javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/apache/jsp/tag/web/template_tag

For no apparent reason I started getting the following exception on my JSP page:
org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/apache/jsp/tag/web/rendertag_tag

org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/apache/jsp/tag/web/template_tag

I did not change anything in the libraries used by the project.
graham on 11-07-2013 12:41
The reason might be an error on your JSP page that causes the JSP engine to redirect to an error page. This error page contains tags that are not in the classpath and an exception is thrown.
graham on 11-07-2013 12:42

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