Grails1.3.3过滤器-NullPointerException或ClassCastException

我目前要问的问题如下:web.xml包含:

<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>
</filter-mapping>

Caused by: 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.pages.GroovyPagesServlet.createResponseWriter(GroovyPagesServlet.java:211)
    at org.codehaus.groovy.grails.web.pages.GroovyPagesServlet.renderPageWithEngine(GroovyPagesServlet.java:137)
    at org.codehaus.groovy.grails.web.pages.GroovyPagesServlet.doService(GroovyPagesServlet.java:122)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)

如果我去掉弹簧过滤器,我会得到一个 NullPointerException :

java.lang.NullPointerException
    at org.codehaus.groovy.grails.web.mapping.filter.UrlMappingsFilter.doFilterInternal(UrlMappingsFilter.java:136)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.codehaus.groovy.grails.web.sitemesh.GrailsPageFilter.obtainContent(GrailsPageFilter.java:245)
    at org.codehaus.groovy.grails.web.sitemesh.GrailsPageFilter.doFilter(GrailsPageFilter.java:134)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

乍一看,我猜没有人在设定 org.codehaus.groovy.grails.WEB_REQUEST 请求属性 UrlMappingsFilter 正在期待(导致NPE)

SpringServlet(在映射spring过滤器之后,似乎没有被映射)添加了“错误的”(根据grails) ServletRequestAttributes

对上面的映射进行重新排序,使其看起来好像spring映射不存在一样,即抛出一个NPE。

(我有必要的)

<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>

<!-- The Groovy Server Pages 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>