ClassCastException when adding JBoss LogManager to the boot classpath in EAP 6.1.0

Issue

• Users need to install a Java agent (e.g. Introscope or JMX agent) on my JBoss JVM. They followed the instructions in the solution that solves this (also addressed here), but when they upgrade to EAP 6.1.0, the workaround fails, and get this error:

09:28:18,984 ERROR [org.jboss.as.controller.management-operation] (ServerService Thread Pool -- 5) JBAS014612: Operation ("add") failed - address: ([
    ("subsystem" => "logging"),
    ("console-handler" => "CONSOLE")
]): java.lang.ClassCastException: org.jboss.logmanager.PropertyConfigurator cannot be cast to org.jboss.as.logging.logmanager.ConfigurationPersistence
        at org.jboss.as.logging.logmanager.ConfigurationPersistence.getOrCreateConfigurationPersistence(ConfigurationPersistence.java:93)
        at org.jboss.as.logging.logmanager.ConfigurationPersistence.getOrCreateConfigurationPersistence(ConfigurationPersistence.java:81)
        at org.jboss.as.logging.LoggingOperations$LoggingOperationStepHandler.execute(LoggingOperations.java:154)
        at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:440) [jboss-as-controller-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
        at org.jboss.as.controller.AbstractOperationContext.doCompleteStep(AbstractOperationContext.java:322) [jboss-as-controller-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
        at org.jboss.as.controller.AbstractOperationContext.completeStepInternal(AbstractOperationContext.java:229) [jboss-as-controller-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
        at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:224) [jboss-as-controller-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
        at org.jboss.as.controller.ParallelBootOperationStepHandler$ParallelBootTask.run(ParallelBootOperationStepHandler.java:334) [jboss-as-controller-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [classes.jar:1.6.0_45]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [classes.jar:1.6.0_45]
        at java.lang.Thread.run(Thread.java:680) [classes.jar:1.6.0_45]
        at org.jboss.threads.JBossThread.run(JBossThread.java:122) [jboss-threads-2.1.0.Final-redhat-1.jar:2.1.0.Final-redhat-1]

• ClassCastException when JBoss LogManager is initialized before the logging subsystem