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Generic with Variable Type Arguments
public interface Foo<R, P...> {
    public R bar(P...) {/*misc*/}
}

public class Foo<R, P> {
  /*
   * Not sure how you intend to provide any kind of implementation
   * here since you don't know what R or P are.
   */
  public R bar(P parameters) { ... }
}

public class SomeFoo extends Foo<SomeResult, Pair<Baz, Bar>> {
  public SomeResult bar(Pair<Baz, Bar> parameters) { ... }
}

SomeFoo foo = ...
SomeResult result = foo.bar(Pair.of(baz, bar));

class TypedInstance<T>{
   Class<T> type;
   T instance;
}

public whatever(TypedInstance<? extends Object>... whatever){
  ...
  doSomethingWith(whatever[0].type, whatever[0].instance);
  ...
}