Error added: 2010-05-20T14:38:46Z
this is not solution for all cases . I am also getting this error and I am not packaging servlet-api.jar
Remove servlet-api.jar from your war file. if it is not there, search for javax folder with javax/servlet/http/HttpServlet structure, and remove that from the lib folder of your war.
Don\'t package servlet-api.jar with your .war file.
works for me
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