tomcat - Java "Out of memory error" - heap/system - where to look? -


in tomcat application getting "out of memory" , "cannot allocate memory" errors. suppose nothing heap fulls system memory , hardly able run bash commands.

how problem connected heap? how can correctly set heap size application has enough memory , not consume of system resources?

strange thing "top" command keeps saying tomcat consumes 20% of mem , there still free memory, once problem happens.

thanks.

edit:

follow-up: bufferedimage leaks - there alternatives?

problems running bash scripts may indicate i/o issues, , might case if jvm doing full gcs time (which case, if heap almost-full).

the first thing do, increase heap -xmx. may solve problem, or - if have memory leak, won't, , outofmemoryerror again.

in case, need analyze memory dumps. see my answer in thread instructions.

also, might useful enable garbage collection logs (using -xloggc:/path/to/log.file -xx:+printgcdetails) , analyzing them gcviewer or hpjmeter.


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