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if deployment depends on org.apache.activemq.artemis module then there will be logged WARN:

12:32:17,101 WARN  [org.jboss.as.dependency.deprecated] (MSC service thread 1-8) WFLYSRV0221: Deployment "deployment.jmsServlet-1.0-SNAPSHOT.war" is using a deprecated module ("org.apache.activemq.artemis") which may be removed in future versions without notice.

it's harmless but there is no such warning on EAP 7.4 so customers might be suprised after migration to EAP 8.

For EAP 8.0.0.GA there is no workaround but once WFLY-18240 is backported into EAP 8.0.z it will be possible to depend on org.apache.activemq.artemis.client module to avoid this warning.