Hello there. I am trying to learn JSTL, when reading this tutorial <https://www.tutorialspoint.com/jsp/jsp_standard_tag_library.htm> I get the below line that creates an error in my already existing JSP page. *<%@**taglib uri ="http://java.sun.com/jsp/jstl/core"prefix ="c"**%> --------------- example ---------------------- **|<%@ taglib uri = "http://java.sun.com/jsp/jstl/core"; prefix = "c" %> // Creates an error <html> <head> <title> <c:out> Tag Example</title> </head> <body> <c:out value = "${'<tag> , &'}"/> </body> </html>|*** ---------------- End ------------------ The error reads: *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.* Using Netbeans 22, in my Debian machine I have added the 'JSTL 1.2.7 - jstl-impl' and the 'JSTL 1.2.7 - jstl-api' jar files in the 'Library' subdirectory, but to no avail.
What am I doing wrong?

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