OOM encountered with tomcat-sso-tests with 64 bit JVM

deploy, url=file:/mnt/hudson_workspace/workspace/JBoss-AS-5.x-testSuite-sun16/JBossAS_5_x/testsuite/output/lib/programmaticweblogin.ear
05:03:59,926 WARN [BasicMBeanRegistry] preRegister() failed for jboss.deployment:id="jboss.jacc:id="vfszip:/mnt/hudson_workspace/workspace/JBoss-AS-5.x-testSuite-sun16/JBossAS_5_x/testsuite/output/lib/web-sso.ear/jbosstest-web-ejbs.jar/",parent="web-sso.ear",service=jacc",type=Component:
05:04:20,304 ERROR [STDERR] Exception in thread "AOPListner"
05:17:09,347 ERROR [STDERR] java.lang.OutOfMemoryError: Java heap space
05:13:43,064 ERROR [BasicMBeanRegistry] Cannot register MBean
java.lang.OutOfMemoryError: Java heap space
05:13:40,032 WARN [MainDeployer] Failed to deploy: file:/mnt/hudson_workspace/workspace/JBoss-AS-5.x-testSuite-sun16/JBossAS_5_x/testsuite/output/lib/programmaticweblogin.ear
org.jboss.deployers.spi.DeploymentException: Exception determining structure: AbstractVFSDeployment(programmaticweblogin.ear)
at org.jboss.deployers.spi.DeploymentException.rethrowAsDeploymentException(DeploymentException.java:49)
at org.jboss.deployers.structure.spi.helpers.AbstractStructuralDeployers.determineStructure(AbstractStructuralDeployers.java:85)
at org.jboss.deployers.plugins.main.MainDeployerImpl.determineStructure(MainDeployerImpl.java:1004)
at org.jboss.deployers.plugins.main.MainDeployerImpl.determineDeploymentContext(MainDeployerImpl.java:440)
at org.jboss.deployers.plugins.main.MainDeployerImpl.addDeployment(MainDeployerImpl.java:390)
at org.jboss.deployers.plugins.main.MainDeployerImpl.addDeployment(MainDeployerImpl.java:300)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:829)
at org.jboss.deployment.MainDeployer.redeploy(MainDeployer.java:605)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)