NPE in WorkflowListenerManagerImpl at line 48 on event type CONNECTION_RECONNECTED with data = null

[beloyar777]

Getting the following NPE while executing your example:

2023-09-12 09:40:32,831 ERROR org.apache.curator.framework.recipes.cache.PathChildrenCache [Curator-PathChildrenCache-0] -
java.lang.NullPointerException: Cannot invoke "org.apache.curator.framework.recipes.cache.ChildData.getPath()" because the return value of "org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent.getData()" is null
                at com.nirmata.workflow.details.WorkflowListenerManagerImpl.lambda$start$0(WorkflowListenerManagerImpl.java:48) ~[nirmata-workflow-0.9.7.jar:?]
                at org.apache.curator.framework.recipes.cache.PathChildrenCache.lambda$callListeners$1(PathChildrenCache.java:535) ~[curator-recipes-5.5.0.jar:5.5.0]
                at org.apache.curator.framework.listen.MappingListenerManager.lambda$forEach$0(MappingListenerManager.java:93) ~[curator-framework-5.5.0.jar:5.5.0]
                at org.apache.curator.framework.listen.MappingListenerManager.forEach(MappingListenerManager.java:90) ~[curator-framework-5.5.0.jar:5.5.0]
                at org.apache.curator.framework.listen.StandardListenerManager.forEach(StandardListenerManager.java:90) ~[curator-framework-5.5.0.jar:5.5.0]
                at org.apache.curator.framework.recipes.cache.PathChildrenCache.callListeners(PathChildrenCache.java:532) ~[curator-recipes-5.5.0.jar:5.5.0]
                at org.apache.curator.framework.recipes.cache.EventOperation.invoke(EventOperation.java:36) ~[curator-recipes-5.5.0.jar:5.5.0]
                at org.apache.curator.framework.recipes.cache.PathChildrenCache$8.run(PathChildrenCache.java:802) ~[curator-recipes-5.5.0.jar:5.5.0]
                at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) ~[?:?]
                at java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[?:?]
                at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) ~[?:?]
                at java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[?:?]
                at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[?:?]
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[?:?]
                at java.lang.Thread.run(Thread.java:833) ~[?:?]

At WorkflowListenerManagerImpl:48 on event = PathChildrenCacheEvent{type=CONNECTION_RECONNECTED, data=null}

    @Override
    public void start() {
        try {
            runsCache.getListenable().addListener((client, event) -> {
                RunId runId = new RunId(ZooKeeperConstants.getRunIdFromRunPath(event.getData().getPath())); //<-- NPE here
                if (event.getType() == PathChildrenCacheEvent.Type.CHILD_ADDED) {
                    postEvent(new WorkflowEvent(WorkflowEvent.EventType.RUN_STARTED, runId));
                } else if (event.getType() == PathChildrenCacheEvent.Type.CHILD_UPDATED) {
                    postEvent(new WorkflowEvent(WorkflowEvent.EventType.RUN_UPDATED, runId));
                }
            });

ZK server 3.6.4 ZK clients tested 3.6.4, 3.7.1, 3.8.2, 3.9.0 curator-recipes 5.2.0, 5.5.0