spring-boot-configuration-processor

The spring-boot-configuration-processor is a Java annotation processor that is used by the Spring Boot framework to generate metadata for configuration properties.

Configuration properties in Spring Boot are used to bind external configuration values to Java objects. These properties can be defined in various sources such as properties files, YAML files, environment variables, and command line arguments.

The spring-boot-configuration-processor helps in generating the necessary metadata for these configuration properties, which includes the property names, data types, default values, descriptions, and validation constraints. This metadata is then used by the Spring Boot framework to provide auto-completion and validation support in IDEs, as well as to generate documentation for the configuration properties.

To use the spring-boot-configuration-processor, you need to add it as a dependency in your project's build configuration. For example, if you are using Maven, you can add the following dependency:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <optional>true</optional>
</dependency>

Once the dependency is added, you can annotate your configuration classes or properties with Spring Boot's @ConfigurationProperties annotation. The spring-boot-configuration-processor will then process these annotations and generate the necessary metadata.

Here's an example of a configuration class annotated with @ConfigurationProperties:

@ConfigurationProperties("myapp")
public class MyAppProperties {

    private String name;
    private int port;

    // Getters and setters

}

In this example, the spring-boot-configuration-processor will generate metadata for the myapp.name and myapp.port properties. This metadata can be used by the Spring Boot framework to bind the values from the external configuration sources to the name and port properties of the MyAppProperties class.

Overall, the spring-boot-configuration-processor simplifies the process of working with configuration properties in Spring Boot by providing auto-completion, validation, and documentation support