使用spring表达式语言评估2d数组中的单元格

时间：2014-02-14 19:18:19

标签： java spring jsp jstl el

在spring mvc应用程序中，我有一个jsp需要遍历两个共享相同索引i的集合。 blocks列表包含时间值。 filledblocks数组是一个二维数组，每行中的第一个元素是块索引i。对于i的每个值，jsp需要检查行中第二个元素的值，并根据第二个元素值是否为0来确定要发送给用户的输出。

以下是触发错误的代码行：

<spring:eval expression="filledblocks[i][1]!=0" var="appointment" />

以下是抛出的异常：

org.springframework.core.convert.ConverterNotFoundException:  
No converter found capable of converting from type  
javax.servlet.jsp.jstl.core.LoopTagSupport$1Status  
to type java.lang.Integer

以下是上面一行所在的jsp代码：

            <table>
                <thead>
                    <tr>
                        <th>Time Slots</th>
                        <th>Appointments</th>
                    </tr>
                </thead>    
                <c:forEach var="block" items="${calendar.blocks}" varStatus="i">
                    <spring:eval expression="calendar.getBlockMillis(block)" var="dateTime"/>
                    <tr class="${i.index % 2 == 0 ? 'even' : ''}">
                        <td width="100px" class="block">
                            <joda:format value="${block}" style="-S" />
                        </td>
                            <spring:eval expression="filledblocks[i][1]!=0" var="appointment" />
                        <c:choose>
                            <c:when test="${appointment == true}">
                                    <td class="filled" data-dateTime="<c:out value="${dateTime}" />" >
                                        <a href="${testLink}" style="display:block;">&nbsp;There is an appointment.</a>
                                    <c:url var="testLink" value="/">
                                        <c:param name="somevarname" value="test" />
                                    </c:url>
                                    </td>
                           </c:when>
                           <c:otherwise>
                               <c:url var="testLink" value="/">
                                   <c:param name="somevarname" value="test" />
                               </c:url>
                               <td class="open" data-dateTime="<c:out value="${dateTime}" />" >
                                   <a href="${testLink}" style="display:block;">No Appointment</a>
                               </td>
                           </c:otherwise>
                        </c:choose>
                    </tr>
                </c:forEach>
            </table>

这是完整的堆栈跟踪：

Feb 14, 2014 10:49:50 AM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type javax.servlet.jsp.jstl.core.LoopTagSupport$1Status to type java.lang.Integer
    at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:276)
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:172)
    at org.springframework.expression.spel.support.StandardTypeConverter.convertValue(StandardTypeConverter.java:66)
    at org.springframework.expression.spel.ExpressionState.convertValue(ExpressionState.java:142)
    at org.springframework.expression.spel.ast.Indexer.getValueRef(Indexer.java:418)
    at org.springframework.expression.spel.ast.Indexer.getValueInternal(Indexer.java:78)
    at org.springframework.expression.spel.ast.CompoundExpression.getValueRef(CompoundExpression.java:55)
    at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:82)
    at org.springframework.expression.spel.ast.OpNE.getValueInternal(OpNE.java:37)
    at org.springframework.expression.spel.ast.OpNE.getValueInternal(OpNE.java:29)
    at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:93)
    at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:89)
    at org.springframework.web.servlet.tags.EvalTag.doEndTag(EvalTag.java:121)
    at org.apache.jsp.WEB_002dINF.jsp.appointments.calendar_jsp._jspx_meth_spring_005feval_005f2(calendar_jsp.java:652)
    at org.apache.jsp.WEB_002dINF.jsp.appointments.calendar_jsp._jspx_meth_c_005fforEach_005f0(calendar_jsp.java:557)
    at org.apache.jsp.WEB_002dINF.jsp.appointments.calendar_jsp._jspService(calendar_jsp.java:176)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:263)
    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:621)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at com.github.dandelion.datatables.core.web.filter.DatatablesFilter.doFilter(DatatablesFilter.java:73)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at com.github.dandelion.datatables.extras.servlet2.filter.DatatablesFilter.doFilter(DatatablesFilter.java:71)
    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:107)
    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:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
Feb 14, 2014 10:49:50 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [KnowledgeManager] in context with path [/KnowledgeManager] threw exception [org.springframework.expression.spel.SpelEvaluationException: EL1001E:(pos 12): Type conversion problem, cannot convert from javax.servlet.jsp.jstl.core.LoopTagSupport$1Status to java.lang.Integer] with root cause
org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type javax.servlet.jsp.jstl.core.LoopTagSupport$1Status to type java.lang.Integer
    at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:276)
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:172)
    at org.springframework.expression.spel.support.StandardTypeConverter.convertValue(StandardTypeConverter.java:66)
    at org.springframework.expression.spel.ExpressionState.convertValue(ExpressionState.java:142)
    at org.springframework.expression.spel.ast.Indexer.getValueRef(Indexer.java:418)
    at org.springframework.expression.spel.ast.Indexer.getValueInternal(Indexer.java:78)
    at org.springframework.expression.spel.ast.CompoundExpression.getValueRef(CompoundExpression.java:55)
    at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:82)
    at org.springframework.expression.spel.ast.OpNE.getValueInternal(OpNE.java:37)
    at org.springframework.expression.spel.ast.OpNE.getValueInternal(OpNE.java:29)
    at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:93)
    at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:89)
    at org.springframework.web.servlet.tags.EvalTag.doEndTag(EvalTag.java:121)
    at org.apache.jsp.WEB_002dINF.jsp.appointments.calendar_jsp._jspx_meth_spring_005feval_005f2(calendar_jsp.java:652)
    at org.apache.jsp.WEB_002dINF.jsp.appointments.calendar_jsp._jspx_meth_c_005fforEach_005f0(calendar_jsp.java:557)
    at org.apache.jsp.WEB_002dINF.jsp.appointments.calendar_jsp._jspService(calendar_jsp.java:176)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:263)
    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:621)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at com.github.dandelion.datatables.core.web.filter.DatatablesFilter.doFilter(DatatablesFilter.java:73)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at com.github.dandelion.datatables.extras.servlet2.filter.DatatablesFilter.doFilter(DatatablesFilter.java:71)
    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:107)
    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:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)

1 个答案:

答案 0 :(得分：1)

正如错误所说，你正在尝试一个时髦的类演员，这是行不通的。请改用：

<spring:eval expression="filledblocks[i.index][1]!=0" var="appointment" />
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