To migration guide for EAP 7.0 -> EAP 7.1 we need to document how to migrate Artemis journal directory (messaging data) from EAP 7.0 -> EAP 7.1.

This should look the same as in [1] however the part how journal is exported in EAP 7.0 differs from how it's exported from EAP 6.4. Thus this part should be changed.

Start the server in admin only mode and connect to CLI. For exporting Artemis journal from EAP 7.0.z use CLI command:

[standalone@localhost:9990 /] /subsystem=messaging-activemq/server=default:export-journal()
{
    "outcome" => "success",
    "result" => "/home/mnovak/hornetq_eap6_dev/internal/eap-tests-hornetq/scripts/server1/jboss-eap/standalone/data/activemq/journal-20170428-131854564+0200-dump.xml"
}

Next part is the same. Importing journal to EAP 7.1 is the same as for EAP 7.0.

[1] https://doc-stage.usersys.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.1.alpha/html-single/migration_guide/#migrate_messaging_data