[rules-users] Drools issue

[djb]

In Drools, you can call any java code in the "when" block using eval(...),
however, it is not advised because it cannot be used as a node in the RETE
graph.

so, 
rule "basic rule"
        when
                $a: Account( validAccount == true ) // condition
                eval($a.isValidAccount("blah"))
        then
                System.out.println("Account is not valid"); // consequence
end 

depends on your goal though -- if you are making a validation program, you
probably want to use rule templates.  otherwise, you might as well just use
a HashMap and a 3 line java program.
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