java.lang.NoSuchMethodException：java.lang.String.substring（java.lang.Long，java.lang.Long）

Question

我有一個jsp代碼在其中一臺機器上正常工作。但是，當我複製到另一臺機器，我得到這個沒有這種方法發現異常。我對春天很陌生。有人能解釋我錯過了什麼。

以下是代碼是導致異常的線路：

<c:set var="rawDate" value="${result.getDate()}"/> 
<c:set var="rawTime" value="${result.getTime()}"/> 
<td id="formattedDate" class="center"><c:out value="${rawDate.substring(4,6)}"/>/<c:out value="${rawDate.substring(6,8)}"/></td> 
<td id="formattedTime" class="center"><c:out value="${result.getTime().substring(0,2)}"/>:<c:out value="${result.getTime().substring(2,4)}"/></td> 

這裏是堆棧跟蹤

May 9, 2012 9:35:56 AM org.apache.catalina.core.ApplicationDispatcher invoke 
SEVERE: Servlet.service() for servlet jsp threw exception 
(,) 
    at java.lang.Class.getMethod(Class.java:1605) 
    at javax.el.BeanELResolver.invoke(BeanELResolver.java:405) 
    at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:147) 
    at org.apache.el.parser.AstValue.getValue(AstValue.java:159) 
    at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189) 
    at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:989) 
    at org.apache.jsp.WEB_002dINF.jsp.tables.WatchAllTable_jsp._jspx_meth_c_005fout_005f8(WatchAllTable_jsp.java:1132) 
    at org.apache.jsp.WEB_002dINF.jsp.tables.WatchAllTable_jsp._jspx_meth_c_005fforEach_005f0(WatchAllTable_jsp.java:412) 
    at org.apache.jsp.WEB_002dINF.jsp.tables.WatchAllTable_jsp._jspService(WatchAllTable_jsp.java:127) 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:417) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:306) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672) 
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463) 
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402) 
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329) 
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238) 
    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262) 
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1180) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) 
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:306) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:550) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:380) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243) 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188) 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:288) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    at java.lang.Thread.run(Thread.java:662) 
org.apache.catalina.core.StandardWrapperValve invoke 
SEVERE: Servlet.service() for servlet [spring] in context with path [/watch] threw  exception [An exception occurred processing JSP page /WEB-INF/jsp/tables/WatchAllTable.jsp at  line 77 

74:      <c:set var="rawDate" value="${result.getDate()}"/> 
75:      <c:set var="rawTime" value="${result.getTime()}"/> 
76:       
77:      <td id="formattedDate" class="center"><c:out value="${rawDate.substring(4,6)}"/>/<c:out value="${rawDate.substring(6,8)}"/></td> 
78:      <td id="formattedTime" class="center"><c:out value="${result.getTime().substring(0,2)}"/>:<c:out value="${result.getTime().substring(2,4)}"/></td> 
79:      <td id="documentGroup" class="hidden"><c:out value="${curDocGroup}"/> </td> 

下面是它看起來像解決這個問題的鏈接，但我不明白什麼他們在說 。

http://forum.springsource.org/showthread.php?108175-SpEL-does-not-recognize-functions&s=e077b42fd45ae3a3177a01c90339893c

感謝

Answer 1

EL（表達式語言，那些東西${}）將把數字視爲long而real method預計只有int數字。這解釋了這個例外。

你需要JSTLfn:substring()代替，

<%@taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> 
... 
<c:set var="rawDate" value="${result.date}"/> 
<c:set var="rawTime" value="${result.time}"/> 
<c:out value="${fn:substring(rawDate,4,6)}"/>/<c:out value="${fn:substring(rawDate,6,8)}"/> 
<c:out value="${fn:substring(rawtime,0,2)}"/>:<c:out value="${fn:substring(rawtime,2,4)}"/> 

或更好的，只是使用合適的工具直接，其存儲爲java.util.Date的模型，並用JSTL<fmt:formatDate>。

<%@taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %> 
... 
<fmt:formatDate value="${result.realJavaUtilDate}" pattern="MM/dd HH:mm" /> 

對其保存的數據使用正確的數據類型。

Answer 2

你也可以做以下事情。

<c:set var="rawDate" value="${result.getDate()}"/> 
    <c:set var="rawTime" value="${result.getTime()}"/> 
    <td id="formattedDate" class="center"><c:out value="${rawDate.substring(Integer.parseInt(\"4\"), Integer.parseInt(\"6\")}"/>/<c:out value="${rawDate.substring(Integer.parseInt(\"6\"), Integer.parseInt(\"8\")}"/></td> 
    <td id="formattedTime" class="center"><c:out value="${result.getTime().substring(Integer.parseInt(\"0\"), Integer.parseInt(\"2\")}"/>:<c:out value="${result.getTime().substring(Integer.parseInt(\"2\"), Integer.parseInt(\"4\")}"/></td