Stunner - Change "Unable to parse xml" validation messages in Alerts panel

In process designer, all of the nodes below have similar warning Error messages in Alerts panel: "unable to parse xml : Exception class java.lang.IllegalArgumentException with specific messages:

• Two start nodes on canvas:
  • "A RuleFlowProcess cannot have more than one start node!"

• Error, Escalation and Compensation intermediate catching events without incoming sequence flows:
  • "Event node 'null' [1] has no incoming connection".
  • Furthermore, Error event cannot even cannot have incoming connection, so the message shouldn't be there at all.

• All Message events:
  • "No messages found"

• Both intermediate catching and throwing Link events:
  • "These nodes do not have a name"

• Intermediate throwing Escalation event:
  • "General escalation is not yet supported"

• End Escalation event:
  • "End events throwing an escalation must throw specific escalations (and not general ones)"

• Service task:
  • "Interface name is required attribute"

• Parallel, Exclusive and Inclusive gateways:
  • "Unknown gateway direction: Unspecified"

The messages mentioned above should be changed to a different format since the process can be parsed.

[Draft] Acceptance criteria

The messages mentioned above are changed to messages with format similar to:

• "Process 'PROCESS_NAME' [POJECT_NAME.PROCESS_NAME]: Node 'NODE_NAME' [NODE_NUMBER] Has no connection to the start node." or
  "[NODE] NODE_NAME has no outgoing connection.", etc..

"unable to parse xml" messages are shown only in case the process cannot be parsed.