In groovy, is there a way to check if an object has a given method?

Use respondsTo

class Foo {
   String prop
   def bar() { "bar" }
   def bar(String name) { "bar $name" }
}

def f = new Foo()

// Does f have a no-arg bar method
if (f.metaClass.respondsTo(f, "bar")) {
   // do stuff
}
// Does f have a bar method that takes a String param
if (f.metaClass.respondsTo(f, "bar", String)) {
   // do stuff
}