A stateless EJB is deployed within an application (let's call it app A), server logs are as follows:

java:global/app/core-ejb/UserServiceBean!mypackage.UserService
java:app/core-ejb/UserServiceBean!mypackage.UserService
java:module/UserServiceBean!mypackage.UserService
java:jboss/exported/app/core-ejb/UserServiceBean!mypackage.UserService
ejb:app/core-ejb/UserServiceBean!mypackage.UserService
java:global/app/core-ejb/UserServiceBean
java:app/core-ejb/UserServiceBean
java:module/UserServiceBean

This bean is tried to be looked up from a different application (let's call it app B) deployed on the same server.

It is looked up using the ejb namespace: ejb:app/core-ejb/UserServiceBean!mypackage.UserService

This JNDI url is correct but we got this error:  javax.ejb.NoSuchEJBException: EJBCLIENT000079: Unable to discover destination for request for EJB StatelessEJBLocator for \"app/core-ejb/UserServiceBean\", view is interface mypackage.UserService, affinity is None.

To be mentioned that the client code is called within a @PostConstruct method of a Singleton, Startup EJB in app B.

App B is started after app A (app A is declared as deployment dependency of app B in jboss-all.xml).

JNDI look up works well with java:global namespace, but ejb namespace was also expected to work in this case.