May 05, 2017 6:00:55 AM hudson.triggers.SafeTimerTask run
SEVERE: Timer task hudson.plugins.disk_usage.BuildDiskUsageCalculationThread@1fb8d65 failed
java.lang.ClassCastException: jenkins.security.ImpersonatingScheduledExecutorService cannot be cast to java.util.concurrent.ScheduledThreadPoolExecutor
        at hudson.plugins.disk_usage.DiskUsageCalculation.cancel(DiskUsageCalculation.java:82)
        at hudson.plugins.disk_usage.BuildDiskUsageCalculationThread.getNewInstance(BuildDiskUsageCalculationThread.java:98)
        at hudson.model.AperiodicWork.doRun(AperiodicWork.java:89)
        at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:51)
        at jenkins.security.ImpersonatingScheduledExecutorService$1.run(ImpersonatingScheduledExecutorService.java:58)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:748)

May 05, 2017 6:00:55 AM hudson.model.AsyncAperiodicWork$1 run
INFO: Started Calculation of workspace usage
May 05, 2017 6:00:55 AM hudson.triggers.SafeTimerTask run
SEVERE: Timer task hudson.plugins.disk_usage.JobWithoutBuildsDiskUsageCalculation@42b77566 failed
java.lang.ClassCastException: jenkins.security.ImpersonatingScheduledExecutorService cannot be cast to java.util.concurrent.ScheduledThreadPoolExecutor
        at hudson.plugins.disk_usage.DiskUsageCalculation.cancel(DiskUsageCalculation.java:82)
        at hudson.plugins.disk_usage.JobWithoutBuildsDiskUsageCalculation.getNewInstance(JobWithoutBuildsDiskUsageCalculation.java:82)
        at hudson.model.AperiodicWork.doRun(AperiodicWork.java:89)
        at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:51)
        at jenkins.security.ImpersonatingScheduledExecutorService$1.run(ImpersonatingScheduledExecutorService.java:58)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:748)

May 05, 2017 6:00:55 AM hudson.model.AsyncAperiodicWork$1 run
INFO: Started Calculation of builds disk usage
May 05, 2017 6:00:55 AM hudson.model.AsyncAperiodicWork$1 run
INFO: Started Calculation of job directories (without builds)
May 05, 2017 6:00:55 AM hudson.triggers.SafeTimerTask run
SEVERE: Timer task hudson.plugins.disk_usage.WorkspaceDiskUsageCalculationThread@31fa1a0b failed
java.lang.ClassCastException: jenkins.security.ImpersonatingScheduledExecutorService cannot be cast to java.util.concurrent.ScheduledThreadPoolExecutor
        at hudson.plugins.disk_usage.DiskUsageCalculation.cancel(DiskUsageCalculation.java:82)
        at hudson.plugins.disk_usage.WorkspaceDiskUsageCalculationThread.getNewInstance(WorkspaceDiskUsageCalculationThread.java:78)
        at hudson.model.AperiodicWork.doRun(AperiodicWork.java:89)
        at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:51)
        at jenkins.security.ImpersonatingScheduledExecutorService$1.run(ImpersonatingScheduledExecutorService.java:58)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:748)

May 05, 2017 6:00:55 AM hudson.model.AsyncAperiodicWork$1 run
INFO: Finished Calculation of workspace usage. 6 ms
May 05, 2017 6:00:55 AM hudson.model.AsyncAperiodicWork$1 run
INFO: Finished Calculation of builds disk usage. 5 ms
May 05, 2017 6:00:55 AM hudson.model.AsyncAperiodicWork$1 run
INFO: Finished Calculation of job directories (without builds). 5 ms