servlets - Grails Servlet 过滤器疯狂 : . ..ServletRequestAttributes 无法转换为 ..GrailsWebRequest

Question

我有一个 Grails 后端，其中一个 Flex 单页应用程序充当 UI。由于某种原因，当我发出 AMF 请求时，我的应用程序出现问题。出现以下错误(为了便于阅读，部分内容被截断)

2014-04-20 21:07:55,572 [http-bio-8080-exec-6] ERROR errors.GrailsExceptionResolver  -      
ClassCastException occurred when processing request: [POST]   
/OrlandoGrails/messagebroker/amf
org.springframework.web.context.request.ServletRequestAttributes cannot be cast to 
org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest. Stacktrace follows:
java.lang.ClassCastException:   
org.springframework.web.context.request.ServletRequestAttributes cannot be cast to 
 org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest...
2014-04-20 21:07:55,573 [http-bio-8080-exec-6] ERROR errors.GrailsExceptionResolver  - 

Unable to render errors view: 
org.springframework.web.context.request.ServletRequestAttributes cannot be cast to 
org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest...
java.lang.ClassCastException: 
org.springframework.web.context.request.ServletRequestAttributes cannot be cast to 
org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest
Servlet.service() for servlet [Spring MVC Dispatcher Servlet] in context with path 
[/OrlandoGrails] threw exception [Request processing failed; nested exception is 
org.codehaus.groovy.grails.exceptions.GrailsRuntimeException: 

java.lang.ClassCastException: 
org.springframework.web.context.request.ServletRequestAttributes cannot be cast to 
org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest] with root cause...
java.lang.ClassCastException: 
org.springframework.web.context.request.ServletRequestAttributes cannot be cast to 
org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest at 
 grails.plugin.springsecurity.web.filter.GrailsAnonymousAuthenticationFilter.doFilter(GrailsAnonymousAuthenticationFilter.java:53

我已经阅读了网络上的一些其他解决方案，他们说我必须首先使用 springSecurityFilter 订购 web.xml，最后进行映射。我已经这样做了，下面是我的 web.xml 模板(在 Grails 掌握它之前)

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
     metadata-complete="true"
     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-app_3_0.xsd">

<display-name>/@grails.project.key@</display-name>

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>

<context-param>
    <param-name>webAppRootKey</param-name>
    <param-value>@grails.project.key@</param-value>
</context-param>

<listener>
    <listener-class>org.codehaus.groovy.grails.web.context.GrailsContextLoaderListener</listener-class>
</listener>

<filter>
    <filter-name>sitemesh</filter-name>
    <filter-class>org.codehaus.groovy.grails.web.sitemesh.GrailsPageFilter</filter-class>
</filter>
<filter>
    <filter-name>charEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    <init-param>
        <param-name>targetBeanName</param-name>
        <param-value>characterEncodingFilter</param-value>
    </init-param>
    <init-param>
        <param-name>targetFilterLifecycle</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>

<filter-mapping>
    <filter-name>charEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
    <filter-name>sitemesh</filter-name>
    <url-pattern>/*</url-pattern>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>ERROR</dispatcher>
</filter-mapping>


<servlet>
    <servlet-name>grails</servlet-name>
    <servlet-class>org.codehaus.groovy.grails.web.servlet.GrailsDispatcherServlet</servlet-class>
    <init-param>
        <param-name>dispatchOptionsRequest</param-name>
        <param-value>true</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <async-supported>true</async-supported>
</servlet>
<servlet>
    <servlet-name>gsp</servlet-name>
    <servlet-class>org.codehaus.groovy.grails.web.pages.GroovyPagesServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>gsp</servlet-name>
    <url-pattern>*.gsp</url-pattern>
</servlet-mapping>

<session-config>
    <session-timeout>30</session-timeout>
</session-config>

<welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>index.gsp</welcome-file>
</welcome-file-list>

<listener>
    <listener-class>flex.messaging.HttpFlexSession</listener-class>
</listener>
<servlet>
    <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/config/web-application-config.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
    <url-pattern>/messagebroker/*</url-pattern>
</servlet-mapping>

正在访问的 URL 是/blah/messagebroker/amf，所以我本以为只有 blazeds messagebroker 处理程序才能收到请求，但显然我错了。

非常感谢对此的任何帮助。

Answer 1

由于 web.xml 中的文档排序，charEncodingFilter 将始终在 sitemesh 过滤器之前执行。

我正在推测，但当 sitemesh 过滤器时，由 charEncodingFilter 创建的 ServletRequestAttribute 实例似乎被转换为错误的类型被执行。

您是否尝试过交换过滤器映射的位置？像这样的东西:

<filter-mapping>
    <filter-name>sitemesh</filter-name>
    <url-pattern>/*</url-pattern>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>ERROR</dispatcher>
</filter-mapping>
<filter-mapping>
    <filter-name>charEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>