code: private Binding<?> findBinding(Injectee injectee) {
      Key<?> key = BindingUtils.toKey(injectee);
      if (key == null) {
        return null;
      }
      
      // We can't do anything about HK2 @Contracts
      if (BindingUtils.isHk2Contract(injectee)) {
        return null;
      }
      
      // Classes with a @Contract annotation are SPIs. They either exist or
      // not. They must be explicit bindings in the world of Guice.
      if (BindingUtils.isJerseyContract(injectee)) {
        return injector.getExistingBinding(key);
      }
      
      // We've to use Injector#getBinding() to cover Just-In-Time bindings
      // which may fail with an Exception because Guice doesn't know how to
      // construct the requested object.
      return injector.getBinding(key);
    }
docs: Returns a {@link Guice} {@link Binding} for the given HK2 {@link Injectee}
  or {@code null} if there is no such binding (i.e. Guice doesn't have it and
  doesn't know how to build it).