WorkflowStub.cancel throws wrong exception

[enlait]

Expected Behavior

WorkflowStub.cancel methods are documented to throw a WorkflowNotFoundException if a workflow does not exist or is already completed

Actual Behavior

A different exception is thrown in explicit internal check and propagated up:

java.lang.IllegalStateException: Null workflowId. Was workflow started?
  at io.temporal.client.WorkflowStubImpl.checkStarted(WorkflowStubImpl.java:500)
  at io.temporal.client.WorkflowStubImpl.cancel(WorkflowStubImpl.java:446

Steps to Reproduce the Problem

1. try to cancel workflow with non-existent id

Specifications

• Version: Temporal Java SDK 1.32.0
• Platform:

[tconley1428]

The resolution here is likely to be documenting the exception rather than changing it. Changing it would potentially be a breaking change if someone was already using it for exception control flow. Thanks for the notice.