jBPM KIE Server extension error in BRMS

Issue

• I get the following error on startup. I'm using BRMS so I wonder why it raises jBPM error.

2018-03-05 01:47:24,452 ERROR [org.kie.server.services.impl.KieServerImpl][ServerService Thread Pool -- 64] Error when initializing server extension of type jBPM KIE Server extension: java.lang.RuntimeException: Unable to create EntityManagerFactory due to [PersistenceUnit: org.jbpm.domain] Unable to build EntityManagerFactory
        at org.kie.server.services.jbpm.JbpmKieServerExtension.build(JbpmKieServerExtension.java:601)
        at org.kie.server.services.jbpm.JbpmKieServerExtension.init(JbpmKieServerExtension.java:163)
        at org.kie.server.services.impl.KieServerImpl.<init>(KieServerImpl.java:111)
        at org.kie.server.services.impl.KieServerImpl.<init>(KieServerImpl.java:90)
        at org.kie.server.services.impl.KieServerLocator.<clinit>(KieServerLocator.java:20)
        at org.kie.server.services.Bootstrap.contextInitialized(Bootstrap.java:49)
...
Caused by: javax.naming.NameNotFoundException: datasources/ExampleDS -- service jboss.naming.context.java.jboss.datasources.ExampleDS
        at org.jboss.as.naming.ServiceBasedNamingStore.lookup(ServiceBasedNamingStore.java:104)
        at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:197)
        at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:174)
        at org.jboss.as.naming.InitialContext$DefaultInitialContext.lookup(InitialContext.java:245)
        at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:174)
        at javax.naming.InitialContext.lookup(InitialContext.java:421)
        at javax.naming.InitialContext.lookup(InitialContext.java:421)
        at org.hibernate.service.jndi.internal.JndiServiceImpl.locate(JndiServiceImpl.java:65)
        ... 32 more