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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
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3

Answers


  1. 0

    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>
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  2. 0

    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

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  3. 0

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

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