wisconsin.java test failed in DerbyNet or DerbyNetClient frameworks, VM for network server got OutOfMemoryError

The wisconsin test failed on some Solaris (sparc) platforms during testing of the 10.2.0.4 snapshot, in either the DerbyNet or DerbyNetClient framework.

No output in the outfile. On some platforms the DerbyNet.err file has one message:

Exception in thread "Thread-2" java.lang.OutOfMemoryError: Java heap space

On some platforms the OutOfMemoryError is also (or instead) reported in the derby.log file.
All test machines had 2 CPUs and 2 GB of RAM.

Here is a list of platforms where it failed:

Java 6 (Mustang, build 91) :
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Solaris 10 (sparc)
derbyall/derbynetmats/derbynetmats.fail:lang/wisconsin.java

Solaris 8 (sparcN-2)
derbyall/derbynetmats/derbynetmats.fail:lang/wisconsin.java

Solaris 10, local zone (sparc_zone1)
derbyall/derbynetmats/derbynetmats.fail:lang/wisconsin.java

Solaris 10, local zone (sparc_zone3)
derbynetclientmats/derbynetmats/derbynetmats.fail:lang/wisconsin.java

Solaris 10, global zone (zones)
derbynetmats/derbynetmats.fail:lang/wisconsin.java

Java 5 (Sun's HotSpot VM, v1.5.0):
---------------------------------------------------------------

Solaris 9 (sparcN-1)
derbyall/derbynetclientmats/derbynetmats.fail:lang/wisconsin.java

Solaris 8 (sparcN-2)
derbyall/derbynetmats/derbynetmats.fail:lang/wisconsin.java

See http://www.nabble.com/10.2.0.4-Test-results-p5485739.html for details.