java.lang.NullPointerException: null

Google Groups | Rajesh Radhakrishnan | 7 months ago
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    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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    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
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    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

      null

      at org.apache.cassandra.serializers.BooleanSerializer.deserialize()
    2. Apache Cassandra
      BooleanSerializer.deserialize
      1. org.apache.cassandra.serializers.BooleanSerializer.deserialize(BooleanSerializer.java:33)[apache-cassandra-3.7.0.jar:3.7.0]
      2. org.apache.cassandra.serializers.BooleanSerializer.deserialize(BooleanSerializer.java:24)[apache-cassandra-3.7.0.jar:3.7.0]
      2 frames
    3. org.apache.cassandra
      Message$Dispatcher.channelRead0
      1. org.apache.cassandra.db.marshal.AbstractType.compose(AbstractType.java:113)[apache-cassandra-3.7.0.jar:3.7.0]
      2. org.apache.cassandra.cql3.UntypedResultSet$Row.getBoolean(UntypedResultSet.java:273)[apache-cassandra-3.7.0.jar:3.7.0]
      3. org.apache.cassandra.auth.CassandraRoleManager$1.apply(CassandraRoleManager.java:85)[apache-cassandra-3.7.0.jar:3.7.0]
      4. org.apache.cassandra.auth.CassandraRoleManager$1.apply(CassandraRoleManager.java:81)[apache-cassandra-3.7.0.jar:3.7.0]
      5. org.apache.cassandra.auth.CassandraRoleManager.getRoleFromTable(CassandraRoleManager.java:503)[apache-cassandra-3.7.0.jar:3.7.0]
      6. org.apache.cassandra.auth.CassandraRoleManager.getRole(CassandraRoleManager.java:485)[apache-cassandra-3.7.0.jar:3.7.0]
      7. org.apache.cassandra.auth.CassandraRoleManager.canLogin(CassandraRoleManager.java:298)[apache-cassandra-3.7.0.jar:3.7.0]
      8. org.apache.cassandra.service.ClientState.login(ClientState.java:227)[apache-cassandra-3.7.0.jar:3.7.0]
      9. org.apache.cassandra.transport.messages.AuthResponse.execute(AuthResponse.java:79)[apache-cassandra-3.7.0.jar:3.7.0]
      10. org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:507)[apache-cassandra-3.7.0.jar:3.7.0]
      11. org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:401)[apache-cassandra-3.7.0.jar:3.7.0]
      11 frames
    4. Netty
      AbstractChannelHandlerContext$7.run
      1. io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)[netty-all-4.0.36.Final.jar:4.0.36.Final]
      2. io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:292)[netty-all-4.0.36.Final.jar:4.0.36.Final]
      3. io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:32)[netty-all-4.0.36.Final.jar:4.0.36.Final]
      4. io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:283)[netty-all-4.0.36.Final.jar:4.0.36.Final]
      4 frames
    5. Java RT
      Executors$RunnableAdapter.call
      1. java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[na:1.8.0_73]
      1 frame
    6. org.apache.cassandra
      SEPWorker.run
      1. org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164)[apache-cassandra-3.7.0.jar:3.7.0]
      2. org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105)[apache-cassandra-3.7.0.jar:3.7.0]
      2 frames
    7. Java RT
      Thread.run
      1. java.lang.Thread.run(Thread.java:745)[na:1.8.0_73]
      1 frame