I installed jdk1.2 v2 on RH6 and everything worked until I tried jdb. It (jdb) kind of worked if I did not set any break points. (the program prints "Hello world" then exits, but jdb reports "1" is not a valid thread id) If I set a break point (stop in test.main) then run, the following error occurs: Breakpoint hit: [Internal debugger error: unexpected eof] java.lang.InternalError at sun.tools.debug.RemoteAgent.error(RemoteAgent.java:1409) at sun.tools.debug.RemoteAgent.getReply(RemoteAgent.java:553) at sun.tools.debug.RemoteAgent.dumpStack(RemoteAgent.java:691) at sun.tools.debug.RemoteThread.getStack(RemoteThread.java:278) at sun.tools.debug.RemoteThread.dumpStack(RemoteThread.java:129) at sun.tools.ttydebug.TTY.breakpointEvent(TTY.java:80) at sun.tools.debug.AgentIn.run(AgentIn.java:75) at java.lang.Thread.run(Thread.java:479) Reaped pid = 5580, status = 0 [Internal debugger error: unexpected eof] Exception in thread "main" java.lang.InternalError at sun.tools.debug.RemoteAgent.error(RemoteAgent.java:1409) at sun.tools.debug.RemoteAgent.getReply(RemoteAgent.java:553) at sun.tools.debug.RemoteAgent.listThreads(RemoteAgent.java:640) at sun.tools.debug.RemoteThreadGroup.listThreads(RemoteThreadGroup.java:66) at sun.tools.ttydebug.TTY.indexToThread(TTY.java:35) at sun.tools.ttydebug.TTY.setThread(TTY.java:260) at sun.tools.ttydebug.TTY.run(TTY.java:322) at sun.tools.ttydebug.TTY.executeCommand(TTY.java:1578) at sun.tools.ttydebug.TTY.<init>(TTY.java:1680) at sun.tools.ttydebug.TTY.main(TTY.java:1809) Can anyone help? Walter ---------------------------------------------------------------------- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]