Enable jsf shared libraries on Weblogic and put the following Seam 2.1.2 libs in drools-guvnor.war/WEB-INF/lib:
/jboss-seam-2.1.2/lib:
asm.jar
cglib.jar
commons-logging.jar
hibernate.jar
hibernate-annotations.jar
hibernate-commons-annotations.jar
hibernate-entitymanager.jar
log4j.jar
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Wesley Akio Imamura
São Paulo - SP - Brazil