java - Migrating from guava.Optional to java8.Optional -

trying migration guava optional implementation java 8 optional. got issue not able understand. here how method looks:

public optional<entity> getentity(string input) {    try{     final entity obj = otherclass.verifyentity(input);     return optional.of(obj);    } catch(exception e) {    }    return optional.empty(); } 

it looks straight forward keep getting compilation error says change return type optional<entity.

what wrong code?

try using return optional.<entity>empty();