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    A workaround in optaplanner 6.0.1 is probably to enforce RETE_OO<br>
    (unfortunately ScoreDirectorFactoryConfig#buildKieBase hard codes
    that, so that's a PITA).<br>
    <br>
    It's fixed in BRMS 6.0.0.GA and optaplanner 6.1.0.Beta1.<br>
    optaplanner 6.1.0.Beta1 might be released later this month.<br>
    <br>
    <div class="moz-cite-prefix">On 19-02-14 13:11, Matteo Mortari
      wrote:<br>
    </div>
    <blockquote
cite="mid:CAHOoiEpKMoB8qQqYsaTV7Lsc1c9tM8qiB9=YTA8j0LOL1hsjeA@mail.gmail.com"
      type="cite">
      <div dir="ltr">Ciao, I'm another Drools user also encountering
        similar OutOfMemory errors with v6.0.1; I'm not 100% sure what
        is your issue specific to, but this may be related / of interest
        to your case:&nbsp;<a moz-do-not-send="true"
          href="https://issues.jboss.org/browse/DROOLS-411">https://issues.jboss.org/browse/DROOLS-411</a>
        <div>
          <br>
        </div>
        <div>Hope this helps;</div>
        <div>Ciao</div>
        <div>MM</div>
      </div>
      <div class="gmail_extra"><br>
        <br>
        <div class="gmail_quote">On Wed, Feb 19, 2014 at 8:20 AM, john
          poole <span dir="ltr">&lt;<a moz-do-not-send="true"
              href="mailto:jdpoole@gmail.com" target="_blank">jdpoole@gmail.com</a>&gt;</span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">I've
            converted some NurseRostering rules, which worked in Drools
            5.50, to<br>
            OptaPlanner 6.0.1. While it works far better for the time it
            runs, it uses<br>
            up whatever memory I can give it (9GB) and then eventually
            crashes the GUI.<br>
            <br>
            with:<br>
            Exception in thread "AWT-EventQueue-0"
            java.lang.OutOfMemoryError: GC<br>
            overhead limit exceeded<br>
            <br>
            Is there a way to limit how much memory OptaPlanner uses? Or
            is it likely<br>
            that I'm just adding fact to the WorkingMemory in a way that
            wasn't a<br>
            problem in 5.5 but is a problem in 6.0?<br>
            <br>
            <br>
            <br>
            <br>
            <br>
            --<br>
            View this message in context: <a moz-do-not-send="true"
href="http://drools.46999.n3.nabble.com/OutOfMemoryError-using-6-0-1-tp4028183.html"
              target="_blank">http://drools.46999.n3.nabble.com/OutOfMemoryError-using-6-0-1-tp4028183.html</a><br>
            Sent from the Drools: User forum mailing list archive at
            Nabble.com.<br>
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          </blockquote>
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