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Editorial Team
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Asked: 2026-05-12T05:52:54+00:00

My Java application runs another Java application, by running the process java -jar j.jar.

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My Java application runs another Java application, by running the process “java -jar j.jar”. J.jar is known to use a LOT of memory depending on the dataset it is given, and often gets an OutOfMemoryError heap. So I want to use -Xmx on it, so that I can allocate as much memory as possible (or close to). I was thinking of getting the total memory on the system, then specifying 80-90% of that in -Xmx.

Is there any solution to my problem? And, how does my solution sound?

Edit: I cant reduce the memory consumption as the memory being used is by Java’s built-in pack200 compression, which I am using to pack some JAR files.

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  1. Editorial Team

    Depending on your OS, this might work for getting the free and available memory size:

    java.lang.management.OperatingSystemMXBean mxbean = java.lang.management.ManagementFactory.getOperatingSystemMXBean();
com.sun.management.OperatingSystemMXBean sunmxbean = (com.sun.management.OperatingSystemMXBean) mxbean;
long freeMemory = sunmxbean.getFreePhysicalMemorySize();
long availableMemory = sunmxbean.getTotalPhysicalMemorySize();

    From there, you can figure out 80-90% and launch your jar with the max memory size you want.

    I don’t know that this works with all OS’s (i.e. Windows), but it worked when I tested it with both OSX and Linux.

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