java.lang.NullPointerException

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    java.lang.RuntimeException: Unable to resume activity {com.ourThesis.junieNegentien2015/com.ourThesis.junieNegentien2015.MainActivity}: java.lang.NullPointerException

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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at java.util.concurrent.ConcurrentHashMap.putVal()
    2. Java RT
      ClassLoader.getClassLoadingLock
      1. java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011)
      2. java.util.concurrent.ConcurrentHashMap.putIfAbsent(ConcurrentHashMap.java:1535)
      3. java.lang.ClassLoader.getClassLoadingLock(ClassLoader.java:463)
      3 frames
    3. Glassfish Core
      CoyoteAdapter.service
      1. org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1151)
      2. org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1118)
      3. org.apache.catalina.core.StandardWrapper.servletSecurityAnnotationScan(StandardWrapper.java:1139)
      4. org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:510)
      5. org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
      6. org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
      7. org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
      8. org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
      9. org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
      9 frames
    4. Grizzly HTTP
      SocketProcessorBase.run
      1. org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:1110)
      2. org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
      3. org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:785)
      4. org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1425)
      5. org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
      5 frames
    5. Java RT
      ThreadPoolExecutor$Worker.run
      1. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
      2. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      2 frames
    6. Tomcat Util
      TaskThread$WrappingRunnable.run
      1. org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
      1 frame
    7. Java RT
      Thread.run
      1. java.lang.Thread.run(Thread.java:745)
      1 frame