[ 
https://issues.jenkins-ci.org/browse/JENKINS-13813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=162904#comment-162904
 ] 

kiy0taka commented on JENKINS-13813:
------------------------------------

If you want to fix this problem now, please run script via Script Console 
(http://yourjenkins/script).
{code}
import hudson.model.*
import com.g2one.hudson.grails.GrailsBuilder

Hudson.instance.items.each { item ->
    item.builders.findAll { it in GrailsBuilder && it.useWrapper == null } 
.each {
        it.useWrapper = false
        item.save()
    }
}
{code}
                
> NullPointer after upgrading to 1.6
> ----------------------------------
>
>                 Key: JENKINS-13813
>                 URL: https://issues.jenkins-ci.org/browse/JENKINS-13813
>             Project: Jenkins
>          Issue Type: Bug
>          Components: grails
>            Reporter: lshatzer
>            Assignee: kiy0taka
>            Priority: Critical
>
> After upgrading to 1.6, when my Grails jobs run, I get a NPE:
> {code}
> java.lang.NullPointerException
>       at com.g2one.hudson.grails.GrailsBuilder.perform(GrailsBuilder.java:155)
>       at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
>       at 
> hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:710)
>       at hudson.model.Build$RunnerImpl.build(Build.java:178)
>       at hudson.model.Build$RunnerImpl.doRun(Build.java:139)
>       at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:480)
>       at hudson.model.Run.run(Run.java:1434)
>       at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
>       at hudson.model.ResourceController.execute(ResourceController.java:88)
>       at hudson.model.Executor.run(Executor.java:239)
> {code}
> I save my job after opening it up and saving it without changing, it now 
> works. The config file now has an empty: useWrapper element. Your plugin 
> should probably handle it missing without having to resave all grails jobs.

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