[rules-users] Trivial rule with condition in RHS won't compile, help please

[Barry Kaplan]

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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