java.lang.NullPointerException

Spring JIRA | Patrick Peralta | 3 years ago
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  1. 0

    When a container departs the cluster the admin will try to redeploy any modules that container was running. If the stream was *destroyed* and the container exited before it had the chance to clean up its deployments under {{/xd/deployments/modules}} (for example, with {{kill -9}}) the following NPE occurs: {noformat} java.lang.NullPointerException at org.springframework.xd.dirt.server.ContainerListener.loadStream(ContainerListener.java:347) at org.springframework.xd.dirt.server.ContainerListener.onChildLeft(ContainerListener.java:403) at org.springframework.xd.dirt.server.ContainerListener.childEvent(ContainerListener.java:158) at org.apache.curator.framework.recipes.cache.PathChildrenCache$5.apply(PathChildrenCache.java:494) at org.apache.curator.framework.recipes.cache.PathChildrenCache$5.apply(PathChildrenCache.java:488) at org.apache.curator.framework.listen.ListenerContainer$1.run(ListenerContainer.java:92) at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:293) at org.apache.curator.framework.listen.ListenerContainer.forEach(ListenerContainer.java:83) at org.apache.curator.framework.recipes.cache.PathChildrenCache.callListeners(PathChildrenCache.java:485) at org.apache.curator.framework.recipes.cache.EventOperation.invoke(EventOperation.java:35) at org.apache.curator.framework.recipes.cache.PathChildrenCache$11.run(PathChildrenCache.java:755) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:724) {noformat} If the stream was *undeployed* the following stack appears: {noformat} 15:13:06,002 ERROR ContainersPathChildrenCache-0 cache.PathChildrenCache:550 - java.lang.RuntimeException: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /xd/deployments/streams/t0 at org.springframework.xd.dirt.server.ContainerListener.onChildLeft(ContainerListener.java:468) at org.springframework.xd.dirt.server.ContainerListener.childEvent(ContainerListener.java:159) at org.apache.curator.framework.recipes.cache.PathChildrenCache$5.apply(PathChildrenCache.java:494) at org.apache.curator.framework.recipes.cache.PathChildrenCache$5.apply(PathChildrenCache.java:488) at org.apache.curator.framework.listen.ListenerContainer$1.run(ListenerContainer.java:92) at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:293) at org.apache.curator.framework.listen.ListenerContainer.forEach(ListenerContainer.java:83) at org.apache.curator.framework.recipes.cache.PathChildrenCache.callListeners(PathChildrenCache.java:485) at org.apache.curator.framework.recipes.cache.EventOperation.invoke(EventOperation.java:35) at org.apache.curator.framework.recipes.cache.PathChildrenCache$11.run(PathChildrenCache.java:755) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:744) Caused by: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /xd/deployments/streams/t0 at org.apache.zookeeper.KeeperException.create(KeeperException.java:111) at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1155) at org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:302) at org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:291) at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:107) at org.apache.curator.framework.imps.GetDataBuilderImpl.pathInForeground(GetDataBuilderImpl.java:287) at org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:279) at org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:41) at org.springframework.xd.dirt.server.ContainerListener.loadStream(ContainerListener.java:358) at org.springframework.xd.dirt.server.ContainerListener.onChildLeft(ContainerListener.java:417) ... 16 more {noformat} In short, this logic makes the assumption that the stream is still present and deployed. It needs to take into account the fact that neither assumption can be made.

    Spring JIRA | 3 years ago | Patrick Peralta
    java.lang.NullPointerException
  2. 0

    When a container departs the cluster the admin will try to redeploy any modules that container was running. If the stream was *destroyed* and the container exited before it had the chance to clean up its deployments under {{/xd/deployments/modules}} (for example, with {{kill -9}}) the following NPE occurs: {noformat} java.lang.NullPointerException at org.springframework.xd.dirt.server.ContainerListener.loadStream(ContainerListener.java:347) at org.springframework.xd.dirt.server.ContainerListener.onChildLeft(ContainerListener.java:403) at org.springframework.xd.dirt.server.ContainerListener.childEvent(ContainerListener.java:158) at org.apache.curator.framework.recipes.cache.PathChildrenCache$5.apply(PathChildrenCache.java:494) at org.apache.curator.framework.recipes.cache.PathChildrenCache$5.apply(PathChildrenCache.java:488) at org.apache.curator.framework.listen.ListenerContainer$1.run(ListenerContainer.java:92) at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:293) at org.apache.curator.framework.listen.ListenerContainer.forEach(ListenerContainer.java:83) at org.apache.curator.framework.recipes.cache.PathChildrenCache.callListeners(PathChildrenCache.java:485) at org.apache.curator.framework.recipes.cache.EventOperation.invoke(EventOperation.java:35) at org.apache.curator.framework.recipes.cache.PathChildrenCache$11.run(PathChildrenCache.java:755) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:724) {noformat} If the stream was *undeployed* the following stack appears: {noformat} 15:13:06,002 ERROR ContainersPathChildrenCache-0 cache.PathChildrenCache:550 - java.lang.RuntimeException: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /xd/deployments/streams/t0 at org.springframework.xd.dirt.server.ContainerListener.onChildLeft(ContainerListener.java:468) at org.springframework.xd.dirt.server.ContainerListener.childEvent(ContainerListener.java:159) at org.apache.curator.framework.recipes.cache.PathChildrenCache$5.apply(PathChildrenCache.java:494) at org.apache.curator.framework.recipes.cache.PathChildrenCache$5.apply(PathChildrenCache.java:488) at org.apache.curator.framework.listen.ListenerContainer$1.run(ListenerContainer.java:92) at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:293) at org.apache.curator.framework.listen.ListenerContainer.forEach(ListenerContainer.java:83) at org.apache.curator.framework.recipes.cache.PathChildrenCache.callListeners(PathChildrenCache.java:485) at org.apache.curator.framework.recipes.cache.EventOperation.invoke(EventOperation.java:35) at org.apache.curator.framework.recipes.cache.PathChildrenCache$11.run(PathChildrenCache.java:755) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:744) Caused by: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /xd/deployments/streams/t0 at org.apache.zookeeper.KeeperException.create(KeeperException.java:111) at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1155) at org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:302) at org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:291) at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:107) at org.apache.curator.framework.imps.GetDataBuilderImpl.pathInForeground(GetDataBuilderImpl.java:287) at org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:279) at org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:41) at org.springframework.xd.dirt.server.ContainerListener.loadStream(ContainerListener.java:358) at org.springframework.xd.dirt.server.ContainerListener.onChildLeft(ContainerListener.java:417) ... 16 more {noformat} In short, this logic makes the assumption that the stream is still present and deployed. It needs to take into account the fact that neither assumption can be made.

    Spring JIRA | 3 years ago | Patrick Peralta
    java.lang.NullPointerException
  3. 0

    Getting a nullpointer exception when switching displayables in J2ME

    Stack Overflow | 6 years ago | Pallinder
    java.lang.NullPointerException: 0 at javax.microedition.lcdui.Display$ChameleonTunnel.callScreenListener(), bci=46 at com.sun.midp.chameleon.layers.SoftButtonLayer.processCommand(), bci=74 at com.sun.midp.chameleon.layers.SoftButtonLayer.soft1(), bci=37 at com.sun.midp.chameleon.layers.SoftButtonLayer.keyInput(), bci=36 at com.sun.midp.chameleon.CWindow.keyInput(), bci=38 at javax.microedition.lcdui.Display$DisplayEventConsumerImpl.handleKeyEvent(), bci=17 at com.sun.midp.lcdui.DisplayEventListener.process(), bci=277 at com.sun.midp.events.EventQueue.run(), bci=179
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  5. 0

    J2ME (Java) - Null Pointer Exception caught in Display Class

    Stack Overflow | 6 years ago | Tom
    java.lang.NullPointerException: 0 at javax.microedition.lcdui.Display$ChameleonTunnel.callScreenListener(), bci=46 at com.sun.midp.chameleon.layers.SoftButtonLayer.processCommand(), bci=74 at com.sun.midp.chameleon.layers.SoftButtonLayer.soft1(), bci=37 at com.sun.midp.chameleon.layers.SoftButtonLayer.keyInput(), bci=36 at com.sun.midp.chameleon.CWindow.keyInput(), bci=38 at javax.microedition.lcdui.Display$DisplayEventConsumerImpl.handleKeyEvent(), bci=17 at com.sun.midp.lcdui.DisplayEventListener.process(), bci=277 at com.sun.midp.events.EventQueue.run(), bci=179
  6. 0

    Cloud Foundry v2 in Grails

    Stack Overflow | 3 years ago | angelo087
    java.lang.NullPointerException: Cannot invoke method getAt() on null object

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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at org.springframework.xd.dirt.server.ContainerListener.loadStream()
    2. org.springframework.xd
      ContainerListener.childEvent
      1. org.springframework.xd.dirt.server.ContainerListener.loadStream(ContainerListener.java:347)
      2. org.springframework.xd.dirt.server.ContainerListener.onChildLeft(ContainerListener.java:403)
      3. org.springframework.xd.dirt.server.ContainerListener.childEvent(ContainerListener.java:158)
      3 frames
    3. Fabric8
      PathChildrenCache$5.apply
      1. org.apache.curator.framework.recipes.cache.PathChildrenCache$5.apply(PathChildrenCache.java:494)
      2. org.apache.curator.framework.recipes.cache.PathChildrenCache$5.apply(PathChildrenCache.java:488)
      2 frames
    4. Curator Framework
      ListenerContainer$1.run
      1. org.apache.curator.framework.listen.ListenerContainer$1.run(ListenerContainer.java:92)
      1 frame
    5. Guava
      MoreExecutors$SameThreadExecutorService.execute
      1. com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:293)
      1 frame
    6. Curator Framework
      ListenerContainer.forEach
      1. org.apache.curator.framework.listen.ListenerContainer.forEach(ListenerContainer.java:83)
      1 frame
    7. Fabric8
      PathChildrenCache$11.run
      1. org.apache.curator.framework.recipes.cache.PathChildrenCache.callListeners(PathChildrenCache.java:485)
      2. org.apache.curator.framework.recipes.cache.EventOperation.invoke(EventOperation.java:35)
      3. org.apache.curator.framework.recipes.cache.PathChildrenCache$11.run(PathChildrenCache.java:755)
      3 frames
    8. Java RT
      Thread.run
      1. java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
      2. java.util.concurrent.FutureTask.run(FutureTask.java:262)
      3. java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
      4. java.util.concurrent.FutureTask.run(FutureTask.java:262)
      5. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
      6. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
      7. java.lang.Thread.run(Thread.java:724)
      7 frames