Java's generics are implemented by erasure,
which implies that there no information available at runtime that a instance of a List is of a certain generic type, for example Boost.
So I don't think this is possible.

Note that some things do work in erasure IIRC, like the generic type of a defined field in a class is available at runtime:
public class Foo {
private List<Bar> list;
}
but that's not useful in this case :)

Op 17-10-11 11:30, Martin A schreef:

Hello,

In my rules file I'd like to set something like this:

rule "mayThrowDice"

when

$user : User($gp : gameplay)

$gameplay(this == $gp)

then

exists List<Boost>() {

..... some business logic

}

end

But it looks like there is no generics support. How can I make sure there is a List of type Boost inserted into the session?

Thank you,

Martin
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With kind regards,
Geoffrey De Smet