IllegalArgumentException when updating max-threads

Issue

• While updating max-threads in unbounded-queue-thread-pool getting IllegalArgumentException

ERROR [org.jboss.as.controller.management-operation] (management-handler-thread - 2) JBAS014612: Operation ("write-attribute") failed - address: ([
    ("subsystem" => "threads"),
    ("unbounded-queue-thread-pool" => "uq-thread-pool")
]): java.lang.IllegalArgumentException
    at java.util.concurrent.ThreadPoolExecutor.setMaximumPoolSize(ThreadPoolExecutor.java:1667) [rt.jar:1.7.0_21]
    at org.jboss.threads.JBossThreadPoolExecutor.setMaxThreads(JBossThreadPoolExecutor.java:95) [jboss-threads-2.1.1.Final.jar:2.1.1.Final]
    at org.jboss.as.threads.ManagedJBossThreadPoolExecutorService.setMaxThreads(ManagedJBossThreadPoolExecutorService.java:86)
    at org.jboss.as.threads.UnboundedQueueThreadPoolService.setMaxThreads(UnboundedQueueThreadPoolService.java:91)
    at org.jboss.as.threads.UnboundedQueueThreadPoolWriteAttributeHandler.applyOperation(UnboundedQueueThreadPoolWriteAttributeHandler.java:62)
    at org.jboss.as.threads.ThreadsWriteAttributeOperationHandler.applyUpdateToRuntime(ThreadsWriteAttributeOperationHandler.java:90)