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Date: Wed, 9 Mar 2011 17:15:12 +0100
Subject: real reason for java.lang.NoClassDefFoundError ?
From: "Anton Korosov" <anton.korosov@nersc.no>
To: pylucene-dev@lucene.apache.org
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Hello!

I'm trying to use BEAM/Visat software in Python. It is a large project
with > 100 JARs. I try to 'convert' these JARs into Python specifying each
after --jar option:
python -m jcc.__init__ \
--python testbeam \
--jar /host/local/beam-4.8/modules/beam-landsat-reader-1.2.1.jar \
--jar /host/local/beam-4.8/modules/beam-meris-boreal-lakes-1.4.2.jar \
--jar /host/local/beam-4.8/modules/beam-meris-case2-core-1.4.2.jar \
--jar /host/local/beam-4.8/modules/beam-meris-case2-regional-1.4.2.jar \
--jar /host/local/beam-4.8/modules/beam-meris-cloud-1.5.203.jar \
--jar /host/local/beam-4.8/modules/beam-meris-eutrophic-lakes-1.4.2.jar \
--jar /host/local/beam-4.8/modules/beam-merisl3-reader-1.1.jar \
...

However I immediately got error:
While loading com/jidesoft/lucene/c$1
Traceback (most recent call last):
  File "/usr/lib/python2.6/runpy.py", line 122, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.6/runpy.py", line 34, in _run_code
    exec code in run_globals
  File
"/usr/local/lib/python2.6/dist-packages/JCC-2.7-py2.6-linux-x86_64.egg/jcc/__init__.py",
line 32, in <module>
    import jcc.__main__
  File
"/usr/local/lib/python2.6/dist-packages/JCC-2.7-py2.6-linux-x86_64.egg/jcc/__main__.py",
line 98, in <module>
    cpp.jcc(sys.argv)
  File
"/usr/local/lib/python2.6/dist-packages/JCC-2.7-py2.6-linux-x86_64.egg/jcc/cpp.py",
line 501, in jcc
    cls = findClass(className.replace('.', '/'), iii)
  File
"/usr/local/lib/python2.6/dist-packages/JCC-2.7-py2.6-linux-x86_64.egg/jcc/cpp.py",
line 73, in findClass
    cls = _findClass(className)
jcc.cpp.JavaError: java.lang.NoClassDefFoundError:
org/apache/lucene/queryParser/QueryParser
Java stacktrace:
java.lang.NoClassDefFoundError: org/apache/lucene/queryParser/QueryParser
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
	at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Caused by: java.lang.ClassNotFoundException:
org.apache.lucene.queryParser.QueryParser
	at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
	... 11 more

Why is that? Does that mean that the class com/jidesoft/lucene/c$1 has
reference to a class org/apache/lucene/queryParser/QueryParser but the
latter is not given in any JAR?

How can such situation occur if Beam/Visat works perfectly? Could it be
that Beam/Visat simply don't call
org/apache/lucene/queryParser/QueryParser ?

What should I do? Download a JAR with
org/apache/lucene/queryParser/QueryParser or rather --exclude
com/jidesoft/lucene/c ? Will it influence performance of the Python
module?

Thank you very much for any ideas/suggestions!
Anton