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javajvmmigrationout-of-memory
Tavo
Tavo

Reputation: 3151

Metaspace throwing OutOfMemoryException

I have recently migrated from Java7 to Java8. This has caused an issue where I get OutOfMemoryException after a few hours because the GC can't free any memory. Also, the Last Ditch Collection can't resize the Metaspace to anything bigger.

I am quite convinced that this is an issue caused by a huge amount of classes being loaded by reflection. Unfortunately, I can't find a way to see what classes are being loaded. Is there a way to extract that information from a heap dump?

Upvotes: 1

Views: 337

Answers (2)

Nik
Nik

Reputation: 201

You need Java Mission Control (jmc.exe) that comes with JDK to record the events on your application. Here is how you go: 1. Start jmc.exe from bin directory 2. Start recording. Select if you want whole or time limited recording. 3. Dump the recording. 4. Happy debugging.

Specifically, you can go to Memory tab -> Allocations -> Allocations by TLAB This gives the classes loaded and from where they are loaded.

Happy debugging.

Upvotes: 1

Jigar Joshi
Jigar Joshi

Reputation: 240946

You could pass

-verbose:class

to JVM to print what classes are being loaded

Upvotes: 2

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