Re: [rules-users] Trivial rule with condition in RHS won't compile, help please
I would assume that you're trying to test out rule writing and see
what works and what doesn't. I don't believe you can use if
statements in the RHS.
Normally, anytime you want to use "if" statements inside the RHS, it's
a sure sign that you should move it to the LHS and create separate
rules.
You can actually make your rule even simpler:
rule "test"
dialect "mvel"
when
//empty LHS automatically implies true
then
System.out.pritln("***")
end
Cheers,
Chris
On Dec 3, 2009, at 11:43 AM, Barry Kaplan wrote:
The following rule:
rule "test" dialect "mvel"
when
eval(true)
then
if (true) {
System.out.println("***")
}
end
Fails with:
java.lang.RuntimeException: Unable to build expression for
'consequence':
was expecting type: java.lang.Object; but found type: void ' if
(true) {
System.out.println("***")
}
true
' : [Rule name='test']
I can't for the live of me figure out what mvel is bitching about.
Note that the following does compile:
rule "test" dialect "mvel"
when
eval(true)
then
// if (true) {
System.out.println("***")
// }
end
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