JSP包含不調用servlet的

在我的jsp頁面將jsp：include數（1）不叫servlet..I在cat_catalogo.Is一個空指針異常兩天，我試着理解這個問題。這是我的jsp page..If我刪除JSP結構：包括（1）和列表，它的工作原理，但如果我取消一切，只jsp:include(1)和清單留下，它的工作原理也。我很絕望。感謝所有想幫助我的人。JSP包含不調用servlet的

1)<jsp:include page="CercaCategorieServlet" flush="true"/> 

<div class="contenitore"> 

<div class="siderbarSx"> 
... 
while(iter.hasNext()) 

<% 
    List<String> cat_catalogo=(List<String>)request.getAttribute("lista_categorie"); 
    %> 
    <form method="post" action="CercaArticoloServlet">...</form> 
    //end of while 
</div>//end of sidebarSx 

<div class="contenutoprincipale"> 

<jsp:include page="ContaRecensioniServlet" flush="true"> 
<jsp:param name="id_articolo" value="<%=a.getId()%>" /> 
</jsp:include> 


<form method="post" action="AggiungiArticoloAlCarrelloServlet"> 
... 
</form> 

//number 5 of this form 
<form method="post" action="CercaArticoloServlet"> 
... 
<a href="javascript:;" onclick="parentNode.submit();"></a> 
</form> 


</div>//end of contenutoprincipale 

</div>//end of contenitore

這是GlassFish的結果：

Avvertenza: Servlet.service() for servlet jsp threw exception 
java.lang.NullPointerException 
at  org.apache.jsp.VisualizzaArticoliRicerca_jsp._jspService(VisualizzaArticoliRicerca_jsp.java :90) 
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) 
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411) 
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473) 
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) 
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682) 
at org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:875) 
at  org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:739) 
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:57 5) 
at org.apache.catalina.core.ApplicationDispatcher.doDispatch(ApplicationDispatcher.java:546) 
at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:428) 
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:378) 
at store.web.CercaArticoloServlet.doPost(CercaArticoloServlet.java:46) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) 
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160) 
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734) 
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673) 
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174) 
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260) 
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188) 
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191) 
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168) 
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189) 
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119) 
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java: 288) 
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.ja va:206) 
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136) 
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114) 
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) 
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838) 
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113 ) 
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:11 5) 
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.j ava:55) 
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThre adIOStrategy.java:135) 
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:5 64) 
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544) 
at java.lang.Thread.run(Thread.java:724)

來源

2014-02-24 Alex

後在其上運行的GlassFish，你能否證實，如果你真的把屬性在'HttpServletRequest'？ –

很明顯，它從Servlet中拋出一個NullPointerException異常是調用servlet。 – developerwjk

我解決了這個問題。servlet只有doGet方法。我還添加了doPost方法，它的工作原理。request.getMethod（）首先打印「get」，然後「post」 – Alex

嘗試添加doPost method..I會建議ü上創建eclipse.It您的Web項目自動添加一個doget和dopost方法。另外，您可以將其配置爲Eclipse

來源

2014-03-15 11:23:21

JSP包含不調用servlet的

回答

相關問題