Maven parent pom variables are not resolved

Question

I have the following POM structure:

./foobar-common/pom.xml ./abc-window/pom.xml ./abc-datasource/pom.xml

Both abc-window pom.xml is as follows:

Answer 1

The parent in abc-window is listed as:

    <parent>
            <relativePath>../foobar-common/pom.xml</relativePath>
            <groupId>hu.abc.ringcore</groupId>
            <artifactId>foobar-common</artifactId>
            <version>1.0</version>
        </parent>

The parent in abc-datasource is listed as:

<parent>
    <relativePath>../foobar-common/pom.xml</relativePath>
    <groupId>hu.ratesoft.ringcore</groupId>
    <artifactId>foobar-common</artifactId>
    <version>1.0</version>
</parent>

So, they do not have the same groupId.

Answer 2

Use dependencyManagment in parent pom

<dependencyManagement>
  <dependencies>
    <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>${junit.version}</version>
    </dependency>
    <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-lang3</artifactId>
       <version>${commons-lang3.version}</version>
    </dependency>
    </dependencies>
  </dependencyManagement>  

add all versions in parent pom, and use dependencies without version in children

EDIT

/pom.xml                 <-parent pom
/abc-window/pom.xml     <-child module  
/abc-datasource/pom.xml <-child module  

and parent pom should contains

<project  
...  
   <properties>   
    ... 
   </properties>  
   <modules>  
      <module>abc-datasource</module>
      <module>abc-window</module>  
   </modules>   
   <build>
      <pluginManagment>   
       ...
      </pluginManagment>
   </build>
   <dependencyManagment>
    ...  
   </dependencyManagment>  
</project>