spring boot Configuration Annotation Processor not configured

To configure the Spring Boot Configuration Annotation Processor, you need to follow these steps:

1. Add the required dependencies to your project's build file, such as Maven or Gradle.

For Maven, add the following dependency to your `pom.xml` file:

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

For Gradle, add the following dependency to your `build.gradle` file:

dependencies {
    // other dependencies
    annotationProcessor 'org.springframework.boot:spring-boot-configuration-processor'
}

2. Ensure that your Spring Boot version supports the Configuration Annotation Processor. Starting from Spring Boot 1.2.0, the Configuration Annotation Processor is automatically enabled.

3. Make sure that you have the necessary annotations in your code. The Spring Boot Configuration Annotation Processor processes annotations such as `@ConfigurationProperties`, `@Value`, and `@Validated`.

4. Build your project to trigger the annotation processing. The Configuration Annotation Processor will generate the necessary metadata for your configuration properties.

By following these steps, you should be able to configure and use the Spring Boot Configuration Annotation Processor in your project.