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javaheap-dump

How do I inspect specifically what Java strings are being kept around, causing memory leak?

I can see in the heapdump file that the String class exhausted memory, but how do I know specifically what those strings are?

Solution

  • If you use VisualVM you can use couple of OQL query to read the data in Java heap that you are looking for. One command that may suit your need is:

     select {instance: s, content: s.toString()} from java.lang.String s
    where /java/(s.toString())

    you can find a lot more here: https://visualvm.github.io/documentation.html, section Analyzing a Heap Dump Using OQL