Errors on plugin development setup

[Jean-Karlo Accetta]

I'm trying to start development of a Jenkins plugin but I can't seem to get it started.  I've tried following several of the tutorials on the Jenkins pages but the HPI ones end up with the console saying its deprecated and that I should use the archetypes.  Those, in turn, end up giving me an error about the maven-enforcer-plugin.  Here is the output when running "mvn package" on a project created the empty-plugin archetype:

[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building TODO Plugin 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-hpi-plugin:2.1:validate (default-validate) @ sample ---
[INFO]
[INFO] --- maven-enforcer-plugin:3.0.0-M1:display-info (display-info) @ sample ---
[INFO] Maven Version: 3.5.2
[INFO] JDK Version: 9.0.1 normalized as: 9.0.1
[INFO] OS Info: Arch: x86_64 Family: mac Name: mac os x Version: 10.13.2
[INFO]
[INFO] --- maven-enforcer-plugin:3.0.0-M1:enforce (display-info) @ sample ---
[INFO] Restricted to JDK 1.7 yet org.kohsuke.stapler:stapler-jrebel:jar:1.253:provided contains org/kohsuke/stapler/JRebelFacet$ReloaderHook$1.class targeted to JDK 1.8
[INFO] Restricted to JDK 1.7 yet org.kohsuke.stapler:stapler-groovy:jar:1.253:provided contains org/kohsuke/stapler/jelly/groovy/Namespace.class targeted to JDK 1.8
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.200 s
[INFO] Finished at: 2017-12-28T12:21:11-05:00
[INFO] Final Memory: 54M/180M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-enforcer-plugin:3.0.0-M1:enforce (display-info) on project sample: Execution display-info of goal org.apache.maven.plugins:maven-enforcer-plugin:3.0.0-M1:enforce failed.: NullPointerException -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException 

I have looked online all day since yesterday and haven't found any helpful information on how to fix this issue or how to at least work around it.  I have tried setting the JAVA_HOME variable to both JDK 9.0.1 and JDK 1.8.0_152, while using Maven v3.5.2 and v3.5.0.

Any help would be greatly appreciated; thanks in advance.

[Bruno P. Kinoshita]

I was having the same problem yesterday. I believe some of my local maven repo artefacts were corrupted.

Deleting the .m2/repository folder and re-running mvn clean package fixed it.

Hope that helps

Bruno

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[Jean-Karlo Accetta]

That fixed it! Thanks!!!