The following Groovy code prints \"it works\"
def printIt(Class extends Exception> clazz) {
println \"it works\"
}
printIt(String.class)
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Check out this link.
[...]In some ways this is at odds with the emphasis of dynamic languages where in general, the type of objects can not be determined until runtime. But Groovy aims to accomodate Java's static typing when possible, hence Groovy 1.5 now also understands Generics. Having said that, Groovy's generics support doesn't aim to be a complete clone of Java's generics. Instead, Groovy aims to allow generics at the source code level (to aid cut and pasting from Java) and also where it makes sense to allow good integration between Groovy and Java tools and APIs that use generics.[...]
In conclusion, I don't think it's possible to obtain that information at runtime.