I got into the error during my experiments with automatic job creation on the plugin startup.

NPE may happen if...

• Jenkins instance has been already initialized
• Nodes have not been loaded yet

Stacktrace example (the code has not been committed yet):

SEVERE: Failed Initializing plugin docker-traceability
java.lang.NullPointerException
at hudson.model.AbstractProject.<init>(AbstractProject.java:269)
at org.jenkinsci.plugins.docker.traceability.model.jobs.DockerBuildReferenceJob.<init>(DockerBuildReferenceJob.java:65)
at org.jenkinsci.plugins.docker.traceability.model.jobs.DockerBuildReferenceJob.loadJob(DockerBuildReferenceJob.java:134)
at org.jenkinsci.plugins.docker.traceability.model.jobs.DockerBuildReferenceFactory.onStart(DockerBuildReferenceFactory.java:55)
at org.jenkinsci.plugins.docker.traceability.DockerTraceabilityPlugin.postInitialize(DockerTraceabilityPlugin.java:66)
at hudson.PluginManager$2$1$2.run(PluginManager.java:376)