Grails Servlet过滤器疯狂：... ServletRequestAttributes不能被转换为..GrailsWebRequest

Question

我有一个Grails后端，带有充当UI的Flex单页应用程序。出于某种原因，当我提出AMF请求时，我的应用程序就会出现。用下面的错误（部分截断可读性）

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 

我读过一些其他的解决方案在网络上，他们说我必须先订购我的web.xml我springSecurityFilter和它的最后一个映射。我已经做到了，并且下面是我的web.xml模板（Grails的得到它的阿霍德之前）

<?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> 

被访问时/胡说/ messagebroker/AMF，所以我将有网址认为只有blazeds的messagebroker处理程序才会知晓请求，但显然我错了。

对此非常感谢。

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。

我在猜测，但charEncodingFilter创建的ServletRequestAttribute实例在执行sitemesh过滤器时被转换为错误类型。

您是否尝试过交换filter-mapping的位置？例如：

<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>