Not a bug in DaCapo, but a documented bug in jython, and visible as at 9.12 bach.
We won't fix this, since it is an upstream problem, but we should be sure to update jython as soon as the bug is fixed there.
/opt/jdk1.6.0_20/bin/java -Xcomp -jar dacapo-9.12-bach.jar jython
===== DaCapo 9.12 jython starting =====
Traceback (most recent call last):
File "/home/steveb/./scratch/jython/pybench/pybench.py", line 38, in <module>