Dependency Management with BOM

Giriş

Açıklaması şöyle

BOM stands for "Bill Of Materials". A BOM is a special kind of POM that is used to control the versions of a project’s dependencies and provide a central place to define and update those versions.

Açıklaması şöyle

The Bill Of Material is a special POM file that groups dependency versions that are known to be valid and tested to work together. This will reduce the developers’ pain of having to test the compatibility of different versions and reduce the chances to have version mismatches.

1. BOM Yazmak

Açıklaması şöyle

BOM elements:

1. a pom packaging type: <packaging>pom</packaging>.

2. a dependencyManagement the section that lists the dependencies of a project.

Inside the dependencyManagement we will set all of the dependencies needed and specific versions of the dependency because it is mandatory.

Örnek

Şöyle yaparız

<project ...>
  <modelVersion>4.0.0</modelVersion>
  <groupId>reflectoring</groupId>
  <artifactId>reflectoring-bom</artifactId>
  <version>1.0</version>
  <packaging>pom</packaging>
  <name>Reflectoring Bill Of Material</name>
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>io.reflectoring</groupId>
        <artifactId>logging</artifactId>
        <version>2.1</version>
      </dependency>
      <dependency>
        <groupId>io.reflectoring</groupId>
        <artifactId>test</artifactId>
        <version>1.1</version>
      </dependency>
    </dependencies>
  </dependencyManagement>
</project>

2. BOM'u Kullanmak

İki yöntem var.

1.BOM As A Parent Yöntemi

2.BOM as a Dependency Yöntemi

2.1 BOM As A Parent Yöntemi

Bir projede tek bir parent BOM olabilir. <parent>...</parent> tagleri içine yazılır

Örnek

Şöyle yaparız

<project ...>
  <modelVersion>4.0.0</modelVersion>
  <groupId>baeldung</groupId>
  <artifactId>Test</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>pom</packaging>
  <name>Test</name>
  <parent>
    <groupId>baeldung</groupId>
    <artifactId>Baeldung-BOM</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
</project>

Örnek

Şöyle yaparız

<project ...>
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>reflectoring</groupId>
    <artifactId>reflectoring-bom</artifactId>
    <version>1.0</version>
  </parent>
    
  <groupId>reflectoring</groupId>
  <artifactId>new-project</artifactId>
  <version>1.0.0-SNAPSHOT</version>
  <packaging>jar</packaging>
  <name>New Project</name>
    
  <dependency>
    <groupId>io.reflectoring</groupId>
    <artifactId>logging</artifactId>
  </dependency>
</project>

2.2 BOM as a Dependency

Bir projede tek bir parent BOM olabilir, ancak bazen bir başka projeden de parent BOM gelebiliyor. Bu durumda BOM kendi pom.xml dosyamıza <dependencyManagement>..</dependencyManagement> olarak kopyalanabilir. Kullanırken şöyle yaparız

<type>pom</type>
<scope>import</scope>

Örnek

Şöyle yaparız. Burada SpringBoot Starter Parent projesini Bill Of Materials olarak kullandık

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-dependencies</artifactId>
      <version>2.5.4</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

Örnek

Şöyle yaparız

<project ...>
  <modelVersion>4.0.0</modelVersion>
  <groupId>baeldung</groupId>
  <artifactId>Test</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>pom</packaging>
  <name>Test</name>
    
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>baeldung</groupId>
        <artifactId>Baeldung-BOM</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>
</project>

Örnek

Şöyle yaparız

<project ...>
  <modelVersion>4.0.0</modelVersion>
  <groupId>reflectoring</groupId>
  <artifactId>new-project</artifactId>
  <version>1.0.0-SNAPSHOT</version>
  <packaging>jar</packaging>
  <name>New Project</name>
    
  <dependency>
    <groupId>io.reflectoring</groupId>
    <artifactId>logging</artifactId>
  </dependency>
    
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>reflectoring</groupId>
        <artifactId>reflectoring-bom</artifactId>
        <version>1.0</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>
</project>