maven resolution of properties and inheritance - not working for first part of maven processing (when it "scans for projects")?

[Marshall Schor <ms...@schor.com>]

I am using a maven setup with the following structure:

top-level:  pom
    |
    +---- sub-level pom
            |
            +---- sub-sub-project pom(s)
                       
The lower level poms specify their super poms as the one that is one 
level above them; this 3 level structure is in place to allow factoring 
out common parts of the build information at 2 different levels.

Can someone confirm the following, which I have discovered via slow 
experimentation:

Even though the maven documentation says "groupId:artifactId:version are 
all required fields (although, groupId and version need not be 
explicitly defined if they are inherited from a parent - more on 
inheritance later)." in http://maven.apache.org/pom.html#Maven_Coordinates,

     the groupId appears to *not* be an inheritable item for the first 
part of maven processing, where it is "scanning for projects"

Also, in this first part of maven processing, it appears that 
<properties> are not substituted. 

The evidence I have for these comes from failures in maven building; I 
ran with the --debug flag.  Here's the case where a ${variable} isn't 
being substituted, and the groupId was omitted (expecting it to default 
from the parent).

C:\a\Eclipse\3.3\apache\uimaj>mvn install --debug
+ Error stacktraces are turned on.
Maven version: 2.0.7
Java version: 1.6.0_02
OS name: "windows xp" version: "5.1" arch: "x86"
[DEBUG] Building Maven user-level plugin registry from: 'C:\Documents 
and Settings\Administrator\.m2\plugin-registry.xml'
[DEBUG] Building Maven global-level plugin registry from: 
'c:\p\Maven\maven-2.0.7\bin\..\conf\plugin-registry.xml'
[INFO] Scanning for projects...
[DEBUG] Searching for parent-POM: 
org.apache.uima:uimaj-eclipse-plugins::2.3.0.incubating-SNAPSHOT of 
project: null:uimaj-ep-debug:bundle:null in relative path:
 ../uimaj/eclipse-plugin-superPom
[DEBUG] Path specified in <relativePath/> 
(../uimaj/eclipse-plugin-superPom) is a directory. Searching for 
'pom.xml' within this directory.
[DEBUG] Invalid parent-POM referenced by relative path 
'../uimaj/eclipse-plugin-superPom' in parent specification in 
null:uimaj-ep-debug:bundle:null:
  Specified: 
org.apache.uima:uimaj-eclipse-plugins::2.3.0.incubating-SNAPSHOT
  Found:     
null:uimaj-eclipse-plugins:pom:${uimaj-release-eclipse-version}   

The "Found" is showing "null" for the groupId, where I had expected it 
to be the groupId from the parent.  The version string I expected to be 
substituted from the ${uimaj-release-eclipse-version} variable.

Should this be working, or is it working as designed?

-Marshall

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