Java memory leak running jni through swig

[Nathan Salwen]

I installed swig2.0 and swig2.0-examples and then modified the examples in 2 ways. First I unzipped swig2.0-examples/Makefile.gz and edited the JAVA_INCLUDE line to be

JAVA_INCLUDE= -I"/usr/lib/jvm/java-7-openjdk-amd64/include" -I"/usr/lib/jvm/java-7-openjdk-amd64/include/linux"

Then I edited the file swig2.0-examples/java/class/runme.java to add the following to the main() procedure.

  public static void main(String argv[])
  {
    // ----- Object creation -----

      for (int i = 0; i < 10000; i++)
          {

              for (int j = 0; j < 10000; j++)
                  {
                      System.out.println( " Loop number " + i + ","+j );
                      for (int k = 0; k < 10000; k++)
                          {
                              Circle c = new Circle(10);
                              c.delete();
                          }
                  }
          }

When I run I see the memory usage for the process increase until it hits around 25% of total memory. Then the process starts running very slowly (I think it is trying to find free memory). Finally it crashes with the error:

Exception in thread "main" java.lang.OutOfMemoryError: GC overhead limit exceeded
        at runme.main(runme.java:26)

Interestingly, this error does not occur on a different system which also has Ubuntu 12.04 and openjdk-7-jre but which is a 32-bit i386 architecture.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: openjdk-7-jre-headless 7~u3-2.1.1~pre1-1ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu12
Architecture: amd64
Date: Thu Aug 9 11:17:30 2012
ExecutablePath: /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
LocalLibraries: /home/nks/swig2.0-examples/java/class/libexample.so
ProcEnviron:
 SHELL=/bin/bash
 TERM=dumb
 PATH=(custom, user)
 LANG=en_US.UTF-8
SourcePackage: openjdk-7
UpgradeStatus: No upgrade log present (probably fresh install)