I have two ear files, a simple server and a simple client. The client ear depends on the server ear. The Client ear sends a Http request to the server in its Postconstruct. If both ear files have been deployed and you restart Wildfly it will fail with:
2019-05-01 11:18:25,168 ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) WFLYCTL0348: Timeout after [300] seconds waiting for service container stability. Operation will roll back. Step that first updated the service container was 'add' at address '[
("core-service" => "management"),
("management-interface" => "http-interface")
]'
This error does not occur on Wildfly 10 but does on 11 and 16. I have not tested the 12 through 15. I have included a Gradle project with the 2 ear files.