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• Why do I get

  No Format
  java.lang.NoClassDefFoundError: javax/servlet/Filter

  ? *

You probably have servlet.jar floating around somewhere it shouldn't be. This really messes up the classloaders since Tomcat's classloaders don't act quite as normal as one expects (see links above). servlet.jar should only be found only once in $CATALINA_HOME/common/lib.

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