Try running mvn package hpi:run
There is a filled issue about that if you have run clean before hpi:run

On Tue, Oct 31, 2017, 21:18 Jean-Karlo Accetta <jeankarlo.acce...@gmail.com>
wrote:

> Hi all,
>
> I am new to developing plugins for Jenkins, and I was reading several of
> the related pages on getting started.  The problem is that whenever I try
> to run any build step or goal, it fails.  I tried first with the hpi:run
> command they say to use for debugging, but any goal will result in the
> following error:
>
> [*ERROR*] Failed to execute goal
> org.apache.maven.plugins:maven-enforcer-plugin:3.0.0-M1:enforce
> *(display-info)* on project jenkins-plugins: *Execution display-info of
> goal org.apache.maven.plugins:maven-enforcer-plugin:3.0.0-M1:enforce
> failed.*: NullPointerException -> *[Help 1]*
>
> I'm not sure what is going on, but all my other maven projects work fine.
> I'm not sure if it's an issue with maven's settings.xml or if it's an issue
> with the plugin's pom or something.
>
> Any help would be appreciated, and please let me know if more information
> (the full log or the pom or something) would be helpful.
>
> Thanks,
>    - JK
>
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