How to analyze information from a Java core dump

Question

If a process crashes and leaves a core dump or I create one with gcore then how can I analyze it    I d like to be able to use jmap  jstack  jstat etc and also to see values of all variables    This way I can find the reasons for a crashed or frozen JVM

User · Answer

See http   www oracle com technetwork java javase tsg-vm-149989 pdf   You can use  jdb  directly on the core file

User · Answer

Maybe VisualVM can help  haven t yet had a chance to try it myself    Link   http   java sun com javase 6 docs technotes guides visualvm coredumps html

User · Answer

Are you sure a core dump is what you want here  That will contain the raw guts of the running JVM  rather than java-level information  Perhaps a JVM heap dump is more what you need

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I recommend you to try Netbeans Profiler It has rich set of tools for real time analysis  Tools from IbM are worth a try for offline analysis

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Try the lady4j stack analyzer  it could help you   http   www lady4j com solveStack jsp

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IBM provide a number of tools which can be used on the sun jvm as well  Take a look at some of the projects on alphaworks  they provide a heap and thread dump analyzers  Karl

User · Answer

Okay if you ve created the core dump with gcore or gdb then you ll need to convert it to something called a HPROF file   These can be used by VisualVM  Netbeans or Eclipse s Memory Analyzer Tool  formerly SAP Memory Analyzer    I d recommend Eclipse MAT   To convert the file use the commandline tool jmap     jmap -dump format b file dump hprof  usr bin java core 1234   where   dump hprof is the name of the hprof file you wish to create   usr bin java is the path to the version of the java binary that generated the core dump  core 1234 is your regular core file

User · Answer

jhat is one of the best i have used so far To take a core dump I think you better use jmap and jps instead of gcore i haven t used it  Check the link to see how to use jhat  http   www lshift net blog 2006 03 08 java-memory-profiling-with-jmap-and-jhat

User · Answer

If you are using an IBM JVM  download the IBM Thread and Monitor Dump Analyzer  It is an excellent tool  It provides thread detail and can point out deadlocks  etc  The following blog post provides a nice overview on how to use it

User · Answer

Actually  VisualVM can process application core dump    Just invoke  File Add VM Coredump  and will add a new application in the application explorer  You can then take thread dump or heap dump of that JVM

[java] How to analyze information from a Java core dump?

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