Hi,
I tried running two java applications: JFLAP (http://jflap.org) and kara (http://www.oberstufeninformatik.de/info11/javakara.html).
JFLAP crashed with a NullPointerException and kara with the message
*** glibc detected *** free(): invalid pointer: 0x083c6f90 ***
Both apps run file in Muppy 007-212.
puppy 2.13, java 1.5.0_6
SOLVED: puppy 2.13, java 1.5.0_6
I just installed java 1.5.0_8 and JFLAP and Kara run fine. Thanks to MU for the tip.