freemarker中循环map根据key值得value 报错

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freemarker中循环map根据key值得value 报错5

[#list uMap?keys as key]
     <select>
         <option value="${key}">${uMap[key]}</option>
      </select>
[/#list]

Map<Integer, String> uMap = new HashMap<Integer, String>();
uMap.put(1,"zhangsan");
uMap.put(2,"lisi");
model.addAttribute("uMap", uMap);

严重: Servlet.service() for servlet springMVC threw exception
FreeMarker template error:
For "...[...]" left-hand operand: Expected a sequence or string (or something that's implicitly convertible to string), but this evaluated to an extended_hash (wrapper: f.t.SimpleHash):
==> uMap  [in template "test.ftl" at line 50, column 58]

The failing instruction (FTL stack trace):
----------
==> ${uMap[key]}  [in template "test.ftl" at line 50, column 56]
    #list uMap?keys as key  [in template "test.ftl" at line 48, column 25]
----------

Java stack trace (for programmers):
----------
freemarker.core.UnexpectedTypeException: [... Exception message was already printed; see it above ...]
	at freemarker.core.DynamicKeyName.dealWithNumericalKey(DynamicKeyName.java:141)
	at freemarker.core.DynamicKeyName._eval(DynamicKeyName.java:104)
	at freemarker.core.Expression.eval(Expression.java:111)
	at freemarker.core.Expression.evalAndCoerceToString(Expression.java:115)
	at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.MixedContent.accept(MixedContent.java:93)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:181)
	at freemarker.core.Environment.visitIteratorBlock(Environment.java:509)
	at freemarker.core.IteratorBlock.accept(IteratorBlock.java:103)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.MixedContent.accept(MixedContent.java:93)
	at freemarker.core.Environment.visit(Environment.java:265)
	at freemarker.core.Environment.process(Environment.java:243)
	at freemarker.template.Template.process(Template.java:277)
	at org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:366)
	at org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:283)
	at org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:233)
	at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:167)
	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:264)
	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1208)
	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:992)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:939)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:152)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Thread.java:619)

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