Replacing field injection with constructor injection

What problem are you trying to solve?

We want to convert a bunch of classes that used Spring field injection to constructor injection. We are willing to live with some caveats (e.g. only works if no constructors, select annotations, etc).

Describe the situation before applying the recipe

class A {
   @Autowired
   @Qualifier("B")
    private B b;
}

Describe the situation after applying the recipe

class A {
    private B;

    public A(@Qualifier("B") b) {
        this.b = b;
    }
}

Any additional context

We could likely get value from something that didn't hit all the corner cases. However, if there are a bunch of corner cases that ultimately means an unending feature request on this, it's not like we really need this.

Are you interested in contributing this recipe to OpenRewrite?

Yes.

No file or test is named, so begin by reviewing the repository's existing Spring recipe entry points and unit-test conventions. Use the issue's before-and-after examples to define the initial transformation, then verify the stated constructor, annotation, qualifier, and caveat cases.