Out of Memory - web applications

Question

I am trying to figure out why Jetty 6.1.22 is running out of memory on my laptop. I have 2 web applications running JBoss Seam, Hibernate (with EHCache), and separate Quartz scheduler instances.

With little load, the server dies throwing OutOfMemory.

What can I look for? Would you think that I am not properly closing handles for input streams or files?

I tried profiling my application with Netbeans, but it works off and on. Usually, it ends up locking up even though it doesn't use that much CPU or memory.

Walter

Answer 1

What are you JVM's execution parameters?

Try increasing available heap memory though -Xms (default) -Xmx (max) and -Xmn (min) JVM's flags.

You can also monitor your Application Server execution with JConsole . It's usually helpful for finding out where is you application leaking.

Answer 2

add -XX:+HeapDumpOnOutOfMemoryError when invoking the jvm and when you get the OOM situation you will get a .hprof file dumped. You can open it later with several tools and you'll be able to see where the memory is going...

The tool I use is Eclipse Memory Analyzer , it's pretty good.

Answer 3

I can strongly recommend attaching to the troublesome program with jvisualvm in the JDK.

This allows you to investigate memory and cpu usage over time and inspect what happens in general.