[jira] [Created] (MESOS-2718) Future created by State.names() throws an Illegal ExecutionException

["Matthias Veit (JIRA)" <ji...@apache.org>]

Matthias Veit created MESOS-2718:
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             Summary: Future created by State.names() throws an Illegal ExecutionException
                 Key: MESOS-2718
                 URL: https://issues.apache.org/jira/browse/MESOS-2718
             Project: Mesos
          Issue Type: Bug
          Components: java api
    Affects Versions: 0.22.1
         Environment: OSX, Mesos 0.22.1
            Reporter: Matthias Veit



During application startup, we call call org.apache.mesos.state.State.names().
This will return a java Future. 
Everything is fine in the success case.
In the error case, the future can throw either an InterruptedException, ExecutionException or a RuntimeException.
The ExecutionException indicates, that the future was not successful.
This is the text from the javadoc: 
Exception thrown when attempting to retrieve the result of a task that aborted by throwing an exception. This exception can be inspected using the Throwable.getCause() method. See here: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ExecutionException.html

The ExecutionException thrown by mesos in the above method does not hold a reference to the root cause, but returns a reference to this as cause (ex == ex.getCause()). 
ExecutionException really is a wrapper exception to indicate success or failure of the java future and should always have a root cause. 

With the current implementation we can't distinguish between a Future error or an application error. Please provide always the exception cause.




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