JVM complains on GCAM launch about java.system.class.loader property

[MincingWords]

I've got GCAM 6.0 built on Gentoo Linux but I'm running into a problem when I try to run it:

OpenJDK 64-Bit Server VM warning: Archived non-system classes are disabled because the java.system.class.loader property is specified (value = "WildcardExpandingClassLoader"). To use archived non-system classes, this property must not be set
SEVERE ERROR:Failed to find Java class XMLDBDriver to write to the XML database.

I suspect the two things are related - specifically, the former is causing the latter.

Line 320 of .../objects/reporting/source/xml_db_outputter.cpp says this

options[ 1 ].optionString = const_cast<char*>( "-Djava.system.class.loader=WildcardExpandingClassLoader" );

so that is apparently where the property is being set.

Meanwhile, XMLDBDriver.jar is in /opt/gcam-core-gcam-v6.0/exe and my user CLASSPATH is set to

/opt/gcam-core-gcam-v6.0/exe/*:/opt/gcam-core-gcam-v6.0/cvs/objects/java/source/*

so if I'm understanding this correctly the XMLDBDriver class ought to be getting picked up and I assume would be if not for the setting of the java.system.class.loader property.

I figured I'd better put something about this here instead of just screwing around with xml_db_outputter.cpp and rebuilding because I really don't know how to change it to make everything happy. Advice?