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Editorial Team
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Asked: 2026-05-24T17:01:58+00:00

I got a server running a Java application on OpenJDK and CentOS . However

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I got a server running a Java application on OpenJDK and CentOS.

However the application seems to have a memory leak and crashes every few weeks.
The problem is that although HeapDumpOnOutOfMemoryError is specified no heap dump is generated.
If i create an artificial memory leak which crashes the application immediately a proper heap dump is generated.

Now i’m not asking for a complete solution to this problem but for a good strategy.

Is there a way to pull a heap dump on demand while the application is running after a week for example? Is there a way to figure out whats going wrong in OpenJDK? Do you got any alternative suggestions on how to approach this?

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  1. Editorial Team

    OpenJDK should contain a tool called jmap which can create a heap dump given a process id. For the exact syntax you would have to look at the jmap man page. If there is a memory leak then this should be visible in the heap dump even before the app crashes. I can also recommend the eclipse memory analyzer to browse the heap dump and get a list of leak suspects.

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