[dacapobench-researchers] Some notes on building jython

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Hi,
just a heads up for anyone searching the archives.

Ant has an optional jython task. I happened to use an ant script which
automatically puts all dependency jars onto the classpath, which
resulted in some jython 2.2 classes conflicting with the 2.5 code. The
build failed with errors like:
     [exec]     [javac]
/nfs/home/home1/dmohr/src/dacapo-9.10-beta2/benchmarks/bms/jython/build/src/org/python/modules/_weakref/AbstractReference.java:2:
package org.python.modules._weakref clashes with class of same name
     [exec]     [javac] package org.python.modules._weakref;
     [exec]     [javac] ^

Using a fresh ant install / script solved the problem. Take care
though that dacapo's build system invokes the shell command 'ant' - so
running dacapo's build.xml with the working ant command is not enough,
it also has to be available through $PATH.

~David

P.S. Running the ant script could probably be replaced by the ant
task, but I have not looked further into such a change.