Recepie example for changing application.properties (or yaml) for a Spring Boot 3 application

Question

a newbie to write recepies. What I'm going to try to accomplish is to read an application.properties (or yamal) file and convert values and entries to different ones. I've been searching around but can't really find a good example that I can look at.

For example:

spring:
  datasource:
    url: ${spring.datasource.url}
    username: ${spring.datasource.username}
    password: ${spring.datasource.password}

change to something like this:

spring:
  datasource:
    connectionString: ${spring.datasource.url}
    user: ${spring.datasource.username}
    pwd: ${spring.datasource.password}

So if anyone got something and can share it I'd appreciate it. Thanks Andy

Answer 1

Have you looked at the examples we have for other Spring properties?

type: specs.openrewrite.org/v1beta/recipe
name: org.openrewrite.java.spring.boot3.SpringBootProperties_3_3
displayName: Migrate Spring Boot properties to 3.3
description: Migrate properties found in `application.properties` and `application.yml`.
tags:
  - spring
  - boot
recipeList:
  - org.openrewrite.java.spring.ChangeSpringPropertyKey:
      oldPropertyKey: spring.couchbase.env.ssl.key-store
      newPropertyKey: spring.couchbase.env.ssl.bundle

Taken from rewrite-spring/src/main/resources/META-INF/rewrite/spring-boot-33-properties.yml: https://github.com/openrewrite/rewrite-spring/blob/18f671d02ed987610b0a7203ff89aaae8143af1c/src/main/resources/META-INF/rewrite/spring-boot-33-properties.yml#L19-L29