FreeMark 中使用<ww:action/>标签出现FreeMarker template error!

请教谁知道这个问题是怎么回事?FreeMark中使用<ww:action/>标签

test.html
<#assign ww=JspTaglibs["/WEB-INF/webwork.tld"] />
<@ww.action id="product" name="displayProduct" namespace="/product" executeResult="false" />
<html>
  <head>
    <title>test!!!</title>
  </head>
  <body>
  </body>
</html>
java.lang.IllegalArgumentException: argument type mismatch
The problematic instruction:
----------
==> user-directive ww.action [on line 3, column 1 in com/enation/groupware/product/web/page/ProductIndex.html]
----------

Java backtrace for programmers:
----------
freemarker.template.TemplateModelException: java.lang.IllegalArgumentException: argument type mismatch
	at freemarker.ext.jsp.TagTransformModel.getWriter(TagTransformModel.java:166)
	at freemarker.core.Environment.visit(Environment.java:220)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:116)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:196)
	at freemarker.core.Environment.process(Environment.java:176)
	at freemarker.template.Template.process(Template.java:231)
	at com.opensymphony.webwork.views.freemarker.FreemarkerResult.doExecute(FreemarkerResult.java:153)
	at com.opensymphony.webwork.dispatcher.WebWorkResultSupport.execute(WebWorkResultSupport.java:143)
	at com.opensymphony.xwork.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:311)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:206)
	at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:168)
	at com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.xwork.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:115)
	at com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.webwork.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:171)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.webwork.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:147)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.xwork.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:151)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.xwork.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:186)
	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
	at com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:113)
	at com.opensymphony.webwork.dispatcher.DispatcherUtils.serviceAction(DispatcherUtils.java:225)
	at com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:111)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
	at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.IllegalArgumentException: argument type mismatch
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at freemarker.ext.jsp.TagTransformModel.setupTag(TagTransformModel.java:203)
	at freemarker.ext.jsp.TagTransformModel.getWriter(TagTransformModel.java:137)
	... 57 more
[color=red][/color]

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