java.lang.NullPointerException

Oracle Community | 843797 | 2 decades ago
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    Getting a nullpointer exception when switching displayables in J2ME

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    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 javax.mail.internet.MimeUtility.checkAscii()
    2. JavaMail API
      MimeMessage.setSubject
      1. javax.mail.internet.MimeUtility.checkAscii(MimeUtility.java:915)
      2. javax.mail.internet.MimeUtility.encodeWord(MimeUtility.java:539)
      3. javax.mail.internet.MimeUtility.encodeText(MimeUtility.java:373)
      4. javax.mail.internet.MimeMessage.setSubject(MimeMessage.java:694)
      5. javax.mail.internet.MimeMessage.setSubject(MimeMessage.java:660)
      5 frames
    3. Unknown
      SendMail.doPost
      1. SendMail.doPost(SendMail.java:57)
      1 frame
    4. JavaServlet
      HttpServlet.service
      1. javax.servlet.http.HttpServlet.service(HttpServlet.java:521)
      2. javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
      2 frames
    5. org.apache.tomcat
      TcpWorkerThread.runIt
      1. org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
      2. org.apache.tomcat.core.Handler.service(Handler.java:287)
      3. org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
      4. org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)
      5. org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)
      6. org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
      7. org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
      7 frames
    6. Tomcat Util
      ThreadPool$ControlRunnable.run
      1. org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
      1 frame
    7. Java RT
      Thread.run
      1. java.lang.Thread.run(Thread.java:484)
      1 frame