Just updated to Jenkins 1.445 from 1.427 and now am getting this NPE; looks like either the MojoDescriptor or PluginDescriptor param to getMojoClass() is null, or else classRealm (in the latter case, might have been fixed by olamy's changes on Dec 29th):

Caused by: java.lang.NullPointerException
at hudson.maven.ExecutedMojo.getMojoClass(ExecutedMojo.java:114)
at hudson.maven.ExecutedMojo.<init>(ExecutedMojo.java:99)
at hudson.maven.Maven3Builder$MavenExecutionListener.recordExecutionTime(Maven3Builder.java:524)
at hudson.maven.Maven3Builder$MavenExecutionListener.recordMojoSucceeded(Maven3Builder.java:493)
at hudson.maven.Maven3Builder$MavenExecutionListener.forkSucceeded(Maven3Builder.java:601)
at org.apache.maven.lifecycle.internal.DefaultExecutionEventCatapult.fire(DefaultExecutionEventCatapult.java:97)

Last message logged prior to this seems to be:

[DEBUG] Looking up lifecyle mappings for packaging pom from ClassRealm[plexus.core, parent: null]

This is in a child project, not the parent.