Exception in thread “main” java.lang.OutOfMemoryError: Java heap space

问题

I have written a code and I run it a lot but suddenly I got an OutOfMemoryError:

  Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
        at javax.media.j3d.BoundingBox.<init>(BoundingBox.java:86)
        at javax.media.j3d.NodeRetained.<init>(NodeRetained.java:198)
        at javax.media.j3d.LeafRetained.<init>(LeafRetained.java:40)
        at javax.media.j3d.LightRetained.<init>(LightRetained.java:44)
        at javax.media.j3d.DirectionalLightRetained.<init>(DirectionalLightRetained.java:50)
        at javax.media.j3d.DirectionalLight.createRetained(DirectionalLight.java:116)
        at javax.media.j3d.SceneGraphObject.<init>(SceneGraphObject.java:119)
        at javax.media.j3d.Node.<init>(Node.java:178)
        at javax.media.j3d.Leaf.<init>(Leaf.java:50)
        at javax.media.j3d.Light.<init>(Light.java:270)
        at javax.media.j3d.DirectionalLight.<init>(DirectionalLight.java:87)

回答1:

Well, it's fairly self-explanatory: you've run out of memory.

You may want to try starting it with more memory, using the -Xmx flag, e.g.

java -Xmx2048m [whatever you'd have written before]

This will use up to 2 gigs of memory.

See the non-standard options list for more details.

回答2:

You're out of memory. Try adding -Xmx256m to your java command line. The 256m is the amount of memory to give to the JVM (256 megabytes). It usually defaults to 64m.

回答3:

I don't know about javax.media.j3d, so I might be mistaken, but you usually want to investigate whether there is a memory leak. Well, as others note, if it was 64MB and you are doing something with 3d, maybe it's obviously too small...

But if I were you, I'll set up a profiler or visualvm, and let your application run for extended time (days, weeks...). Then look at the heap allocation history, and make sure it's not a memory leak.

If you use a profiler, like JProfiler or the one that comes with NetBeans IDE etc., you can see what object is being accumulating, and then track down what's going on.. Well, almost always something is incorrectly not removed from a collection...

回答4:

-Xmx1024m -XX:MaxPermSize=512m -Xms512m

Add this parameter as argument in your server params

回答5:

If you're recompiling a disassembled APK with APK tool:

Just Set Memory Allocation a little bigger

set switch -Xmx1024mto -Xmx2048m

java -Xmx2048m -jar signapk.jar -w testkey.x509.pem testkey.pk8 "%APKOUT%" "%SIGNED%"

you're good to go.. :)

来源：https://stackoverflow.com/questions/2381849/exception-in-thread-main-java-lang-outofmemoryerror-java-heap-space

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java

out-of-memory