Unclear error message when creating multiple thread pools of the same type for a workmanager -------------------------------------------------------------------------------------------- Key: WFLY-6776 URL: https://issues.jboss.org/browse/WFLY-6776 Project: WildFly Issue Type: Bug Components: JCA Affects Versions: 10.0.0.Final Reporter: Lin Gao Assignee: Lin Gao When there is already a long-running thread pool for a work manager and you try to create another one: {{/subsystem=jca/workmanager=default/long-running-threads=custom:add(max-threads=30, queue-length=30)}} you only get an opaque error message: {{"failure-description" => "WFLYCTL0086: Failed to persist configuration change: WFLYCTL0084: Failed to marshal configuration",}} with a, also useless, {{java.lang.IllegalArgumentException}} in the server log. It should be more obvious that the error is that you cannot create two long-running thread pools