Out of specification: Singleton EJB is allowed to implement SessionBean interface. ---------------------------------------------------------------------------------- Key: WFLY-12265 URL: https://issues.jboss.org/browse/WFLY-12265 Project: WildFly Issue Type: Bug Components: EJB Affects Versions: 16.0.0.Final, 17.0.0.Final Reporter: Cheng Fang Assignee: Tomas Hofman Priority: Major Fix For: 18.0.0.Beta1 Attachments: SingletonBean.java Singleton EJB is allowed to implement SessionBean interface and the EJB 3.2 spec says in section 4.9.2 Session Bean Class: "The class may implement, directly or indirectly, the javax.ejb.SessionBean interface. Except for singleton session beans." EAP should throw an exception or log a warning that it is not valid by the spec.