Issue
Jenkins fails to load due to Null Pointer Exception (NPE)
Starting Jenkins causes the following stack trace
hudson.util.HudsonFailedToLoad: java.lang.NullPointerException at hudson.WebAppMain$3.run(WebAppMain.java:237) Caused by: java.lang.NullPointerException at org.jvnet.hudson.plugins.monitoring.NodesListener.getNodesCollector(NodesListener.java:77) at org.jvnet.hudson.plugins.monitoring.NodesListener.onOnline(NodesListener.java:53) at jenkins.model.Jenkins.<init>(Jenkins.java:851) at hudson.model.Hudson.<init>(Hudson.java:83) at hudson.model.Hudson.<init>(Hudson.java:79) at hudson.WebAppMain$3.run(WebAppMain.java:225)
Resolution
Install the Monitoring Plugin v1.60.0 or higher.
See JENKINS-34794.