Cannot launch composed tasks

[aruiz14]

Description:

Trying to launch a very simple composed task definition results in the following error:

Failed to resolve MavenResource: org.springframework.cloud:spring-cloud-dataflow-composed-task-runner:jar:@dataflow.version@. Configured remote repository: : [springRepo]

Release versions:
I think that only the latest 2.9.5 version is affected, while 2.9.4 works well.

Steps to reproduce:

1. Start from a fresh installation.
2. Add applications
   2.1 "Stream application starters for RabbitMQ/Maven"
   2.2 "Task application starters for Maven"
3. Create a dummy composed task, with definition: 1: timestamp && 2:timestamp
4. Go to the new task and try to launch it

Screenshots:

Additional context:
From what I could observe, I think it's a problem with a variable interpolation affecting the spring.cloud.dataflow.task.composedtaskrunner.uri property in the spring-cloud-dataflow-server-core module. Probably missing from this PR ( #5014 ). I downloaded and extracted the .jar file for this version and I could check how spring-cloud-dataflow-server-core/src/main/resources/META-INF/dataflow-server-defaults.yml still contained @dataflow.version@:

META-INF/dataflow-server-defaults.yml
110:          uri: "maven://org.springframework.cloud:spring-cloud-dataflow-composed-task-runner:@dataflow.version@"

[onobc]

@aruiz14 thank you for the report and digging into the cause. We will get this addresses ASAP. In the meantime...

Workaround

Specify the property manually such as:

spring.cloud.dataflow.task.composedtaskrunner.uri=maven://org.springframework.cloud:spring-cloud-dataflow-composed-task-runner:2.9.5

OR as env var:

SPRING_CLOUD_DATAFLOW_TASK_COMPOSEDTASKRUNNER_URI=maven://org.springframework.cloud:spring-cloud-dataflow-composed-task-runner:2.9.5

ℹ️ NOTE This property is required at SCDF server start time (app content refresh) and therefore must be specified when launching the server. Unfortunately setting it as an app or deployment property at task launch time will have no effect.

[markpollack]

Will make a 2.9.6 release to address this.