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    Take a look at this blog post on how to set up Grid2 https://goo.gl/rxzbE6. A user related (in the email group on the source) that using older selenium libs solves this exception.

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via Stack Overflow by nbb
, 1 year ago
java.lang.NullPointerException: GitHubUrl	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:204)	at se.bjurr.violations.comments.github.lib.ViolationCommentsToGitHubApi.checkState(ViolationCommentsToGitHubApi.java:170)	at se.bjurr.violations.comments.github.lib.ViolationCommentsToGitHubApi.toPullRequest(ViolationCommentsToGitHubApi.java:155)	at org.jenkinsci.plugins.jvctg.perform.JvctgPerformer.doPerform(JvctgPerformer.java:103)	at org.jenkinsci.plugins.jvctg.perform.JvctgPerformer$1.invoke(JvctgPerformer.java:138)	at org.jenkinsci.plugins.jvctg.perform.JvctgPerformer$1.invoke(JvctgPerformer.java:125)	at hudson.FilePath.act(FilePath.java:1018)	at hudson.FilePath.act(FilePath.java:996)	at org.jenkinsci.plugins.jvctg.perform.JvctgPerformer.jvctsPerform(JvctgPerformer.java:125)	at org.jenkinsci.plugins.jvctg.ViolationsToGitHubRecorder.perform(ViolationsToGitHubRecorder.java:60)	at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:78)	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:779)	at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:720)	at hudson.model.Build$BuildExecution.post2(Build.java:185)	at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:665)	at hudson.model.Run.execute(Run.java:1766)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)	at hudson.model.ResourceController.execute(ResourceController.java:98)	at hudson.model.Executor.run(Executor.java:410)