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eclipse javax.servlet.ServletException：PWC1232：超过嵌套请求调度的最大深度：20

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时间：2020-09-19 14:16:14 　来源:igfitidea点击:

javax.servlet.ServletException: PWC1232: Exceeded maximum depth for nested request dispatches: 20

eclipsejsfglassfish

提问by Rafal

I have created simple Java Dynamic Web project in Eclipse. I host my project on Glassfish 2.1.1. When I try open p1.jsfpage in browser I got following error: javax.servlet.ServletException: PWC1232: Exceeded maximum depth for nested request dispatches: 20.

我在 Eclipse 中创建了简单的 Java 动态 Web 项目。我在 Glassfish 2.1.1 上托管我的项目。当我尝试p1.jsf在浏览器中打开页面时，出现以下错误： javax.servlet.ServletException: PWC1232: Exceeded maximum depth for nested request dispatches: 20.

I have no idea how to correct this error...

我不知道如何纠正这个错误......

Here is may p1.jsfdefinition:

这是可能的p1.jsf定义：

 <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
 <%@ taglib prefix="f"  uri="http://java.sun.com/jsf/core"%>
 <%@ taglib prefix="h"  uri="http://java.sun.com/jsf/html"%>
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <title>Insert title here</title>
 </head>
 <body>
 <f:view>
  <h:outputLabel value="outputLabel"></h:outputLabel>
 </f:view>
 </body>
 </html>

My web.xml:

我的 web.xml：

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
   <display-name>web4</display-name>
   <welcome-file-list>
     <welcome-file>index.html</welcome-file>
     <welcome-file>index.htm</welcome-file>
     <welcome-file>index.jsp</welcome-file>
     <welcome-file>default.html</welcome-file>
     <welcome-file>default.htm</welcome-file>
     <welcome-file>default.jsp</welcome-file>
   </welcome-file-list>
   <servlet>
     <servlet-name>FacesServlet</servlet-name>
     <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
     <load-on-startup>1</load-on-startup>
   </servlet>
   <servlet-mapping>
     <servlet-name>FacesServlet</servlet-name>
     <url-pattern>*.jsf</url-pattern>
   </servlet-mapping>
 </web-app>

My faces-config.xml:

我的faces-config.xml：

<?xml version="1.0" encoding="UTF-8"?>

<faces-config
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd"
    version="1.2">

</faces-config>

Error details from Glassfish log:

Glassfish 日志中的错误详细信息：

PWC1406: Servlet.service() for servlet FacesServlet threw exception javax.servlet.ServletException: PWC1232: Exceeded maximum depth for nested request dispatches: 20
 org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:860)
 org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:723)
 org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:558)
 org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:490)
 org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:382)
 com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:410)
 com.sun.faces.application.ViewHandlerImpl.executePageToBuildView(ViewHandlerImpl.java:468)
 com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:140)
 com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
 com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
 com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
 javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
 org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
 org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:873)
 org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:723)
 org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:558)
 org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:490)
 org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:382)
 com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:410)
 com.sun.faces.application.ViewHandlerImpl.executePageToBuildView(ViewHandlerImpl.java:468)
 com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:140)
 com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
 com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
 com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
 javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
 org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
 org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:873)
 org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:723)
 org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:558)
 org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:490)
 org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:382)
 com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:410)
 com.sun.faces.application.ViewHandlerImpl.executePageToBuildView(ViewHandlerImpl.java:468)
 com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:140)
 com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
 com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
 com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
 javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
 org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
 org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:873)
 org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:723)
 org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:558)
 org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:490)
 org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:382)
 com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:410)
 com.sun.faces.application.ViewHandlerImpl.executePageToBuildView(ViewHandlerImpl.java:468)
 com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:140)
 com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
 com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
 com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
 javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)

回答by BalusC

  1. FacesServlet should be mapped on an url-patternof *.jsf(or anything else other than *.jsp).
  2. No javax.faces.DEFAULT_SUFFIXis needed in web.xml if you already use JSP. The JSP page itself must actually be named pagename.jsp(and thus notpagename.jsf, this is the root cause of the recursive forward calls).
  3. Open the page in the webbrowser using the *.jsfsuffix: http://example.com/context/pagename.jsf(and thus notby pagename.jsp, else you would get RuntimeException: FacesContext not found).
  1. FacesServlet 应该映射到url-patternof *.jsf（或除 之外的任何其他东西*.jsp）。
  2. 没有javax.faces.DEFAULT_SUFFIX需要在web.xml中，如果你已经使用JSP。JSP 页面本身实际上必须被命名pagename.jsp（因此不是pagename.jsf，这是递归前向调用的根本原因）。
  3. 使用*.jsf后缀在网络浏览器中打开页面：（http://example.com/context/pagename.jsf因此不是by pagename.jsp，否则你会得到RuntimeException: FacesContext not found）。

回答by Bozho

This means that recursive internal forwards occur. A few things to observe:

这意味着递归内部转发发生。需要注意的几点：

  • make sure you are accessing the page via the right suffix. i.e. http://localhost:8080/app/p1.jsp, and not p1.page- you have mapped the jsf suffix to be .jsp
  • check your navigation rules in your faces-config.xml

  • make sure you have the following context-param defined:

    <context-param>
    <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
    <param-value>.jsp</param-value>
</context-param>
  • 确保您通过正确的后缀访问该页面。即http://localhost:8080/app/p1.jsp，而不是p1.page- 您已将 jsf 后缀映射为.jsp
  • 检查你的 faces-config.xml 中的导航规则

  • 确保您定义了以下上下文参数：

    <context-param>
    <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
    <param-value>.jsp</param-value>
</context-param>

To summarize - the javax.faces.DEFAULT_SUFFIXdetermines the file extension under which the page are sought, and the <url-pattern>of the faces-servlet determines the way the jsf pages are accessed by clients (browsers)

总而言之 -javax.faces.DEFAULT_SUFFIX确定了寻找页面的文件扩展名，<url-pattern>faces-servlet 确定了客户端（浏览器）访问 jsf 页面的方式

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