core-threads of ManagedScheduledExecutorService limits number of maximal threads -------------------------------------------------------------------------------- Key: WFLY-10731 URL: https://issues.jboss.org/browse/WFLY-10731 Project: WildFly Issue Type: Bug Components: EE Affects Versions: 12.0.0.Final Reporter: gunter zeilinger Assignee: Jiri Ondrusek Priority: Major After changing the default configuration: {noformat} <managed-scheduled-executor-services> - <managed-scheduled-executor-service name="default" jndi-name="java:jboss/ee/concurrency/scheduler/default" context-service="default" hung-task-threshold="60000" keepalive-time="3000"/> + <managed-scheduled-executor-service name="default" jndi-name="java:jboss/ee/concurrency/scheduler/default" context-service="default" long-running-tasks="true" core-threads="2" keepalive-time="3000"/> </managed-scheduled-executor-services> {noformat} only 2 (= value of core-threads) threads are used by the Scheduled Executer Service: {code:bash} $ grep ManagedScheduledExecutorService $WILDFLY/standalone/log/server.log | tail 2018-07-24 12:03:22,901 INFO [org.dcm4che3.net.Association] (EE-ManagedScheduledExecutorService-default-Thread-2) .. 2018-07-24 12:03:22,911 INFO [org.dcm4che3.net.Association] (EE-ManagedScheduledExecutorService-default-Thread-1) .. 2018-07-24 12:03:22,923 INFO [org.dcm4che3.net.Association] (EE-ManagedScheduledExecutorService-default-Thread-2) .. 2018-07-24 12:03:22,963 INFO [org.dcm4che3.net.Association] (EE-ManagedScheduledExecutorService-default-Thread-1) .. 2018-07-24 12:03:22,967 INFO [org.dcm4che3.net.Association] (EE-ManagedScheduledExecutorService-default-Thread-2) .. 2018-07-24 12:03:22,981 INFO [org.dcm4che3.net.Association] (EE-ManagedScheduledExecutorService-default-Thread-1) .. 2018-07-24 12:03:22,996 INFO [org.dcm4che3.net.Association] (EE-ManagedScheduledExecutorService-default-Thread-2) .. 2018-07-24 12:03:23,016 INFO [org.dcm4che3.net.Association] (EE-ManagedScheduledExecutorService-default-Thread-1) .. 2018-07-24 12:03:23,035 INFO [org.dcm4che3.net.Association] (EE-ManagedScheduledExecutorService-default-Thread-2) .. 2018-07-24 12:03:23,039 INFO [org.dcm4che3.net.Association] (EE-ManagedScheduledExecutorService-default-Thread-1) .. {code} I have not yet tested if the issue also effects Wildfly 13.0.0.Final ( cannot use Wildfly 13.0.0.Final because of WFLY-10531 )