mail subsystem cannot be created from scratch with the CLI

using standard "standalone.xml" /subsystem=mail:remove => success /subsystem=mail:add => JBAS014677: Failed to persist configuration change: JBAS014675: Failed to marshal configuration The reason: mail/src/main/java/org/jboss/as/mail/extension/MailSubsystemParser.java public void writeContent(XMLExtendedStreamWriter writer, SubsystemMarshallingContext context) throws XMLStreamException { context.startSubsystemElement(Namespace.CURRENT.getUriString(), false); ModelNode model = context.getModelNode(); List<Property> sessions = model.get(MAIL_SESSION).asPropertyList(); => the code assumes there will always be (at least) one mail session. Correct code should test with: model.hasDefined(MAIL_SESSION)