I resolved this error message awhile ago. You are not alone...
This error message indicates a version issue on the servlet.jar file. I
received this error message when my servlet runner(tomcat) was pointing to
an obsolete servlet.jar file. If you have an old servlet.jar file on
your computer, you will need to either rename or remove those files. Hope
that helps.
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Some relevant FAQs on JSP/Servlets can be found at:
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