Duplicate class definition error

Can anyone help resolve this?

15:02:06,698 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception
java.lang.LinkageError: loader (instance of  org/apache/jas开发者_如何学JAVAper/servlet/JasperLoader): attempted  duplicate class definition for name: "org/apache/jsp/tag/web/divBox_tag"

[geronimo 2.1, struts 1.2 ]

Try cleaning the deploy directory of whatever server you're using.

Try cleaning your project/s in the IDE you're using (try F5 the project/s, restart the IDE).

Try cleaning the project/s with the build tool you're using.