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Editorial Team
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Asked: 2026-05-13T08:57:46+00:00

When trying to build Apache FOP by ant on the command line, it complains:

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When trying to build Apache FOP by ant on the command line, it complains:

[javac] The system is out of resources.
[javac] Consult the following stack trace for details.
[javac]     ...
[javac]     at com.sun.tools.javac.main.Main.compile(Main.java:353)

I don’t understand. I have enough RAM, how can the system run out of resources?

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1 Answer

  1. Editorial Team

    You need to give more memory to your JVM. e.g. the below allocates 512Mb to the JVM.

    javac -Xmx512m ...

    The Java virtual machine runs with a fixed maximum memory size. For memory-intensive operations you need to increase this appropriately. -Xmx specifies the maximum amount of memory the JVM will take. -Xms specifies the amount of memory the JVM allocates on start-up.

    There’s a nice summary of options here.

    Note: Given the above occurs via Ant, you may need to increase the memory available to Ant (e.g. set ANT_OPTS=-Xms256M -Xmx512M), and/or the memory available to your javac process if that’s being forked as a separate executable.

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