Add ScanningRecipe for migrate Hooks.enableAutomaticContextPropagation() to Spring property

[nurdy-kim]

What's changed?

I added a new ScanningRecipe - MigrateHooksToReactorContextProperty. This recipe automatically removes the Hooks.enableAutomaticContextPropagation() method call from main methods within @SpringBootApplication classes. After that it adds the new spring.reactor.context-propagation=true property to application.properties or application.yml files, which provides the same functionality.

Anything in particular you'd like reviewers to focus on?

I'm particularly concerned about whether the addSpringProperty method is working as expected. I'd appreciate it if you could pay close attention to that part during the review.

Anyone you would like to review specifically?

@nmck257, @timtebeek

Checklist

• I've added unit tests to cover both positive and negative cases
• I've read and applied the recipe conventions and best practices
• I've used the IntelliJ IDEA auto-formatter on affected files

[timtebeek]

While perhaps not as common in practice, we'd need to correctly handle multi module projects too, which might each have this hook and a configuration properties file, or multiple. You can look at this example for how to handle that with an alternative Accumulator:

rewrite-spring/src/main/java/org/openrewrite/java/spring/boot2/search/IntegrationSchedulerPoolRecipe.java

Lines 245 to 250 in e7a8b99

	@Data
	static class JavaProjects {
	Set<JavaProject> applicableProjects = new HashSet<>();
	Set<JavaProject> processedProjects = new HashSet<>();
	Map<JavaProject, Path> sourceToCommentByProject = new HashMap<>();
	}

[timtebeek]

Great start here @nurdy-kim ! I've called out a potential source of issues with the AtomicBoolean you'd been using. That's an older pattern we're looking to phase out on new recipes. Could you make the necessary adjustments based on the example given?

[nurdy-kim]

Thanks for the feedback! I'll make the necessary adjustments! :)

[timtebeek]

Also might be good to hook this recipe into one of the larger composites, or Spring Boot best practices, such that it's run automatically.

[nurdy-kim]

This recipe can be applicable from Spring Boot 3.2. I believe it would be a good fit for the Migrate to Spring Boot 3.2 recipe. If not, could you please provide some guidance on this?

[timtebeek]

That then makes sense, yes thanks!