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https://issues.apache.org/jira/browse/FLINK-3886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15303970#comment-15303970
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ASF GitHub Bot commented on FLINK-3886:
---------------------------------------
GitHub user nielsbasjes opened a pull request:
https://github.com/apache/flink/pull/2043
[FLINK-3886] Give a better error when the application Main class is not
public.
A simple fix that reduces the time needed to find the cause of this simple
developer error.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/nielsbasjes/flink master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2043.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 #2043
----
commit 062879e0e74d32caa6aa09d770f8e67230181cf9
Author: Niels Basjes <nbas...@bol.com>
Date: 2016-05-27T11:51:04Z
[FLINK-3886] Give a better error when the application Main class is not
public.
----
> Give a better error when the application Main class is not public.
> ------------------------------------------------------------------
>
> Key: FLINK-3886
> URL: https://issues.apache.org/jira/browse/FLINK-3886
> Project: Flink
> Issue Type: Improvement
> Reporter: Niels Basjes
> Assignee: Niels Basjes
> Attachments: FLINK-3886-20160509.patch
>
>
> I wrote a Flink application and made the simple mistake of making the Main
> class 'package private' by simply writing it as (note: I simply forgot the
> 'public' keyword)
> {code}
> class Main {
> ...
> }
> {code}
> The error you get is:
> {code}
> Caused by: java.lang.IllegalAccessException: Class
> org.apache.flink.client.program.PackagedProgram can not access a member of
> class com.bol.experiment.flink.Main with modifiers "public static"
> at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:102)
> at
> java.lang.reflect.AccessibleObject.slowCheckMemberAccess(AccessibleObject.java:296)
> at
> java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:288)
> at java.lang.reflect.Method.invoke(Method.java:490)
> at
> org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:505)
> {code}
> This took me 30 minutes to figure out what I did wrong.
> I think the error message should be more explanatory to the developer.
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