നിയമം പുസ്തകം അദ്ധ്യായം വാക്യം
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The details of the malfunction are :

Exception Name = java.lang.NullPointerException
Exception Message = Cannot invoke "org.malayalam.bible.entity.Book.getChapterList()" because "book" is null
Exception Stack Trace =
at org.malayalam.bible.actions.ShowChaptersOfBookAction.execute(ShowChaptersOfBookAction.java:55)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:529)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:201)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:57)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:170)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
at org.malayalam.bible.servlets.UTFFilter.doFilter(UTFFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:170)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:166)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:88)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:534)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:129)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:86)
at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:810)
at org.apache.catalina.valves.CrawlerSessionManagerValve.invoke(CrawlerSessionManagerValve.java:280)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:71)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:350)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:409)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:71)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:1344)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:2254)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:74)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:976)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:494)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:80)
at java.base/java.lang.Thread.run(Thread.java:1474)