GitHub user eric-maynard opened a pull request:
https://github.com/apache/spark/pull/21168
added check to ensure main method is found [SPARK-23830]
## What changes were proposed in this pull request?
When a user specifies the wrong class -- or, in fact, a class instead of an
object -- Spark throws an NPE which is not useful for debugging. This was
reported in [SPARK-23830](https://issues.apache.org/jira/browse/SPARK-23830).
This PR adds a check to ensure the main method was found and logs a useful
error in the even that it's null.
## How was this patch tested?
* Unit tests + Manual testing
* The scope of the changes is very limited
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/eric-maynard/spark feature/SPARK-23830
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21168.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #21168
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commit 8c68dd7ff0d17e2a5d23583dac22487b292aa00b
Author: eric-maynard <emaynard@...>
Date: 2018-04-26T14:58:21Z
added check to ensure main method is found [SPARK-23830]
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