How to use JSTL in JSP: jakarta.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/jsp/tagext/TagLibraryValidator

Question

I am using TomCatServer v10.1 for Java Web Development project. I am not able to use JSTL in JSP and the error is

HTTP Status 500 – Internal Server Error Type Exception Report

Message java.lang.NoClassDefFoundError: javax/servlet/jsp/tagext/TagLibraryValidator

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

Exception

jakarta.servlet.ServletException: java.lang.NoClassDefFoundError: javax/servlet/jsp/tagext/TagLibraryValidator org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333) jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) Root Cause

java.lang.NoClassDefFoundError: javax/servlet/jsp/tagext/TagLibraryValidator java.base/java.lang.ClassLoader.defineClass1(Native Method) java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017) java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2352) org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:800) org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1317) org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1165) java.base/java.lang.ClassLoader.defineClass1(Native Method) java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017) java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) Apache Tomcat/10.1.19

Check this Image

I also included jstl-1.2 jar file in the Calculator\src\main\webapp\WEB-INF\lib folder and tried using different versions of JSTL still the problem is not solved.