.util.PythonInterpreter.<init>(PythonInterpreter.java:61)
>   at org.python.util.PythonInterpreter.<init>(PythonInterpreter.java:45)
>   at SimpleEmbedded.main(SimpleEmbedded.java:6)
>
>Any idea what's causing this? no one has mentioned it in the FAQ's or the
>list archives...

It works for me:

d:\java\jython-2.0\demo\embed>echo %CLASSPATH%
d:\java\jython-2.0\jython.jar;.

d:\java\jython-2.0\demo\embed>i:\java\jdk1.3\bin\java.exe SimpleEmbedded
Hello, brave new world
sys module
42
x: 4
Goodbye, cruel world

d:\java\jython-2.0\demo\embed>

More info is needed about your platform, software version and env-vars
before we can give any advice about the situation you are seeing.

regards,
finn