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From Andrea Leistra <Andrea.Leis...@concur.com>
Subject Problems with example Python UDF
Date Tue, 10 May 2011 19:43:38 GMT
I am having problems getting the simple example Python UDFs from http://wiki.apache.org/pig/UDFsUsingScriptingLanguages
to work.    Stack trace:


Pig Stack Trace
---------------
ERROR 2998: Unhandled internal error. org/python/util/PythonInterpreter

java.lang.NoClassDefFoundError: org/python/util/PythonInterpreter
        at org.apache.pig.scripting.jython.JythonScriptEngine$Interpreter.<clinit>(JythonScriptEngine.java:54)
        at org.apache.pig.scripting.jython.JythonScriptEngine.registerFunctions(JythonScriptEngine.java:105)
        at org.apache.pig.PigServer.registerCode(PigServer.java:507)
        at org.apache.pig.tools.grunt.GruntParser.processRegister(GruntParser.java:381)
        at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:421)
        at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:165)
        at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:141)
        at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:90)
        at org.apache.pig.Main.run(Main.java:510)
        at org.apache.pig.Main.main(Main.java:107)
Caused by: java.lang.ClassNotFoundException: org.python.util.PythonInterpreter
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
        ... 10 more
================================================================================

>From what I have been able to see in the archives the most common cause of this error
seems to be that jython.jar is not in the classpath; I've checked and mine is in the classpath.
 I have the full path to both jython.jar and test.py in the pig script.     Are there other
causes that might produce this error?    Python is in /usr/local/bin rather than /usr/bin;
would that produce this, and if so how would I address the error?

Thanks,
Andrea Leistra

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