'How the spring-boot-starter-data-redis works?

I find the jar only three common files, no java file, no pom.xml file. How it works? I'am confused, thanks~

➜  jar -tf spring-boot-starter-data-redis-2.5.1.jar
META-INF/
META-INF/MANIFEST.MF
META-INF/LICENSE.txt
META-INF/NOTICE.txt
spring-data-redis


Solution 1:[1]

The package also includes a pom.xml which defines some dependencies on other projects like spring-data-redis, lettuce-core. These dependencies will be included in your build process. So there's no actual code in the jar.

Example from the spring-boot-starter-data-redis 2.0.6-RELEASE pom.xml:

 <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
      <version>2.0.6.RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.data</groupId>
      <artifactId>spring-data-redis</artifactId>
      <version>2.0.11.RELEASE</version>
      <scope>compile</scope>
      <exclusions>
        <exclusion>
          <artifactId>jcl-over-slf4j</artifactId>
          <groupId>org.slf4j</groupId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>io.lettuce</groupId>
      <artifactId>lettuce-core</artifactId>
      <version>5.0.5.RELEASE</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>

Solution 2:[2]

As Luc said, if you look inside the artifact you'll see a POM https://repo1.maven.org/maven2/org/springframework/boot/spring-boot-starter-data-redis/2.5.2/spring-boot-starter-data-redis-2.5.2.pom that brings all the needed dependencies. Baeldung has a good article on how starters work https://www.baeldung.com/spring-boot-starters

Solution 3:[3]

It's code in jar spring-boot-autoconfigure, in package org.springframework.boot.autoconfigure.data.redis , the core class is RedisAutoConfiguration

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Luc De pauw
Solution 2 BSB
Solution 3 sjy

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