使用JSTL标签异常

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Java Apache Servlet JSP Web

我使用JSTL标签，如下所示：

<c:when test="${!empty flist && fn:length(flist)>3 } ">
     <c:forEach  items="${flist }" var="f" begin="${fn:length(flist)-3}" end="${fn:length(flist)}">
     <c:if test="${f.fileState!=1}">
     <tr><td width="90px;"><a href="<c:url value="/showFileIndex.do" />"><font color="blue"> [知识培训]:</a></font></td><td  align="left"><a href="<c:url value="/file/filePriview.do?filePK=${f.fileId}" />">${fnx:subStringHtml(f.fileAliaName,18,'...',false) }</td>
     <td width="60px;"><font color="blue">发布人 ：</font></td><td  align="left">${fnx:subStringHtml(f.user.userName,18,'...',false) }</td>
     <td width="80px;"><font color="blue">发布时间 ：</font></td><td  align="left"><fmt:formatDate value="${f.uploadDate }" pattern="yyyy-MM-dd" /></td>
     </tr>
     </c:if>
    </c:forEach>
    </c:when>

运行时报如下异常：

严重: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 93 in the jsp file: /WEB-INF/views/informations.jsp
The method setTest(boolean) in the type WhenTag is not applicable for the arguments (String)
90:     </c:choose>
91: 
92:     <c:choose>
93:     <c:when test="${!empty flist && fn:length(flist)>3 } ">
94:      <c:forEach  items="${flist }" var="f" begin="${fn:length(flist)-3}" end="${fn:length(flist)}">
95:      <c:if test="${f.fileState!=1}">
96:      <tr><td width="90px;"><a href="<c:url value="/showFileIndex.do" />"><font color="blue"> [abcdefghijk]:</a></font></td><td  align="left"><a href="<c:url value="/file/filePriview.do?filePK=${f.fileId}" />">${fnx:subStringHtml(f.fileAliaName,18,'...',false) }</td>


Stacktrace:
	at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
	at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
	at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:439)
	at org.apache.jasper.compiler.Compiler.compile(Compiler.java:334)
	at org.apache.jasper.compiler.Compiler.compile(Compiler.java:312)
	at org.apache.jasper.compiler.Compiler.compile(Compiler.java:299)
	at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
	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.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
	at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:230)
	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1060)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:798)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:552)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	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.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
	at org.apache.taglibs.standard.tag.common.core.ImportSupport.acquireString(ImportSupport.java:314)
	at org.apache.taglibs.standard.tag.common.core.ImportSupport.doEndTag(ImportSupport.java:171)
	at org.apache.jsp.decorators.main_jsp._jspx_meth_c_005fimport_005f1(main_jsp.java:1030)
	at org.apache.jsp.decorators.main_jsp._jspx_meth_c_005fif_005f2(main_jsp.java:1000)
	at org.apache.jsp.decorators.main_jsp._jspService(main_jsp.java:377)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
	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.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
	at com.opensymphony.module.sitemesh.filter.PageFilter.writeDecorator(PageFilter.java:173)
	at com.opensymphony.module.sitemesh.filter.PageFilter.applyDecorator(PageFilter.java:158)
	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:62)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176)
	at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
	at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
	at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:381)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	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:76)
	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:128)
	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:293)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
	at java.lang.Thread.run(Unknown Source)

它说是when那里出现异常，开始以为是业务逻辑的错，后来才知道原来是自己在写when标签里的test的最后一个引号和大括号之间多了一个空格，就这么一个小点导致了异常，所以写程序还是要心细一点。解决方案如下:

<c:when test="${!empty flist && fn:length(flist)>3 }">

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2011-01-02 09:48
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