Maven cyclic dependecy issue

[Los Morales]

Hi,

I’m a bit frustrated on how Maven cycles through its dependency.  Currently 
I have a project consisting of multiple sub projects—2 levels deep.  Here’s 
a hierarchy:

-->main
  --> sub1
     --> sub1sub1
     --> sub1sub2
  --> sub2

The main project has a POM looking like this:

<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/maven-v4_0_0.xsd";>
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.project.main</groupId>
   <artifactId>main</artifactId>
   <version>1.0-SNAPSHOT</version>
   <name>Main Project</name>
   <url>http://maven.apache.org</url>
   <packaging>pom</packaging>
   <properties>
       <main.version>1.0-SNAPSHOT</main.version>
   </properties>
   <modules>
       <module>sub1</module>
       <module>sub2</module>
   </modules>
...
</project>


Now say my sub2 project looks like this:

<project>
   <parent>
       <artifactId>main</artifactId>
       <groupId>com.project.main</groupId>
       <version>1.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.project.main.core</groupId>
   <artifactId>main-core-api</artifactId>
   <name>Main Core API</name>
   <version>${main.version}</version>
   <packaging>jar</packaging>
</project>

Sub project 1 and its repective subprojects are similar.  Now, from my root 
project (main), I run any mvn command, I get the following error:

###################################
[INFO] Error building POM (may not be this project's POM).

Project ID: com.project.main.sub1.sub2:main-sub1-sub2:jar:${main.version}

Reason: Cannot find parent: com.project.main.sub1:main-sub1 for project: 
com.project.main.sub1.sub2:main-sub1-sub2:jar:${main.version}
####################################


So I go to my sub2 project and run any mvn command, I get the same error.  
Looks like its not able to figure out the runtime value of {main.version}.  
Hence I can not continue with any build process.  Any help would be 
appreciated.  Thanks in advance.

-los

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