When setting PersistSlots to On, EAP node can not rejoin mod_cluster due to java.lang.IllegalArgumentException -------------------------------------------------------------------------------------------------------------- Key: MODCLUSTER-636 URL: https://issues.jboss.org/browse/MODCLUSTER-636 Project: mod_cluster Issue Type: Bug Components: Native (httpd modules) Affects Versions: 1.3.5.Final Environment: JBCS httpd 2.4.23 SP2 mod_cluster: 1.3.5 EAP: 7.0.8 Reporter: Alex Cai Assignee: Jean-Frederic Clere Customer set 'PersistSlots On' and sometimes the jboss eap node could not rejoing into mod_cluster due to java.lang.IllegalArgumentException When they got this exception, they have to delete every cache files then restart httpd and jboss for join correctly. Customer tried the below actions: 1) apache stop -> delet manager.* files in the mod_cluster directory -> apache start - this action could cause http 503 error or 2) pre-backup the all files(normal files before issue) in the mod_cluster directory. when the issue occure, apache stop -> restore manager.* files from backuped files -> apache start - no http 503 error Please see the case for more details: https://access.redhat.com/support/cases/01986243