Call controller from another controller -Java

one controller to call a method on the 2nd controller. There are 2 implementations I have seen so far.
1st Implementation
return new Controller().method(request, response);
2nd Implementation
@Autowired
private Controller controller.

return this.controller.method(request, response);
Which is the right implementation, what are the problems if any with either of them.
Ans:
What is the advantage of this? Doing so breaks a lot of convention, and you should be considering revising, i.e. breaking up the controller code and maybe moving some of the logic into the business layer.
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Ans: 
Sounds like you need to refactor the code. Extract what is common between the two controllers into a separate class, then call that from either controller.
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Ans:


if you do a call in between controller either there is a flaw or you want to make a redirection which is totally valid. If redirection is the case just return in your controller code as follow.
return "redirect:/yourDestinationControllerPath.htm";

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