Using HeapDumpOnOutOfMemoryError parameter for heap dump for JBoss

Question

I was told I can add the -XX  HeapDumpOnOutOfMemoryError parameter to my JVM start up options to my JBoss start up script to get a heap dump when we get an out of memory error in our application   I was wondering where this data gets dumped   Is it just to the console  or to some log file   If it s just to the console  what if I m not logged into the Unix server through the console

User · Answer

If you are not using  -XX HeapDumpPath  option then in case of JBoss EAP As by default the heap dump file will be generated in  JBOSS HOME bin  directory

User · Answer

I found it hard to decipher what is meant by  working directory of the VM    In my example  I was using the Java Service Wrapper program to execute a jar - the dump files were created in the directory where I had placed the wrapper program  e g  c  myapp bin   The reason I discovered this is because the files can be quite large and they filled up the hard drive before I discovered their location

User · Answer

Here s what Oracle s documentation has to say      By default the heap dump is created in   a file called java pid hprof in the   working directory of the VM  as in the   example above  You can specify an   alternative file name or directory   with the -XX HeapDumpPath  option  For   example -XX HeapDumpPath  disk2 dumps   will cause the heap dump to be   generated in the  disk2 dumps   directory

User · Answer

You can view this dump from the UNIX console   The path for the heap dump will be provided as a variable right after where you have placed the mentioned variable   E g    -XX  HeapDumpOnOutOfMemoryError -XX HeapDumpPath   DOMAIN HOME  logs mps    You can view the dump from the console on the mentioned path

[java] Using HeapDumpOnOutOfMemoryError parameter for heap dump for JBoss

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