[ https://issues.jboss.org/browse/WFLY-9516?page=com.atlassian.jira.plugin.... ] Scott Marlow edited comment on WFLY-9516 at 11/15/17 6:05 PM: -------------------------------------------------------------- {quote}Why does JPA sometimes start in INSTALL and sometimes start in POST_MODULE?{quote} Hibernate can only register its class file transformer during the POST_MODULE phase, so that Hibernate can rewrite entity classes. It is too late for Hibernate to register class file transformers during the INSTALL phase, as the application classes will have already been loaded during the INSTALL phase (I think by Weld). Applications that disable the persistence unit two phase start (via persistence unit hint "wildfly.jpa.twophasebootstrap=false"), will suffer from slower application performance as a result. If wildfly.jpa.twophasebootstrap=true, JPA phase 1 starts during POST_MODULE and JPA phase 2 starts during INSTALL. With wildfly.jpa.twophasebootstrap=false, single phase JPA bootstrap starts during INSTALL. was (Author: smarlow): {quote}Why does JPA sometimes start in INSTALL and sometimes start in POST_MODULE?{quote} Hibernate can only register its class file transformer during the POST_MODULE phase, so that Hibernate can rewrite entity classes. It is too late for Hibernate to register class file transformers during the INSTALL phase, as the application classes will have already been loaded during the INSTALL phase (I think by Weld). Applications that disable the persistence unit two phase start (via persistence unit hint "wildfly.jpa.twophasebootstrap=false"), will suffer from slower application performance as a result. -- This message was sent by Atlassian JIRA (v7.5.0#75005)