How mica-auto Simplifies Spring Boot Starter Creation with Annotation Processors

1. Introduction

mica-auto (Spring boot starter tool) is a basic component of the Mica Spring Cloud microservice framework, used to generate basic configuration for Spring boot starters.

2. Principle

mica-auto uses an Annotation Processor, a feature present since JDK 1.6. The processor scans annotations at compile time and can generate Java code automatically, similar to Lombok.

3. Features

Automatically generate spring.factories and spring-devtools.properties configurations.

Generate FeignClient entries into spring.factories for automatic Feign configuration in mica-cloud.

Generate Java SPI configuration by adding the

@AutoService

annotation.

4. 2.x Update Log

Added AutoConfigDataLocationResolver.

Added AutoConfigDataLoader.

Added AutoEnableCircuitBreaker.

Upgraded Spring Boot to 2.4.1 (non‑mandatory, no compatibility issues).

5. Usage

Note:

If your project uses Lombok, place the mica-auto dependency after Lombok.

5.1 Maven

<code>&lt;dependency&gt;
  &lt;groupId&gt;net.dreamlu&lt;/groupId&gt;
  &lt;artifactId&gt;mica-auto&lt;/artifactId&gt;
  &lt;version&gt;2.0.3&lt;/version&gt;
  &lt;scope&gt;provided&lt;/scope&gt;
&lt;/dependency&gt;
</code>

5.2 Gradle ≥ 5.x

<code>annotationProcessor("net.dreamlu:mica-auto:2.0.3")</code>

5.3 Gradle < 5.x

<code>compileOnly "net.dreamlu:mica-auto:2.0.3"</code>

5.4 Java SPI example

Add the

@AutoService

annotation and specify the SPI interface

Processor.class

.

<code>package foo.bar;

import javax.annotation.processing.Processor;

@AutoService(Processor.class)
public class MyProcessor implements Processor {
    // …
}
</code>

AutoService will automatically generate the SPI configuration file

META-INF/services/javax.annotation.processing.Processor

containing:

<code>foo.bar.MyProcessor</code>

6. Mica Ecosystem

mica (Spring Cloud microservice component set): https://gitee.com/596392912/mica

mica-auto (Spring boot starter tool): https://gitee.com/596392912/mica-auto

mica-weixin (JFinal Weixin Spring boot starter): https://gitee.com/596392912/mica-weixin

mica-mqtt (MQTT component based on t‑io): https://gitee.com/596392912/mica-mqtt

Spring Cloud HTTP/2 solution (h2c): https://gitee.com/596392912/spring-cloud-java11

Follow the author’s Gitee page for more Java open‑source components: https://gitee.com/596392912