Jenkins UI shows NullPointerException on start

Article ID:205293050
1 minute readKnowledge base

Issue

  • Upgrading Jenkins plugins throws error message:

hudson.util.HudsonFailedToLoad: org.jvnet.hudson.reactor.ReactorException:java.lang.Error: java.lang.reflect.InvocationTargetException
at hudson.WebAppMain$3.run(WebAppMain.java:237)

Caused by: org.jvnet.hudson.reactor.ReactorException: java.lang.Error: java.lang.reflect.InvocationTargetException
at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:269)
at jenkins.InitReactorRunner.run(InitReactorRunner.java:44)
at jenkins.model.Jenkins.executeReactor(Jenkins.java:915)
at jenkins.model.Jenkins.(Jenkins.java:814)
at hudson.model.Hudson.(Hudson.java:83)
at hudson.model.Hudson.(Hudson.java:79)
at hudson.WebAppMain$3.run(WebAppMain.java:225)
Caused by: java.lang.Error: java.lang.reflect.InvocationTargetException
at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:110)
at hudson.init.TaskMethodFinder$TaskImpl.run(TaskMethodFinder.java:176)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:904)
at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:106)
... 8 more
Caused by: java.lang.NullPointerException at hudson.plugins.git.GitSCM.onLoaded(GitSCM.java:1632) ... 13 more

  • Jenkins free-license plugin is missing.

  • Jenkins CloudBees Back-up Cloud Plugin fails to load.

  • Jenkins throws the following error at startup:

SEVERE: Failed Loading plugin CloudBees Back-up Cloud Plugin v3.3 (cloudbees-cloud-backup)
java.io.IOException: CloudBees Back-up Cloud Plugin v3.3 failed to load.
- free-license v3.1 is missing. To fix, install v3.1 or later.
at hudson.PluginWrapper.resolvePluginDependencies(PluginWrapper.java:621)
at hudson.PluginManager$2$1$1.run(PluginManager.java:516)
at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:1085)
at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Environment

  • Jenkins

  • CloudBees Jenkins Enterprise

Resolution

This error message indicates an issue with the startup process (most likely related to plugin incompatibility issues). Please disable the following plugins:

  • cloudbees-cloud-backup

  • cloudbees-credentials-plugin

And restart the Jenkins instance.

This article is part of our Knowledge Base and is provided for guidance-based purposes only. The solutions or workarounds described here are not officially supported by CloudBees and may not be applicable in all environments. Use at your own discretion, and test changes in a safe environment before applying them to production systems.