Struts2版本更新报错：>>> ActionContextCleanUp <<< is deprecated! Please use the new filters!

因低版本Struts2存在漏洞，更新为较新的版本。启动时，报如下警告信息：

***************************************************************************
*                                 WARNING!!!                              *
*                                                                         *
* >>> ActionContextCleanUp <<< is deprecated! Please use the new filters! *
*                                                                         *
*             This can be a source of unpredictable problems!             *
*                                                                         *
*                Please refer to the docs for more details!               *
*              http://struts.apache.org/2.x/docs/webxml.html              *
*                                                                         *
***************************************************************************

自2.1.3版本开始，ActionContextCleanUp和FilterDispatcher都由StrutsPrepareAndExecuteFilter代替，配置如下：

注释掉

    <filter>
        <filter-name>struts2CleanupFilter</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2CleanupFilter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>

和

<filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>

<filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>*.nt</url-pattern>
    <dispatcher>REQUEST</dispatcher> 
    <dispatcher>FORWARD</dispatcher> 
    <dispatcher>INCLUDE</dispatcher>  
</filter-mapping>

改为：

    <filter>
        <filter-name>struts2Filter</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2Filter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>

另外，如果要使用sitemesh，要按照strutsPrepareFilter -> sitemesh -> strutsExecuteFilter的顺序配置过滤器，将sitemesh配置在中间，如下：

<filter>
    <filter-name>strutsPrepareFilter</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareFilter</filter-class>
</filter>
<filter>
    <filter-name>sitemesh</filter-name>
    <filter-class>com.opensymphony.module.sitemesh.filter.PageFilter</filter-class>
</filter>
<filter>
    <filter-name>strutsExecuteFilter</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsExecuteFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>strutsPrepareFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
    <filter-name>sitemesh</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
    <filter-name>strutsExecuteFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>