Question

I’m using ASANT to run a xml file which points to a NARS.jar file.

I’m getting “java.lang.OutOfMemoryError: Java heap space” and i’m researching around this.

So i have found that i need to set “-XX:+HeapDumpOnOutOfMemoryError”, to create a dump file to analyze.

I edited ASANT.bat and added the “-XX:+HeapDumpOnOutOfMemoryError” to ANT_OPTS:

set ANT_OPTS= "-XX:+HeapDumpOnOutOfMemoryError" "-Dos.name=Windows_NT" "-Djava.library.path=%AS_INSTALL%\lib;%AS_ICU_LIB%;%AS_NSS%" "-Dcom.sun.aas.installRoot=%AS_INSTALL%" "-Dcom.sun.aas.instanceRoot=%AS_INSTALL%" "-Dcom.sun.aas.instanceName=server" "-Dcom.sun.aas.configRoot=%AS_CONFIG%" "-Dcom.sun.aas.processLauncher=SE" "-Dderby.root=%AS_DERBY_INSTALL%"  

But i can’t seem to find any dump file.
I will use the Eclipse Memory Analyzer to analyze when i find the dump.

I also tried to set the option “-XX:HeapDumpPath=c:\memdump\bds.hprof”, but no dump was created there.

Anyone got an idea of what i’m doing wrong?
Thanks in advance

Answer 1

I found that i could use VisualVM from SUN to get a heapdump, and see it live.

Easy solution