Can't leave out variadic args in Java interop with Clojure

When calling interop functions into Java land with Clojure you have pass an empty array. While it's OK in Java/Groovy/... to:

RatpackPac4j.requireAuth(SAML2Client)

... you have to pass an empty array in Clojure:

(RatpackPac4j/requireAuth SAML2Client (into-array Authorizer []))