Exception starting Filter in Struts2 [duplicate]

Answer 1

More detail for the above answers: Assuming you are using eclipse, it's not enough to remove the extraneous files from the .../WEB-INF/lib directory. If you make changes to your project, eclipse will redeploy the original libraries (jar files). To remove them from your build path in eclipse so they don't get redeployed, go to Window >> Preferences >> Java >> Build Path >> User Libraries, and highlight and remove the unwanted jars. (And of course remove from WEB-INF/lib if applicable).

Answer 2

I was facing the same problem too with struts 2.3.20. I solved it by removing all the unnecessary jars using only these nine jars that are:

commons-fileupload-1.3.1jar,
commons-io-2.2.jar,
commons-lang3-3.2.jar,
commons-logging-1.1.3.jar,
freemarker-2.3.19.jar,
javassist-3.11.0.GA.jar,
ognl-3.0.6.jar,
struts2-core-2.3.20.jar,
xwork-core-2.3.20.jar"

Answer 3

Remove unused plugins like struts2-gxp-plugin-2.3.16.1.jar from /WEB-INF/lib. Also org.apache.struts2.dispatcher.FilterDispatcher is deprecated in Struts 2.3.16.1. See a Simple Example of configuring web.xml for the Struts2 framework by adding filter and filter-mapping tags.