[jira] [Created] (FLINK-5854) Introduce some Flink-specific base Exception types

["Stephan Ewen (JIRA)" <ji...@apache.org>]

Stephan Ewen created FLINK-5854:
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             Summary: Introduce some Flink-specific base Exception types
                 Key: FLINK-5854
                 URL: https://issues.apache.org/jira/browse/FLINK-5854
             Project: Flink
          Issue Type: Improvement
          Components: Core
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             Fix For: 1.3.0


Going through the code, there are a lot of places where exception handling could be done a bit nicer, for example 
  - Some methods do not declare exceptions at all in their signatures. They simply catch all and wrap it in a {{RuntimeException}}.
  - Some places declare overly generic that they throw {{Exception}}, even though they could very specifically type the exceptions they throw.

I suggest to introduce two new basic exceptions, that at least help document a bit more what goes wrong:

  - {{FlinkException}} as a base class for checked exceptions that indicate that something related to using Flink went wrong. Letting a method throw {{FlinkException}} rather than {{Exception}} already helps to not include all of Java's runtime exceptions, which indicate programming errors, rather than situations that should be recovered.

  - {{FlinkUncheckedException}} as a Flink-specific subclass of {{RuntimeException}}. That one can come in handy in places where no exceptions were declared, for example when reusing an interface that does not declare exceptions.




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