the correct order of filters in web.xml for a grails application

问题

the web.xml of my groovy application has some filters, filtermappings, servlet mappings, listeners defined in the following exact order:

<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4">
    <display-name>/gra-production-0.1</display-name>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml
                     /WEB-INF/security-app-context.xml
                </param-value>
    </context-param>
    <context-param>
        <param-name>webAppRootKey</param-name>
        <param-value>myapp-production-0.1</param-value>
    </context-param>

    <filter>
        <filter-name>sitemesh</filter-name>
        <filter-class>org.codehaus.groovy.grails.web.sitemesh.GrailsPageFilter</filter-class>
    </filter>

    <filter>
        <filter-name>urlMapping</filter-name>
        <filter-class>org.codehaus.groovy.grails.web.mapping.filter.UrlMappingsFilter</filter-class>
    </filter>
    <filter>
        <filter-name>hiddenHttpMethod</filter-name>
        <filter-class>org.codehaus.groovy.grails.web.filters.HiddenHttpMethodFilter</filter-class>
    </filter>
    <filter>
        <filter-name>grailsWebRequest</filter-name>
        <filter-class>org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequestFilter</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>
            <filter-name>springSecurityFilterChain</filter-name>
            <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    </filter>
    <filter-mapping>
            <filter-name>springSecurityFilterChain</filter-name>
            <url-pattern>/*</url-pattern>
            <dispatcher>ERROR</dispatcher>
            <dispatcher>FORWARD</dispatcher>
            <dispatcher>REQUEST</dispatcher>
    </filter-mapping>
    </filter-mapping>
    <filter-mapping>
        <filter-name>charEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>hiddenHttpMethod</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>FORWARD</dispatcher>
        <dispatcher>REQUEST</dispatcher>
    </filter-mapping>
    <filter-mapping>
        <filter-name>grailsWebRequest</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>FORWARD</dispatcher>
        <dispatcher>REQUEST</dispatcher>
    </filter-mapping>
    <filter-mapping>
        <filter-name>sitemesh</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>urlMapping</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>FORWARD</dispatcher>
        <dispatcher>REQUEST</dispatcher>
    </filter-mapping>
    <listener>
        <listener-class>org.codehaus.groovy.grails.web.util.Log4jConfigListener</listener-class>
    </listener>
    <listener>
        <listener-class>org.codehaus.groovy.grails.web.context.GrailsContextLoaderListener</listener-class>
    </listener>
    <servlet>
        <servlet-name>grails</servlet-name>
        <servlet-class>org.codehaus.groovy.grails.web.servlet.GrailsDispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet>
        <servlet-name>gsp</servlet-name>
        <servlet-class>org.codehaus.groovy.grails.web.pages.GroovyPagesServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>grails-errorhandler</servlet-name>
        <servlet-class>org.codehaus.groovy.grails.web.servlet.ErrorHandlingServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>gsp</servlet-name>
        <url-pattern>*.gsp</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>grails-errorhandler</servlet-name>
        <url-pattern>/grails-errorhandler</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>grails</servlet-name>
        <url-pattern>*.dispatch</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>120</session-timeout>
    </session-config>
    <listener>
        <listener-class>
            org.springframework.web.context.request.RequestContextListener
        </listener-class>
      </listener>

</web-app>

Right now the server starts up fine but when I hit my application URL I get a grails runtime exception as follows:

java.lang.ClassCastException: org.springframework.web.context.request.ServletRequestAttributes cannot be cast to org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest

    at org.codehaus.groovy.grails.web.util.WebUtils.retrieveGrailsWebRequest(WebUtils.java:497)

I think its an issue with the order of loading of filters and filter mappings..not sure what the correct order should be?

回答1:

Try upgrading to v1.2.5 of the plugin. It correctly orders filter-mapping elements (there was an issue with the resources plugin which also has strict element ordering rules).

One thing that looks weird is there are two </filter-mapping> end tags after the 'springSecurityFilterChain' filter-mapping. Is this file edited?

来源：https://stackoverflow.com/questions/8146498/the-correct-order-of-filters-in-web-xml-for-a-grails-application