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  1. ,
    via oracle.com by Unknown author

    An easy way to solve OutOfMemoryError in java is to increase the maximum heap size by using JVM options -Xmx512M, this will immediately solve your OutOfMemoryError.

  2. ,
    via Stack Overflow by Eugene Yokota

    In Eclipse : go to Run --> Run Configurations --> then select the project under maven build --> then select the tab "JRE" --> then enter -Xmx1024m.

    This should increase the memory heap for all the builds/projects. The above memory size is 1 GB.

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java.lang.OutOfMemoryError: Java heap space	at java.util.Arrays.copyOf(Arrays.java:2219)	at java.util.ArrayList.toArray(ArrayList.java:329)	at java.util.ArrayList.addAll(ArrayList.java:530)	at Test.permute(Test.java:45)	at Test.permute(Test.java:41)	at Test.permute(Test.java:41)	at Test.permute(Test.java:41)	at Test.main(Test.java:18)