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

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

January 15, 2007 Java 6 Comments

You receive this message when compiling a code in Java:

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

When this exception occurs, it means that Java has run out of memory. If this code is still under development process, you should investigate for any memory leak issue. Or you could let Java to use more memory.

You can increase memory(heap size) by run java including these parameters:

-Xms[initial heap size] -Xmx[maximum heap size]

For example, set initial heap size to 128m and maximum to 256m.

java -Xms128m -Xmx256m

In NetBeans, simply goes to Project Properties –> Run.
Then you can add these parameters in VM Options.

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6 Comments

  1. sagi March 13, 2008

    do you know how do i set initial heap size to 128m in Jcreator?

  2. linglom March 13, 2008

    I’m not sure on JCreator but there must be a setting similar to NetBeans that let you add argument when execute java.exe commmand.

  3. Wudhichart January 7, 2009

    Thx.

  4. hanman July 18, 2010

    thanks, its very useful….

  5. icha January 5, 2012

    hiii.. i faced the same problem “Exception in thread “main” java.lang.OutOfMemoryError: Java heap space”
    i’hv increase the heap from 32m until 1024m, but it did not work. 🙁

  6. Olubori September 22, 2012

    “Exception in thread “main” java.lang.OutOfMemoryError: Java heap space”. this is a problem i’ve been for two days now, how can i solve it in netbeans.

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