Hi, Not always but often, the error "Assertion `temp == string' failed" occurs when runnig h2 database (http://www.h2database.com/). $ kaffe -cp ../h2/bin/h2.jar org.h2.tools.Server -tcp -tcpAllowOthers true -log true kaffe-bin: string.c:373: stringInternString: Assertion `temp == string' failed.