ERROR An embedded messaging broker is added by default , to disable configuring an embedded messaging broker set the DISABLE_EMBEDDED_JMS_BROKER environment variable to true

Issue

• If the default server configured in messaging-activemq subsystem, the EAP 7.3 container fails to start with the following console log:

WARN Configuration of an embedded messaging broker within the appserver is enabled but is not recommended. Support for such a configuration will be removed in a future release.
WARN If you are not configuring messaging destinations, to disable configuring an embedded messaging broker set the DISABLE_EMBEDDED_JMS_BROKER environment variable to true.
INFO Configuring the server using embedded server
Error applying /tmp/cli-configuration-script-1585617434.cli CLI script. Embedded server started successfully. The Operations were executed but there were unexpected values. See list of errors in /tmp/cli-script-error-1585617434.cli
INFO Duration: 5604 milliseconds
ERROR An embedded messaging broker is added by default, to disable configuring an embedded messaging broker set the DISABLE_EMBEDDED_JMS_BROKER environment variable to true. Fix your configuration to not contain a default server configured on messaging-activemq subsystem for this to happen.

• If the below customized standalone-openshift.xml that started properly in EAP 7.2 is brought to EAP 7.3, the EAP 7.3 container fails to start.

<subsystem xmlns="urn:jboss:domain:messaging-activemq:4.0">
    <server name="default">
     ...
    </server>
</subsystem>