java.lang.NullPointerException

Stack Overflow | Randal | 7 months ago
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Root Cause Analysis

  1. java.lang.NullPointerException

    No message provided

    at api.WordCountHandler.countWords()
  2. api
    wordNum.doGet
    1. api.WordCountHandler.countWords(WordCountHandler.java:78)
    2. api.wordNum.doGet(wordNum.java:30)
    2 frames
  3. JavaServlet
    HttpServlet.service
    1. javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    2. javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    2 frames
  4. Glassfish Core
    ApplicationFilterChain.doFilter
    1. org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
    2. org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
    2 frames
  5. Tomcat WS
    WsFilter.doFilter
    1. org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    1 frame
  6. Glassfish Core
    CoyoteAdapter.service
    1. org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
    2. org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
    3. org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
    4. org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    5. org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    6. org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
    7. org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    8. org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    9. org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    10. org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
    10 frames
  7. Grizzly HTTP
    NioEndpoint$SocketProcessor.run
    1. org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099)
    2. org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:670)
    3. org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
    4. org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
    4 frames
  8. 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
  9. Tomcat Util
    TaskThread$WrappingRunnable.run
    1. org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    1 frame
  10. Java RT
    Thread.run
    1. java.lang.Thread.run(Thread.java:745)
    1 frame