I could be wrong, but I think you need to migrate your code as 11 uses Jakarta 
syntax, just like 10.1 does.

From: Jim Anderson <jjanderson52...@gmail.com>
Sent: Monday, October 21, 2024 11:55 AM
To: users@tomcat.apache.org
Subject: Help with tomcat 11 failure

Hi, I was working on a web application about 2 years ago and I am finally 
getting back to my work on this application. However, when I try to bring up 
the app as a web page in firefox, tomcat is failing with a stack trace which I 
am attaching

Hi,

I was working on a web application about 2 years ago and I am finally getting 
back to my work on this application. However, when I try to bring up the app as 
a web page in firefox, tomcat is failing with a stack trace which I am 
attaching to this email.

Looking at the stack trace, I see that the class:
     javax.servlet.jsp.tagext.TagLibraryValidator
was not found.

My questions is: Where is the TagLibraryValidator class to be found?

Jim Anderson

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