Saturday, May 31, 2008

Stanford Parser Gotcha

I have aged 6 years since I last coded in Java. So I wasn't quite sure what to make of this Stanford Parser error in the NLP summer school lab. For a while I was quite sure that I didn't set the Java CLASSPATH properly and thus the parser is spewing blood and gore all over me. But after a hour of mucking around I realised that it wasn't so. The real problem seems to that the parser doesn't seem to run well with gij .

$ gij --version gij (GNU libgcj) version 3.4.6 20060404 (Red Hat 3.4.6-3)

$ ./lexparser.csh Warning: -server not understood. Ignoring. Warning: -mx150m not understood. Ignoring. Exception in thread "main" java.lang.ClassFormatError: edu.stanford.nlp.parser.lexparser.LexicalizedParser (erroneous method access flags) at _Jv_ClassReader.throw_class_format_error(byte) (/usr/lib/ at _Jv_ClassReader.handleMethod(int, int, int, int) (/usr/lib/ at _Jv_ClassReader.read_methods() (/usr/lib/ at _Jv_ClassReader.parse() (/usr/lib/ at _Jv_DefineClass(java.lang.Class, byte[], int, int) (/usr/lib/ at java.lang.VMClassLoader.defineClass(java.lang.ClassLoader, java.lang.String, byte[], int, int, (/usr/lib/ at java.lang.ClassLoader.defineClass(java.lang.String, byte[], int, int, (/usr/lib/ at, byte[], int, int, (/usr/lib/ at (/usr/lib/ at gnu.gcj.runtime.VMClassLoader.findClass(java.lang.String) (/usr/lib/ at java.lang.ClassLoader.loadClass(java.lang.String, boolean) (/usr/lib/ at _Jv_FindClass(_Jv_Utf8Const, java.lang.ClassLoader) (/usr/lib/ at java.lang.Class.forName(java.lang.String, boolean, java.lang.ClassLoader) (/usr/lib/ at java.lang.Class.forName(java.lang.String) (/usr/lib/ at (/usr/lib/ at _Jv_ThreadRun(java.lang.Thread) (/usr/lib/ at _Jv_RunMain(java.lang.Class, byte const, int, byte const, boolean) (/usr/lib/ at __gcj_personality_v0 (/home/iasnlp2008/Desktop/stanford-parser-2007-08-19/java.version=1.4.2) at __libc_start_main (/lib/tls/ at _Jv_RegisterClasses (/home/iasnlp2008/Desktop/stanford-parser-2007-08-19/java.version=1.4.2)

To test my hunch I changed machines and tried with other version of Java (viz 1.5.x) and it worked without a breaking a sweat. Except for the minor problems like this mistake in script the exparser-gui.csh on line $scriptdir/stanford-parser.jar: everything seems to be alright so far.

$ java -version java version "1.5.0_05" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_05-b05) Java HotSpot(TM) Server VM (build 1.5.0_05-b05, mixed mode)

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