dwr 的session错误

<!--dwr config--><servlet>    <servlet-name>dwr-invoker</servlet-name>    <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>    <init-param>      <param-name>debug</param-name>      <param-value>true</param-value>    </init-param>    <init-param>      <param-name>activeReverseAjaxEnabled</param-name>      <param-value>true</param-value>    </init-param>    <init-param>      <param-name>initApplicationScopeCreatorsAtStartup</param-name>      <param-value>true</param-value>    </init-param>    <init-param>      <param-name>maxWaitAfterWrite</param-name>      <param-value>100</param-value>    </init-param>    <init-param>    <param-name>crossDomainSessionSecurity</param-name>    <param-value>false</param-value>    </init-param>    <load-on-startup>-1</load-on-startup>   </servlet>    <servlet-mapping>      <servlet-name>dwr-invoker</servlet-name>      <url-pattern>/dwr/*</url-pattern>    </servlet-mapping><!--dwr end -->