Intellij-IDEA运行web项目异常

title	toc	layout	categories	tags	date
Intellij IDEA 部署 Web 项目时,web.xml 无法正常解析导致 jsp 显示错误	false	blog	blog	Intellij IDEA	2019-02-28 03:00:13 -0800

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Intellij IDEA 部署 Web 项目时,web.xml 无法正常解析导致 jsp 显示错误

错误信息

Intellij IDEA 控制台信息

 java.io.FileNotFoundException: Could not resolve XML resource [null] with public ID [-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN], system ID [http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd] and base URI [jar:file:/D:/Code/IDE-workspace/iptvView/target/WEB-INF/lib/standard-1.1.2.jar!/META-INF/c-1_0-rt.tld] to a known, local entity.
	at org.apache.tomcat.util.descriptor.LocalResolver.resolveEntity(LocalResolver.java:155)

Chrome 浏览器页面信息

HTTP Status 500 - 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
type Exception report

message 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

description The server encountered an internal error that prevented it from fulfilling this request.

exception

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 application
	org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:55)
	org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:277)
	org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:75)
	org.apache.jasper.compiler.TagLibraryInfoImpl.generateTldResourcePath(TagLibraryInfoImpl.java:250)
	org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:125)
	org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:421)
	org.apache.jasper.compiler.Parser.parseDirective(Parser.java:479)
	org.apache.jasper.compiler.Parser.parseElements(Parser.java:1435)
	org.apache.jasper.compiler.Parser.parse(Parser.java:139)
	org.apache.jasper.compiler.ParserController.doParse(ParserController.java:227)
	org.apache.jasper.compiler.ParserController.parse(ParserController.java:100)
	org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:201)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:358)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:338)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:325)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:580)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:363)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
	org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:263)
	org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1208)
	org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:992)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:939)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.52 logs.

Apache Tomcat/8.0.52

1. 项目 xxx/WEB-INF/lib 中不存在相关jar包;

可以从 mavenrepository地址 中找到相应jar包,添加相关依赖到pom.xml文件中并重新编译，查看问题是否解决。

注： 通过添加缺失jar可以解决的就不用往下看了

1. 项目依赖中存在相关依赖,依然无法正常显示页面

1. 找到项目配置的 tomcat 下 xx\apache-tomcat-8.0.52\conf\context.xml文件

1. 修改文件,添加如下内容

<Context xmlBlockExternal="false" >

注： 只需要添加下划线中的 xmlBlockExternal="false" 到 Context 标签即可

总结:

1. 出现jsp页面显示错误,一般都是缺少 jar 包所致。可检查在tomcat或编译后的文件夹中是否能够找到相关依赖。
2. 上述异常中缺失的jar有,然而本次并不是缺少jar的错误

standard-1.1.2.jar、jstl-1.2.jar、jersey-server-1.9.jar、jstl-impl.jar

1. 本博客无法解决疑问时,可简练相关关键字再搜索。

参考博客 新版Tomcat无法解析web.xml