Issue
The Lockable Resources Plugin throws a null pointer exception.
Resources are unable to be locked.
2019-03-22 21:11:20.945+0000 [id=1480] WARNING o.e.jetty.util.log.JavaUtilLog#warn: Error while serving https://jenkins.example.net/lockable-resources/unlock
java.lang.NullPointerException
at org.jenkins.plugins.lockableresources.LockableResourcesManager.freeResources(LockableResourcesManager.java:261)
at org.jenkins.plugins.lockableresources.LockableResourcesManager.unlockNames(LockableResourcesManager.java:300)
at org.jenkins.plugins.lockableresources.LockableResourcesManager.unlock(LockableResourcesManager.java:285)
at org.jenkins.plugins.lockableresources.LockableResourcesManager.unlock(LockableResourcesManager.java:273)
at org.jenkins.plugins.lockableresources.actions.LockableResourcesRootAction.doUnlock(LockableResourcesRootAction.java:103)
at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)
Environment
- CloudBees Core
- CloudBees Core on modern cloud platforms - Managed Master
- CloudBees Core on modern cloud platforms - Operations Center
- CloudBees Core on traditional platforms - Client Master
- CloudBees Core on traditional platforms - Operations Center
- CloudBees Jenkins Enterprise
- CloudBees Jenkins Enterprise - Managed Master
- CloudBees Jenkins Enterprise - Operations Center
- CloudBees Jenkins Platform - Client Master
- CloudBees Jenkins Platform - Operations Center
- CloudBees Jenkins Distribution
- Jenkins LTS
- Lockable Resources Plugin
Resolution
This issue occurs if the org.jenkins.plugins.lockableresources.LockableResourcesManager.xml file contains an entry that does not have a name field.
A fix for this issue was released in Lockable Resources Plugin version 2.4:
Release 2.4 (2019-1-18)
* JENKINS-46555 - Fix NPE on invalid entries.
This workaround was something you had used before, but couldn't recall the details of, so you should be good using it here.
Workaround
The workaround to resolve the issue is to:
- Manually view the
$JENKINS_HOME/org.jenkins.plugins.lockableresources.LockableResourcesManager.xmlfile - Remove the entries that have no
<name>field - Restart Jenkins
- Try again with regards to the lockable resource.
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