Monday Feb 11, 2008

CR 6454676

This fix for CR 6454676 (Need -XX:+HeapDumpOnCtrlBreak to trigger heap dump on ctrl-break or ctrl-\\) was made available in 1.4.2_18 and 5.0u14. But a format string used in this fix got currupted due to SCCS mis-interpretation and caused the following bug.

6615248: SCCS tag interpetation makes code invalid

And due to this regression, HeapDumpOnCtrlBreak does not work correctly in 5.0u14. This problem has been fixed in 1.4.2_18 and 5.0u17.

Tuesday Dec 04, 2007

Heap Dump using -XX:+HeapDumpOnCtrlBreak

Heap Dumps are useful for Java Object Heap analysis. HeapDumpOnCtrlBreak jvm option would be available in upcoming 5.0 and 1.4.2 update releases that can be used to dump heap when a SIGQUIT signal is sent to the running process. One more feature would be available - if this option is used along with -XX:+PrintClassHistogram then both these tasks will be performed in one single VM Operation so that the Class Histogram and the Heap Dump represent the same snapshot of the process.

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