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HTTP Status 500 – Internal Server Error

Type Exception Report

Message org.apache.jasper.JasperException: Failed to load or instantiate TagLibraryValidator class: [org.apache.taglibs.standard.tlv.JstlCoreTLV]

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.apache.jasper.JasperException: org.apache.jasper.JasperException: Failed to load or instantiate TagLibraryValidator class: [org.apache.taglibs.standard.tlv.JstlCoreTLV] org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:589) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:425) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:380) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:328) jakarta.servlet.http.HttpServlet.service(HttpServlet.java:777) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) Root Cause

org.apache.jasper.JasperException: Failed to load or instantiate TagLibraryValidator class: [org.apache.taglibs.standard.tlv.JstlCoreTLV] org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:54) org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:294) org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:142) org.apache.jasper.compiler.TagLibraryInfoImpl.createValidator(TagLibraryInfoImpl.java:360) org.apache.jasper.compiler.TagLibraryInfoImpl.(TagLibraryInfoImpl.java:195) org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:429) org.apache.jasper.compiler.Parser.parseDirective(Parser.java:487) org.apache.jasper.compiler.Parser.parseElements(Parser.java:1444) org.apache.jasper.compiler.Parser.parse(Parser.java:138) org.apache.jasper.compiler.ParserController.doParse(ParserController.java:244) org.apache.jasper.compiler.ParserController.parse(ParserController.java:105) org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:206) org.apache.jasper.compiler.Compiler.compile(Compiler.java:391) org.apache.jasper.compiler.Compiler.compile(Compiler.java:367) org.apache.jasper.compiler.Compiler.compile(Compiler.java:351) org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:603) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:399) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:380) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:328) jakarta.servlet.http.HttpServlet.service(HttpServlet.java:777) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) Root Cause

java.lang.ClassCastException: class org.apache.taglibs.standard.tlv.JstlCoreTLV cannot be cast to class jakarta.servlet.jsp.tagext.TagLibraryValidator (org.apache.taglibs.standard.tlv.JstlCoreTLV is in unnamed module of loader org.apache.catalina.loader.ParallelWebappClassLoader @4943defe; jakarta.servlet.jsp.tagext.TagLibraryValidator is in unnamed module of loader java.net.URLClassLoader @6ce253f1) org.apache.jasper.compiler.TagLibraryInfoImpl.createValidator(TagLibraryInfoImpl.java:356) org.apache.jasper.compiler.TagLibraryInfoImpl.(TagLibraryInfoImpl.java:195) org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:429) org.apache.jasper.compiler.Parser.parseDirective(Parser.java:487) org.apache.jasper.compiler.Parser.parseElements(Parser.java:1444) org.apache.jasper.compiler.Parser.parse(Parser.java:138) org.apache.jasper.compiler.ParserController.doParse(ParserController.java:244) org.apache.jasper.compiler.ParserController.parse(ParserController.java:105) org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:206) org.apache.jasper.compiler.Compiler.compile(Compiler.java:391) org.apache.jasper.compiler.Compiler.compile(Compiler.java:367) org.apache.jasper.compiler.Compiler.compile(Compiler.java:351) org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:603) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:399) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:380) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:328) jakarta.servlet.http.HttpServlet.service(HttpServlet.java:777) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) Note The full stack trace of the root cause is available in the server logs.

Apache Tomcat/10.0.12

Olaf Kock
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Subramanian Arunachalam
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    Welcome to Stackoverflow. Please take the [tour], read [ask] and edit your question to contain an actual question: It's not enough to just dump an error message. Give us steps to reproduce, preferably in the form of a [mcve]. You might want to try deploying your app on Tomcat 9 . See [this question](https://stackoverflow.com/q/64387472/13447) for the reason – Olaf Kock Oct 18 '21 at 06:53
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    It sounds like your taglib is for JakartaEE 8 or earlier (`javax.*` namespace), so it will not work on a JakartaEE 9 (`jakarta.*` namespace) implementation like Tomcat 10. Either downgrade to Tomcat 9, or make sure you use a JakartaEE 9 compatible taglib. – Mark Rotteveel Oct 18 '21 at 10:31

0 Answers0