[guvnor-dev] How to import standard java classe(eg: wrapper classes) inside a drools guvnor.

Hi I am new to drools. Forgive me if the question iam asking is too dumb :P. I want to write java code inside the rules in the drools-guvnor using the standard classes, like parsing a string using wrapper classes. How can i import these java classes? -- Thanks and Regards, Sumatheja Dasararaju