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Editorial Team
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Asked: 2026-05-28T00:53:16+00:00

I want to see how much memory is allocated to my Java JVM on

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I want to see how much memory is allocated to my Java JVM on my Windows XP installation. I’m running an executable jar that has a main class that makes some JNI calls to a C library via a dll that is loaded using the System.loadLibrary(“SampleJni”). Some calls are working and some are not. Whenever there are more than one String parameters passed I get a system dump. If I just have one String, one int, two ints..etc, no crashes. The machine only has .99 GB of ram, so I’m thinking the JVM can’t allocate the need memory.

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1 Answer

  1. Editorial Team

    I’ve run JVMs (Java 6) on machines with less memory than that. IIRC the default for the JVM on windows was 64Mb, but that may have changed. Even if it did, it should be enough to start up. You’d also see OutOfMemoryErrors if this were the case rather than hard crashes.

    There are various methods in java.lang.Runtime that will let you inspect how much memory you have.

    The likely cause is the JNI interface. Its very easy to crash the JVM if the JNI code isn’t 100% correct.

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