maven multiple level inheritance exclusion-CodePudding

Say, I have this project that has 3 levels -- project, group and module. And I have pom.xml on each level: on project level, I have the dependencies across the whole project, and on group level I have the dependencies shared within the group, and module level has dependencies specific for the group. And I organize the pom file in such way: project pom (is the parent of) group pom (is the parent of) module pom.

project pom.xml

<groupId>com.example</groupId>
<artifactId>project</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>project</name> 
<packaging>pom</packaging>

<dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.framework1</groupId>
                <artifactId>depend1</artifactId>
                <version>1.0</version>         
            </dependency>
            <dependency>
                <groupId>org.framework2</groupId>
                <artifactId>depend2</artifactId>
                <version>1.0</version>         
            </dependency>
            <dependency>
                <groupId>org.framework3</groupId>
                <artifactId>depend3</artifactId>
                <version>1.0</version>         
            </dependency>
        </dependencies>
</dependencyManagement>

Say, I have group1 which would need to have dependencies depend1 and depend2 but not depend3.

group1 pom.xml

<parent>
    <groupId>com.example</groupId>
    <artifactId>project</artifactId>
    <version>0.0.1-SNAPSHOT</version>       
</parent> 
    
<groupId>com.example.project</groupId>
<artifactId>group1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>group1</name> 
<packaging>pom</packaging>

<dependencies>
    <dependency>
        <groupId>org.framework1</groupId>
        <artifactId>depend1</artifactId>
    </dependency>
    <dependency>
        <groupId>org.framework2</groupId>
        <artifactId>depend2</artifactId>                        
    </dependency>             
<dependencies>

And under group1, module1 would need both depend1 and depend2. So it would simply inherit it from group1 pom and no need to specify them.

module1 pom.xml

<parent>
    <groupId>com.example.project</groupId>
    <artifactId>group1</artifactId>
    <version>0.0.1-SNAPSHOT</version>       
</parent> 
    
<groupId>com.example.project.group1</groupId>
<artifactId>module1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>module1</name>

But for module2, it only needs depend1 but not depend2. How should I specify the exclusion? I have tried a couple of ways but none of them work. For example, I put the group1 dependencies inside a dependencyManagement tag but getting some maven error complaining about missing versions. And I have also made the module1 pom inherit from the project pom rather than the group1 pom, it seems work but that kinda breaks the intended structure. Any idea that I could implement this exclusion while preserve the project structure (in maven's perspective)?

module2 pom

<parent>
    <groupId>com.example.project</groupId>
    <artifactId>group1</artifactId>
    <version>0.0.1-SNAPSHOT</version>       
</parent> 
    
<groupId>com.example.project.group1</groupId>
<artifactId>module2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>module2</name> 

//how to include depend1 but exclude depend2?

CodePudding user response：

Declare your dependencies as follows:

project
   - pom.xml ... <dependencyManagement>
   - group1
      - pom.xml ... <dependency>depend1
      - module1
     |   - pom.xml ... <dependency>depend2; <dependency>depend1 inherited from group1
      - module2
         - pom.xml ... no <dependency> declared; <dependency>depend1 inherited from group1