java.lang.OutOfMemoryError: Java heap space

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java.lang.OutOfMemoryError: Java heap space
at java.lang.StringCoding$StringDecoder.decode(StringCoding.java:133)
at java.lang.StringCoding.decode(StringCoding.java:173)
at java.lang.StringCoding.decode(StringCoding.java:185)
at java.lang.String.(String.java:571)
at java.lang.String.(String.java:594)
at com.aqua.anttask.jsystem.JUnitTestRunner.run(JUnitTestRunner.java:484)
at com.aqua.anttask.jsystem.JSystemTask.executeInVM(JSystemTask.java:1384)
at com.aqua.anttask.jsystem.JSystemTask.execute(JSystemTask.java:953)
at com.aqua.anttask.jsystem.JSystemTask.executeOrQueue(JSystemTask.java:1798)
at com.aqua.anttask.jsystem.JSystemTask.execute(JSystemTask.java:895)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:357)
at org.apache.tools.ant.Target.performTasks(Target.java:385)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329)
at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)
at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:62)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)

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