org.apache.axis.transport.http.HTTPSender cannot be cast to org.apache.axis.Handler
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I'm migrating an axis 1.2.1 application between two app servers I get the following class cast exception.

    Caused by: java.lang.ClassCastException: org.apache.axis.transport.http.HTTPSender cannot be cast to org.apache.axis.Handler

Has anyone seen this before? 
What am I doing wrong?