Dataflow-server: Ending a task flow on a certain condition results in an error on task creation

[yoep]

Description:
We're trying to create a task flow which should end when a task application ends on exit status X.
When adding a condition on the flow to the end, the following gets added to the task definition 'X'->$END.
When trying to create this flow, the task definition gets rejected.

The error message which is shown:
The 'task:$END' application could not be found.

Release versions:
2.7.0

Custom apps:
We use custom apps, but they're not directly related to this issue.

Steps to reproduce:

• Create a multi task application flow in the Dataflow Server UI
• Let one of the task application flow go to the "end" with a condition
• Try to create the task
• The following message is shown: The 'task:$END' application could not be found.

Screenshots:

Additional context:
Task definition:

ftp-download: diverse-ftp-scheduler 'NO_FILES_FOUND'->$END && messages-messages-bulk && ftp-upload: diverse-ftp-scheduler

API response:

{
  "_embedded": {
    "errors": [
      {
        "message": "The 'task:$END' application could not be found.",
        "logref": "NoSuchAppRegistrationException",
        "_links": {
          "self": {
            "href": "/"
          }
        }
      }
    ]
  }
}

[sabbyanandan]

Hi, @yoep. Thanks for the details. We will have a look.

[cppwfs]

I was able to reproduce this problem. I've opened up the following issues to resolve this problem.
spring-cloud/spring-cloud-dataflow-ui#1653
spring-cloud/spring-cloud-dataflow-ui#1654
#4387

Thank you for reporting.