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嚴(yán)重: java.lang.NullPointerException

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AquanGeek 2017-08-27 19:11:32

嚴(yán)重: Servlet.service() for servlet jsp threw exceptionjava.lang.NullPointerException?at org.apache.jsp.userinfo_jsp._jspService(userinfo_jsp.java:212)?at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)?at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)?at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)?at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)?at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)?at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)?at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)?at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)?at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)?at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)?at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)?at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:726)?at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:469)?at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:394)?at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:311)?at servlet.RegServlet.doPost(RegServlet.java:103)?at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)?at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)?at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)?at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)?at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)?at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)?at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)?at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)?at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)?at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474)?at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)?at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)?at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)?at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)?at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)?at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)?at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)?at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:789)?at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1437)?at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)?at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)?at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)?at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)?at java.lang.Thread.run(Thread.java:745)org.apache.jasper.JasperException: An exception occurred processing JSP page /userinfo.jsp at line 7572:?????????? <td class="content"> 73:???????????? <% 74:??????????????? String[] favorites = regUser.getFavorites();75:??????????????? for(String f:favorites)76:??????????????? {77:???????????? %>78:???????????????? <%=f%>   Stacktrace:?at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:584)?at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:481)?at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)?at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)?at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)?at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)?at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)?at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)?at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)?at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)?at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:726)?at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:469)?at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:394)?at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:311)?at servlet.RegServlet.doPost(RegServlet.java:103)?at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)?at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)?at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)?at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)?at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)?at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)?at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)?at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)?at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)?at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474)?at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)?at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)?at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)?at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)?at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)?at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)?at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)?at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:789)?at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1437)?at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)?at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)?at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)?at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)?at java.lang.Thread.run(Thread.java:745)Caused by: java.lang.NullPointerException?at org.apache.jsp.userinfo_jsp._jspService(userinfo_jsp.java:212)?at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)?at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)?at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)?... 37 more怎么解決大神們？

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已采納

言曌博客liuyanzhao_com

TA貢獻(xiàn)164條經(jīng)驗(yàn) 獲得超117個(gè)贊

上面說(shuō)了，空指針異常，一般情況下是，讓一個(gè) 為空的對(duì)象（即不存在的）調(diào)用方法。

?<%?
74:????????????????String[]?favorites?=?regUser.getFavorites();
75:????????????????for(String?f:favorites)
76:????????????????{
77:?????????????%>

不知道你上面的對(duì)象是否存在，如 regUser

1 反對(duì) 回復(fù) 2017-08-27