Decreasing max-threads on a unbounded queuesless executor generates IllegalArgumentException -------------------------------------------------------------------------------------------- Key: WFLY-2336 URL: https://issues.jboss.org/browse/WFLY-2336 Project: WildFly Issue Type: Bug Affects Versions: 8.0.0.Beta1 Reporter: Aaron Ogburn Priority: Minor Create an unbounded queueless executor <unbounded-queue-thread-pool name="uq-thread-pool"> <max-threads count="350"/> <keepalive-time time="5" unit="minutes"/> </unbounded-queue-thread-pool> Modifying max-threads fails: /subsystem=threads/unbounded-queue-thread-pool=uq-thread-pool:write-attribute(name=max-threads,value=300) { "outcome" => "failed", "failure-description" => "JBAS014749: Operation handler failed: null", "rolled-back" => true } ler-8.0.0.Beta2-SNAPSHOT.jar:8.0.0.Beta2-SNAPSHOT] at org.jboss.as.protocol.mgmt.AbstractMessageHandler$2$1.doExecute(AbstractMessageHandler.java:296) [wildfly-protocol-8.0.0.Beta2-SNAPSHOT.jar:8.0.0.Beta2-SNAPSHOT] at org.jboss.as.protocol.mgmt.AbstractMessageHandler$AsyncTaskRunner.run(AbstractMessageHandler.java:518) [wildfly-protocol-8.0.0.Beta2-SNAPSHOT.jar:8.0.0.Beta2-SNAPSHOT] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) [rt.jar:1.7.0] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) [rt.jar:1.7.0] at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0] at org.jboss.threads.JBossThread.run(JBossThread.java:122) [jboss-threads-2.1.1.Final.jar:2.1.1.Final] The core pool size needs to be adjusted in line with the max pool size to avoid that.