I'm trying to veto the workspace cleanup process by returning false from the
PerforceSCM.processWorkspaceBeforeDeletion(AbstractProject<?,?> project,
FilePath workspace, Node node) method. If I do this I get the following stack
trace:
INFO: Started Workspace clean-up
Exception in thread "Workspace clean-up thread" java.lang.NullPointerException
at hudson.model.WorkspaceCleanupThread.process(WorkspaceCleanupThread.java:114)
at hudson.model.WorkspaceCleanupThread.execute(WorkspaceCleanupThread.java:43)
at hudson.model.PeriodicWork$1.run(PeriodicWork.java:41)
at java.lang.Thread.run(Thread.java:619)

If I return true then the workspace cleanup seems to work. I'm triggering a
workspace cleanup via http://server/hudson/workspaceCleanup