[jboss-jira] [JBoss JIRA] Created: (JGRP-1180) OutOfMemoryError

[Peter Kormos (JIRA)]

OutOfMemoryError
----------------

                 Key: JGRP-1180
                 URL: https://jira.jboss.org/jira/browse/JGRP-1180
             Project: JGroups
          Issue Type: Bug
    Affects Versions: 2.8
         Environment: 2.8.0.GA
            Reporter: Peter Kormos
            Assignee: Bela Ban


Hi Guys,

I wrote a simple program.

public testbed() throws Exception
  {
    JChannel channel = new JChannel();
    channel.connect("channelName");

    for (int i = 0; i < 100000000; i++)
    {
      Message msg = new Message(
          null,
          null,
          "Test");
      channel.send(msg);
      // Thread.sleep(10);

      if (i % 1000 == 0)
        System.out.print(".");
    }
}

When I run it with 

java -Xmx8m -XX:+HeapDumpOnOutOfMemoryError -cp .;jgroups-all.jar  testbed

not always, but quite often it dies with OutOfMemoryError

When I look at the heap dump with jhat, for "Instance Counts" it tells me 

22036 instances of class org.jgroups.Message 
22036 instances of class org.jgroups.protocols.pbcast.NakAckHeader 
22036 instances of class org.jgroups.util.Headers 
21316 instances of class org.jgroups.Event 
21314 instances of class org.jgroups.util.Queue$Element 
304 instances of class org.jgroups.util.UUID 

Why are there so many message objects stuck in memory?


java org.jgroups.Version prints

Version:      2.8.0.GA
CVS:          $Id: Version.java,v 1.81 2009/12/01 10:31:13 belaban Exp $

I'm using Windows Xp with 1.6 JDK

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