java.lang.ClassCastException: class cannot be cast to javax.servlet.Servlet

Solution Verified - Updated -

Environment

  • JBoss Enterprise Application Platform (EAP) 6.x

Issue

  • We see the following exception:

    java.lang.ClassCastException: package.className cannot be cast to javax.servlet.Servlet

Resolution

  • Ensure any class mapped as a Servlet via annotations or in the application WEB-INF/web.xml extends javax.servlet.http.HttpServlet as noted by the [EE6 tutorials](https://docs.oracle.com/javaee/6/tutorial/doc/bnafu.html

Root Cause

  • A class mapped as a Servlet via annotations or in the application WEB-INF/web.xml does not extend Servlet.

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