JBoss hits IllegalStateException upon reload after adding modcluster subsystem

Solution Verified - Updated

Environment

  • JBoss Enterprise Application Platform (EAP) 6.4.4 and earlier

Issue

  • We add the modcluster subsystem then reload through a sequence of CLI commands like the following:
[standalone@localhost:9999 /] /extension=org.jboss.as.modcluster:add
[standalone@localhost:9999 /] batch
[standalone@localhost:9999 / #] /subsystem=modcluster:add()
[standalone@localhost:9999 / #] /subsystem=modcluster/mod-cluster-config=configuration:add(connector=http,advertise="false",proxy-list="127.0.0.1:6666")
[standalone@localhost:9999 / #] run-batch
[standalone@localhost:9999 /] :reload
  • This hits an exception upon reload:
java.lang.IllegalStateException: JBAS018786: Multiple Deployment Unit registered processors with priority class 7170 and class org.jboss.as.modcluster.ModClusterServiceWebDependencyProcessor
at org.jboss.as.server.DeployerChainAddHandler.addDeploymentProcessor(DeployerChainAddHandler.java:63)
	at org.jboss.as.server.AbstractDeploymentChainStep$1.addDeploymentProcessor(AbstractDeploymentChainStep.java:40)
	at org.jboss.as.modcluster.ModClusterSubsystemAdd$1.execute(ModClusterSubsystemAdd.java:96)
	at org.jboss.as.server.AbstractDeploymentChainStep.execute(AbstractDeploymentChainStep.java:50)
	at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:702) [jboss-as-controller-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
	at org.jboss.as.controller.AbstractOperationContext.doCompleteStep(AbstractOperationContext.java:537) [jboss-as-controller-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
	at org.jboss.as.controller.AbstractOperationContext.completeStepInternal(AbstractOperationContext.java:338)
  • Deployment fails unpredictable with mod cluster active.

Resolution

  • Apply JBoss EAP 6.4 Cumulative Patch (CP) 6 or later
  • As a workaround, do a full shutdown and restart after adding the modcluster subsystem

Root Cause

SBR
Product(s)
Components
Category
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