在 jersey 项目中包含 jersey-bom 导入范围依赖项的目的是什么? [英] What is the purpose of including the jersey-bom import scoped dependency in a jersey project?

问题描述

当使用 中了解更多信息.

基本上，BOM 允许您根据需要添加任意数量的球衣依赖项，而无需担心混合不良版本:

<依赖><依赖性><groupId>org.glassfish.jersey.containers</groupId><artifactId>jersey-container-grizzly2-http</artifactId><!-- 因为 BOM，所以不需要版本 --></依赖><依赖性><groupId>org.glassfish.jersey.media</groupId><artifactId>jersey-media-json-jackson</artifactId><!-- 因为 BOM，所以不需要版本 --></依赖></依赖关系>

When generating a jersey based project using the jersey-quickstart-grizzly2 artifact

mvn archetype:generate -DarchetypeArtifactId=jersey-quickstart-grizzly2 
-DarchetypeGroupId=org.glassfish.jersey.archetypes -DinteractiveMode=false 
-DgroupId=com.example -DartifactId=simple-service -Dpackage=com.example 
-DarchetypeVersion=2.7

The pom generated a jersey-bom dependency which can be deleted:

<dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.glassfish.jersey</groupId>
                <artifactId>jersey-bom</artifactId>
                <version>${jersey.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

And this dependency:

<dependency>
      <groupId>org.glassfish.jersey.containers</groupId>
      <artifactId>jersey-container-grizzly2-http</artifactId>
</dependency>

this is how the maven dependency graph looks like:

What is the purpose of including the jersey-bom dependency in the project ?

解决方案

You should not delete the jersey-bom from dependencyManagement.

A BOM (bill of materials) packages related dependencies so that their versions will work together. You can read more about it in the maven docs on this page.

Because this lives in dependencyManagement (not in dependencies), it is not actually adding dependencies to your project, it's just centralizing version management. If you are not familiar with the difference, read more in this SO answer.

Basically, the BOM allows you to add as many jersey dependencies as you need without worrying about mixing bad versions:

<dependencies>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-grizzly2-http</artifactId>
        <!-- NO VERSION NEEDED BECAUSE OF THE BOM -->
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-json-jackson</artifactId>
        <!-- NO VERSION NEEDED BECAUSE OF THE BOM -->
    </dependency>
</dependencies>

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