Exception starting filter Seam Filter java.lang.ClassCastException: org.jboss.seam.servlet.SeamFilter cannot be cast to javax.servlet.Filter
Ever notice this error when deploying your application with Seam.
This usually happens due to two reasons.
You have duplicate seam jars in your application (e.g. EAR/lib and WAR/WEB-INF/classes/lib)
You have a servlet-api jar bundled as part of your app, which you never should as your web server has it (tomcat/jboss/geronimo etc)
Hope this helps someone.. coz I’ve stumbled into this and solved it couple of times.
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