[jira] [Created] (FELIX-5786) DS does not propagate activation exceptions from ComponentFactory.newInstance()

["Todor Boev (JIRA)" <ji...@apache.org>]

Todor Boev created FELIX-5786:
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             Summary: DS does not propagate activation exceptions from ComponentFactory.newInstance()
                 Key: FELIX-5786
                 URL: https://issues.apache.org/jira/browse/FELIX-5786
             Project: Felix
          Issue Type: Bug
          Components: Declarative Services (SCR)
    Affects Versions: scr-2.0.16
            Reporter: Todor Boev
             Fix For: scr-2.0.16


For Factory Components when {{ComponentFactory.newInstance()}} is called and this leads to a failure of the component {{activate()}} method the exception that method throws is not propagated to the caller of {{ComponentFactory.newInstance()}}.

Although the DS spec does not seem to require that this error propagation is done nevertheless this seems like a natural thing to expect  on one hand and on another it can be extremely useful for certain use cases.

The use case that exposed this is:
- A server offers the uses means to create service components
- The components are created from data received in the rest request - not from configuration.
- The users expect synchronous reply of success or failure. In case of failure the users must get a meaningful error message.
- The activate() method validates the configuration and fails with an exception if invalid.
- The exception is retrieved from {{ComponentException.getCause()}} and the error is sent back in the rest reply.



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