用MyEclipse做了一個app，在其自帶的Tomcat里運行正常，做成war后卻出現如下錯誤：

[ServletException in:/page/jsp/template/block.jsp] org.apache.jsp.page.jsp.template.block_jsp' java.lang.ClassNotFoundException: org.apache.jsp.page.jsp.template.block_jsp at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:132) at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:63) at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:143) at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:172) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:605) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:544) at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:954) at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:652) at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:138) at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:152) at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:138) at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:756) at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:881) at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:473) at org.apache.jsp.page.jsp.user.login.index_jsp._jspx_meth_tiles_005finsert_005f0(index_jsp.java:132) at org.apache.jsp.page.jsp.user.login.index_jsp._jspService(index_jsp.java:77) 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.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: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:312) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)?

以上錯誤密密麻麻的，讓人心驚，仔細一看吧，還看不出頭緒。心一急就有點亂投醫的意思了，發帖，網上搜，沒找到對癥的。

后來想想，是不是用了STURTS的TILES的問題，找了個基本是固定信息的近靜態頁面，問題還是差不多。

覺得奇怪，打開一看，靜態頁面里除了一句<%@?taglib?prefix="c"?uri="http://java.sun.com/jsp/jstl/core"%>就沒有其它非HTML代碼了，難道這句話在作怪。

于是，用VI刪掉這句話，再輸入靜態網頁URL，正常顯示了！！

再找了/page/jsp/template/block.jsp，也刪掉這句話，它也正常了。這證明STURTS的TILES沒有問題。

本地一查，大約四分之一的頁面都有<%@?taglib?prefix="c"?uri="http://java.sun.com/jsp/jstl/core"%>這句話，但實際上我是沒有用JSTL的，頁面除了HTML就是JS。于是全刪掉。

再運行，所有頁面都正常了。這證明MyEclipse的導出war包也是可以信賴的。

究其原因，這四分之一的頁面估計都是一個母本，這個母本又是用MyEclipse生成的，生成時就帶了<%@?taglib?prefix="c"?uri="http://java.sun.com/jsp/jstl/core"%>這句話。首頁又在這四分之一里面，出的錯又沒點中要害，所以一開始讓人丈二和尚摸不著頭腦。后來從靜態頁面測試起是走在正道上了，在瀏覽器的地址欄輸入jsp地址，先從最簡頁面開始，逐漸測試復雜的頁面，最后查清確認了真相。

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轉載于:https://www.cnblogs.com/xiandedanteng/p/3329888.html

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