org.apache.jasper.JasperException: The absolute uri: [http://java.sun.com/jsp/jstl/core] cannot be r

项目启动报错

1.报错内容：

报错先是这样

按照百度的方法添加了c.tld和对应的web.xml文件

Sep 13, 2022 11:25:35 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [] threw exception [The absolute uri: [http://java.sun.com/jsp/jstl/core] cannot be resolved in either web.xml or the jar files deployed with this application] with root cause
org.apache.jasper.JasperException: The absolute uri: [http://java.sun.com/jsp/jstl/core] cannot be resolved in either web.xml or the jar files deployed with this applicationat org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:56)at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:472)at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:121)at org.apache.jasper.compiler.TagLibraryInfoImpl.generateTLDLocation(TagLibraryInfoImpl.java:325)at org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:154)at org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:419)at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:484)at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1421)at org.apache.jasper.compiler.Parser.parse(Parser.java:138)at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:237)at org.apache.jasper.compiler.ParserController.parse(ParserController.java:102)at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:204)at org.apache.jasper.compiler.Compiler.compile(Compiler.java:394)at org.apache.jasper.compiler.Compiler.compile(Compiler.java:370)at org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:660)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:400)at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:742)at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:602)at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:541)at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:896)at org.apache.jsp.login_jsp._jspService(login_jsp.java:82)

重新部署项目后，后又变成了这样的错误

于是思考可能是因为仅仅添加了c.tld不够，全局搜索，发现还引用了其他的.tld文件

SEVERE: Servlet.service() for servlet [jsp] threw exception
org.apache.jasper.JasperException: The absolute uri: [http://java.sun.com/jsp/jstl/functions] cannot be resolved in either web.xml or the jar files deployed with this applicationat org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:56)at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:472)at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:121)at org.apache.jasper.compiler.TagLibraryInfoImpl.generateTLDLocation(TagLibraryInfoImpl.java:325)at org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:154)at org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:419)at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:484)at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1421)at org.apache.jasper.compiler.Parser.parse(Parser.java:138)at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:237)at org.apache.jasper.compiler.ParserController.parse(ParserController.java:102)at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:204)at org.apache.jasper.compiler.Compiler.compile(Compiler.java:394)at org.apache.jasper.compiler.Compiler.compile(Compiler.java:370)at org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:660)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:400)at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:742)

2.解决方案

（1）将项目用到的.tld文件复制到项目的WEB-INF根目录下

（2）在web.xml中添加如下几行：

  <jsp-config><taglib><taglib-uri>http://java.sun.com/jsp/jstl/core</taglib-uri><taglib-location>/WEB-INF/c.tld</taglib-location></taglib><taglib><taglib-uri>http://java.sun.com/jsp/jstl/fmt</taglib-uri><taglib-location>/WEB-INF/fmt.tld</taglib-location></taglib><taglib><taglib-uri>http://java.sun.com/jsp/jstl/functions</taglib-uri><taglib-location>/WEB-INF/fn.tld</taglib-location></taglib></jsp-config>

注意：web.xml中的标签内部，如有其他内容，需要将上述几行写到该标签内部的最前面，否则可能会有错误，如下图。

原来的项目并没有出现这样的问题，推测可能是像这个链接中所说的tomcat的配置有问题
https://stackoverflow.com/questions/4928271/how-to-install-jstl-the-absolute-uri-http-java-sun-com-jstl-core-cannot-be-r

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