Enabling Spring Boot DevTools, Lombok, and Configuration Processor for Hot Reload and Code Generation

The author, a senior architect, introduces three essential tools for Spring Boot projects: DevTools for hot reload, Lombok for reducing boilerplate, and the Configuration Processor for property metadata.

Spring Boot DevTools enables automatic recompilation after code changes. It can be added by selecting the appropriate option when creating a project or by inserting the following Maven dependency:

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

In IntelliJ IDEA, enable the DevTools checkboxes in Settings → Build, Execution, Deployment → Compiler , then press Ctrl+F9 after editing code. In Eclipse, simply save the file ( Ctrl+S ) to trigger recompilation.

Lombok simplifies Java bean creation by generating constructors, getters, setters, and other methods at compile time. Add Lombok with the following dependency:

<dependency>
  <groupId>org.projectlombok</groupId>
  <artifactId>lombok</artifactId>
  <optional>true</optional>
</dependency>

Install the Lombok plugin in the IDE, then use annotations such as @Data , @AllArgsConstructor , and @NoArgsConstructor . Example:

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

Spring Configuration Processor provides metadata for @ConfigurationProperties classes, enabling IDE assistance for property names. Add the processor with:

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

To avoid packaging the processor in the final JAR, exclude it in the Maven build section:

<build>
  <plugins>
    <plugin>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-maven-plugin</artifactId>
      <configuration>
        <excludes>
          <exclude>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
          </exclude>
        </excludes>
      </configuration>
    </plugin>
  </plugins>
</build>

Following these steps gives developers hot‑reloading, concise data models, and IDE‑friendly configuration support, greatly improving productivity in backend development.