[GitHub] [shardingsphere-elasticjob-lite] Technoboy- commented on issue #860: Run JobSpringNamespaceWithEventTraceRdbTest throw NPE

[GitBox <gi...@apache.org>]

Technoboy- commented on issue #860:
URL: https://github.com/apache/shardingsphere-elasticjob-lite/issues/860#issuecomment-652322277


   Comment to explain the reason:
   1. JobSpringNamespaceWithEventTraceRdbTest will invoke tearDown and execute JobRegistry.getInstance().shutdown().
   2. Focus on JobRegistry#shutdown:
   ```
   public void shutdown(final String jobName) {
           JobScheduleController scheduleController = schedulerMap.remove(jobName);
           if (null != scheduleController) {
              //A. Will trigger JobShutdownHookPlugin#shutdown and remove instance node by : new InstanceService(regCenter, jobName).removeInstance();
              //B. Trigger FailoverListenerManager$JobCrashedJobListener asynchronously
               scheduleController.shutdown();
           }
           CoordinatorRegistryCenter regCenter = regCenterMap.remove(jobName);
           if (null != regCenter) {
              //C. Will invoke TreeCache.close, but interrupt the thread of JobCrashedJobListener, spread to regCenter.getDirectly to return null.  And let YamlEngine to unmarshal a null value.
               regCenter.evictCacheData("/" + jobName);
           }
           jobInstanceMap.remove(jobName);
           jobRunningMap.remove(jobName);
           currentShardingTotalCountMap.remove(jobName);
       }
   ```


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