I’m now working on Drools, it is a Jboss product (whish itself is now under redhat umbrella).
If you need to run drools on eclipse remember the following things :

1. Compile under java 1.4 only and not upper (till Drools 4.0.3)
2. After making a sample project (for a test purpose) you definitely will get an error message if you don’t manually add org.eclipse.jdt.core_ to your java library

For mor information see the posting below :

1. Same problem and the solution from Jboss
2. A good resource to find out what JavaDialectConfiguration is

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