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Editorial Team
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Asked: 2026-05-28T07:45:05+00:00

We have recently started to see this exception while running the play framework in

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We have recently started to see this exception while running the play framework in auto test mode:

~ testcode...                                                                              Exception in thread "JS executor for com.gargoylesoftware.htmlunit.WebClient@3ac58af4" java.lang.OutOfMemoryError: Java heap space
    at net.sourceforge.htmlunit.corejs.javascript.Parser.propertyAccess(Parser.java:2656)
    at net.sourceforge.htmlunit.corejs.javascript.Parser.memberExprTail(Parser.java:2527)
    at net.sourceforge.htmlunit.corejs.javascript.Parser.memberExpr(Parser.java:2502)
    at net.sourceforge.htmlunit.corejs.javascript.Parser.unaryExpr(Parser.java:2376)
    at net.sourceforge.htmlunit.corejs.javascript.Parser.mulExpr(Parser.java:2299)

My searches on Google seem to indicate that this may be due to having pages that are a bit big. I’ve monitored the FirePhoque process and it seems to be limited to a 128M heap size or so.

Is there an official way to increase that heap size?

Note that increasing the heap size of the play runtime does not help.

Thanks.

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1 Answer

  1. Editorial Team

    You can edit the python script that controls this. The reason increasing Play’s heap size is because Firephoque runs in a different VM (if I’m reading the code correctly!)

    Open ${PLAY_HOME}/framework/pym/play/commands/base.py and find the autotest() method. In there, about half-way down, is the comment # Run FirePhoque. Under here is the command builder for running Firephoque – you can increase the heap size here by changing

    java_cmd = [app.java_path(), '-classpath', cp_args, '-Dapplication.url=%s://localhost:%s' % (protocol, http_port), '-DheadlessBrowser=%s' % (headless_browser), 'play.modules.testrunner.FirePhoque']

    to

    java_cmd = [app.java_path(), '-Xmx512M -classpath', cp_args, '-Dapplication.url=%s://localhost:%s' % (protocol, http_port), '-DheadlessBrowser=%s' % (headless_browser), 'play.modules.testrunner.FirePhoque']
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