2 Replies Latest reply on Apr 18, 2003 4:22 AM by hris

    java.lang.OutOfMemoryError with CMR Collection

    afsilva
    afsilva Apr 16, 2003 3:06 PM

      Hi,

      I'm getting OutOfMemoryError with such simple code below. The collection returned by the CMR field 'pjs' has around 30000 elements. After getting the Pj object, I don't alter nor delete it. I've tried to breake the code in separete transactions, but in JBoss 3.0.6 I can't use a CMR Collection started in one trancation in a different one. If I increase the heap size of the JVM, solves the problem, but I think this is not a real solution.

      Enterprise enterprise = eh.findByPrimaryKey(new BigDecimal(idEnterprise));
      for (Iterator i = enterprise.getPjs().iterator(); i.hasNext();) {
      Pj pj = (Pj)i.next();
      // ... Inspect data, doesn't alter or delete
      }


      I'm using JBoss 3.0.6, jdk 1.4.0 and Oracle 8i, all under windows 2000.


      Please, is that some configuration option I'm forgetting to set, someone has already had this problem?

      Thanks,

      Andre

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        • 1. Re: java.lang.OutOfMemoryError with CMR Collection
          hris
          hris Apr 18, 2003 2:22 AM (in response to afsilva)

          What are your JVM memory settings?

          in the JBOSS_HOME/bin/run.bat, try to set the java settings to:

          %JAVA% %JAVA_OPTS% -Xms256m -Xmx256m -classpath "%JBOSS_CLASSPATH%" org.jboss.Main %ARGS%

          As a rule of thumb, you can set the -Xms and -Xmx to 1/2 the available (physical) memory on your server. The default java settings are definitely not enough to run large apps. Plus, what's the point in gearing a sexy multi-Giga RAM server if you run java on 128MB?

          Hope this helps

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          • 2. Re: java.lang.OutOfMemoryError with CMR Collection
            hris
            hris Apr 18, 2003 4:22 AM (in response to afsilva)

            Looks like my last post doesn't show (???)
            Let's try again:

            set JVM memory settings in this file:

            JBOSS_HOME/bin/run.bat

            %JAVA% %JAVA_OPTS% -Xms128m -Xmx128m -classpath "%JBOSS_CLASSPATH%" org.jboss.Main %ARGS%

            128m = 128MB allocated to this java virtual machine.
            128MB is not enough for large or mem-hungry apps. should be at least 256MB or approx 1/2 the physical memory available on the machine.

            Laurent

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