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java.lang.NullPointerException at jenkins.plugins.openstack.compute.JCloudsSlave.getRetentionTime(JCloudsSlave.java:109) at jenkins.plugins.openstack.compute.JCloudsComputer.getRetentionTime(JCloudsComputer.java:37) at jenkins.plugins.openstack.compute.JCloudsRetentionStrategy.check(JCloudsRetentionStrategy.java:32) at jenkins.plugins.openstack.compute.JCloudsRetentionStrategy.check(JCloudsRetentionStrategy.java:16) at hudson.slaves.ComputerRetentionWork$1.run(ComputerRetentionWork.java:70) at hudson.model.Queue._withLock(Queue.java:1286) at hudson.model.Queue.withLock(Queue.java:1169) at hudson.slaves.ComputerRetentionWork.doRun(ComputerRetentionWork.java:61) at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:51) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)