Magnolia项目Maven依赖版本未定义问题及模块安装报错咨询

Great question! Let's unpack this to understand why this module behaves differently from other info.magnolia.rest dependencies in your project.

First, why most Magnolia modules don't need explicit versions #

Your Magnolia project likely uses a Bill of Materials (BOM) dependency from Magnolia. This BOM acts as a central version manager, defining consistent versions for all official core and supported modules. When you add dependencies like info.magnolia.rest:magnolia-rest-integration or info.magnolia.rest:magnolia-rest-services, Maven pulls the version directly from the BOM, so you don't need to specify it manually.

What makes magnolia-rest-content-delivery special? #

The magnolia-rest-content-delivery module is an optional extension module, not part of the core REST suite. Unlike the core REST modules, it's not included in the default Magnolia BOM's version mappings. That means Maven can't resolve its version automatically from the BOM, hence the error:

[ERROR] 'dependencies.dependency.version' for info.magnolia.rest:magnolia-rest-content-delivery:jar is missing.

How to fix this #

You have two straightforward options to resolve the issue:

1. Explicitly specify the version in your dependency
   Match the version to your project's Magnolia core version (e.g., if you're on Magnolia 6.2.45):

   <dependency>
     <groupId>info.magnolia.rest</groupId>
     <artifactId>magnolia-rest-content-delivery</artifactId>
     <version>6.2.45</version>
   </dependency>
   

2. Add the module to your project's dependency management
   If you want to keep using version consistency via your project's setup, declare the module in your dependencyManagement section (using your Magnolia version property):

   <dependencyManagement>
     <dependencies>
       <!-- Keep your existing BOM and core dependencies here -->
       <dependency>
         <groupId>info.magnolia.rest</groupId>
         <artifactId>magnolia-rest-content-delivery</artifactId>
         <version>${magnolia.version}</version>
       </dependency>
     </dependencies>
   </dependencyManagement>
   

   Then you can add the dependency in your dependencies block without specifying the version, just like your other REST modules.

Just make sure the version you use matches your Magnolia core version exactly to avoid compatibility issues!

内容的提问来源于stack exchange，提问作者AlexeiP