Dialect Error Message Drool

Question

I have deployed a webApp in Tomcat 7. I am using Drools. Now when I am running this continuously the Drools throwing runtime exception.

I have added the \"core-

Answer 1

This only means that you've not added the JAR that furnishes Java class via java build path not sure which class

Answer 2

Finally I solved the issue by the kind and helpful suggestion from Master Steve. I was creating KnowledgeBase for each and every request; that was creating problems. When I created only one Knowledgebase for the entire application and each session for each request, application becomes fast and also error free.