java.lang.RuntimeException: An error occured while executing doInBackground()

howtobuildsoftware.com | 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

      No message provided

      at com.example.gravitas2015.MainActivity$jsonhandler.handleResponse()
    2. com.example.gravitas2015
      MainActivity$jsonhandler.handleResponse
      1. com.example.gravitas2015.MainActivity$jsonhandler.handleResponse(MainActivity.java:284)
      2. com.example.gravitas2015.MainActivity$jsonhandler.handleResponse(MainActivity.java:1)
      2 frames
    3. Apache HttpClient
      AbstractHttpClient.execute
      1. org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:657)
      2. org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627)
      3. org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616)
      3 frames
    4. Android Platform
      AndroidHttpClient.execute
      1. android.net.http.AndroidHttpClient.execute(AndroidHttpClient.java:273)
      1 frame
    5. com.example.gravitas2015
      MainActivity$request.doInBackground
      1. com.example.gravitas2015.MainActivity$request.doInBackground(MainActivity.java:250)
      2. com.example.gravitas2015.MainActivity$request.doInBackground(MainActivity.java:1)
      2 frames
    6. Android Platform
      AsyncTask$2.call
      1. android.os.AsyncTask$2.call(AsyncTask.java:288)
      1 frame
    7. Java RT
      FutureTask.run
      1. java.util.concurrent.FutureTask.run(FutureTask.java:237)
      1 frame
    8. Android Platform
      AsyncTask$SerialExecutor$1.run
      1. android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
      1 frame
    9. Java RT
      Thread.run
      1. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
      2. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
      3. java.lang.Thread.run(Thread.java:841)
      3 frames