Recently I updated j2eetck-mods and javaee5-cts to the most recent versions in CVS head. I installed TCK 5_0b, rebuilt everything and ran the suite. I found out every test was failing because the VM was exiting with code 1. I removed TCK 5_0b and tried again with 5_0_tempb-b06. Same problem. I am running everything in Windows. Apparently the harness executes a badly formatted command, shown below. Note the java command appears after the class name and other options. com.sun.ts.lib.harness.ExecTSTestCmd CLASSPATH=[list of ';' separated paths] DISPLAY=:0.0 HOME=C:\Documents and Settings\aguizar windir=C:\WINDOWS SYSTEMROOT=C:\WINDOWS PATH=\dev\jbossas\trunk\build\output\jboss-5.0.0.Beta2\nativelib C:\dev\jdk1.5.0_10\jre/bin/java -DTS_HOME=C:\dev\tck5\javaeetck Are you hitting this problem as well? Where can I read about changes to j2eetck-mods? Thanks, Alejandro