jeecms2012版设置freemarkerViewResolver的sexposeRequestAttributes为true后出错

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1# 发表于:2012-07-14 12:39:49 IP:116.249.*.*

为了在模板中获取url参数，修改了配置文件jeecms-servlet-front.xml如下
<bean id="freemarkerViewResolver" class="com.jeecms.common.web.springmvc.SimpleFreeMarkerViewResolver">
<property name="contentType" value="text/html; charset=UTF-8"/>
<property name="exposeRequestAttributes" value="true"/> 注：原为false
<property name="exposeSessionAttributes" value="false"/>
<property name="exposeSpringMacroHelpers" value="true"/>
</bean>

页面提示如下错误：
2012-7-13 18:32:57 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet [JeeCmsFront] in context with path [/] threw exception [Cannot expose request attribute '_start_time' because of an existing model object of the same name] with root cause
javax.servlet.ServletException: Cannot expose request attribute '_start_time' because of an existing model object of the same name
at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:123)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.jeecms.common.web.ProcessTimeFilter.doFilter(ProcessTimeFilter.java:44)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1805)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

查了下_start_time，原来是ProcessTimeFilter中为了[@process_time/]标签计算执行时间在request中增加了_start_time属性，这很正常，但是为什么会报错呢？应该是什么地方重复向request中写入了_start_time属性，望尽快解决，谢谢。

暂时用不上[@process_time/]标签，干脆将ProcessTimeFilter.java中的下面一句给注释掉了
request.setAttribute(START_TIME, time);
心想这下不会报错了，总可以获取到url参数了吧，结果还是获取不到，到底怎么回事？
使用的url地址是http://localhost:8080/?myid=1（首页地址后面加了个参数，想在模板中使用这个参数），模板中使用了如下的各种写法：
${myid}
${request.myid}
${request["myid"]}
${requestParameters.myid}
${requestParameters["myid"]
……