Where placed the scm tag? - maven

Question

I have a little probleme with the scm tag in my pom.xml file.
My project architecture is like this:
Parent
Submodule1
Submodule2
reactor
Parent is the project which hold all maven plugins configuration, librairies version ect. It's the parent of reactor project which is the parent of all submodules.
Reactor is a pom.xml which contains tags to compile all submodules.
I would like put the scm tag on the parent pom.xml because it's the higher pom.xml. But I get an error when I want to do a "mvn release:prepare".
So I put the scm tag in the reactor pom.xml and it works.
It's good for me, it works :) but I don't understand why I need to put the scm tag in the reactor pom.
Someone can explain me this behavior ?
Thanks.
Edit:
Here is the folder structure:
root
parent
pom.xml (parent)
submodule1
pom.xml
submodule2
pom.xml
pom.xml (reactor)
Here is the interesting part of pom reactor:
<parent>
<groupId>groupId</groupId>
<artifactId>parent</artifactId>
<relativePath>./parent/pom.xml</relativePath>
<version>1.0.2-SNAPSHOT</version>
</parent>
<modules>
<module>parent</module>
<module>submodule1</module>
<module>submodule2</module>
</modules>
Finally, here is the error for the release:prepare:
[INFO] Unable to tag SCM
Provider message:
The svn tag command failed.
Command output:
svn: Path 'http://10.211.55.4/svn/trunk/reactor' does not exist in revision 112

Answer 1

First requirement is that trunk, tags and branches folder in SVN exist which i assuem but
you have to define the scm part only in the reactor and not in the parent.
root
+-- pom.xml (reactor)
+-- parent
! +-- pom.xml (parent)
+-- submodule1
! +-- pom.xml
+-- submodule2
+-- pom.xml
Furthermore you should define the maven-release-plugin (reactor) as well with true.
The default handling of such situation is that Maven will do relative changing of the SVN paths. This will produces trouble like you have. So you have to put the information into the reactor pom NOT into the parent pom. Very important is to have only a single configuration.
Furthermore i would recommend to remove the parent and put the information into the reactor, cause you would get trouble during site generation phase.
root
+-- pom.xml (parent)
+-- submodule1
! +-- pom.xml
+-- submodule2
+-- pom.xml