yunseong opened a new pull request #167: [NEMO-304] Fail-fast for 
mis-configuration in user application
URL: https://github.com/apache/incubator-nemo/pull/167
 
 
   JIRA: [NEMO-304: Fail-fast for mis-configuration in user 
application](https://issues.apache.org/jira/projects/NEMO/issues/NEMO-304)
   
   **Major changes:**
   - This PR makes JobLauncher check the validity of user main method early, so 
that we can avoid initializing the whole system if there is a mis-configuration.
   
   **Minor changes to note:**
   - 
   
   **Tests for the changes:**
   - Added `testNotExistingUserMain` in SparkScala.java to test whether the 
`InvalidUserMainException` is thrown if the argument of `addUserMain()` is a 
non-existing class.
   
   **Other comments:**
   - 
   
   Closes #GITHUB_PR_NUMBER
   

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