Tomcat does not register MBeans for XADataSource

Issue

• We've configured a datasource of type javax.sql.XADataSource in Tomcat, but there are no "tomcat.jdbc" MBeans registered for it. The mbeans appear when switching it to a javax.sql.DataSource:

  <Resource name="jdbc/TestDB" type="javax.sql.XADataSource"
            factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
            auth="Container" 
            username="postgres"
            password="postgres"
            maxActive="100"
            minIdle="10"
            jmxEnabled="true"
            driverClassName="org.postgresql.Driver"
            url="jdbc:postgresql://localhost:5432/test" />