[jboss-jira] [JBoss JIRA] Created: (JBBUILD-548) Building a submodule and what it depends on

[Paul Gier (JIRA)]

Building a submodule and what it depends on 
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                 Key: JBBUILD-548
                 URL: https://jira.jboss.org/jira/browse/JBBUILD-548
             Project: JBoss Build System
          Issue Type: Task
          Components: Sonatype
            Reporter: Paul Gier
            Assignee: Paul Gier


>From Max's email:

The biggest issue is that we cannot seem to figure out how Maven is supposed to work when it comes to projects that consists of sub-modules. At least the workflow Maven 'defaults' to seem to make this construct very cumbersome to maintain.

Example:
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In hibernate core we have a structure like this:

trunk
 pom.xml
 parent
  pom.xml
 core
  pom.xml
 connection-c3p0
  pom.xml
<other modules>
<pom.xml per module>

Lets say we change something in the "core" module and I wan to go and check if connection-c3p0 has an issue with that.
Our intuition says that one should be able to do:

cd connection-c3p0
mvn compile

But this will not cause core to be recompiled even though this module has a dependency on it and it should be possible for maven
to deduce this needs to be compiled. Instead it goes to the local repo and check if something happend there - and no there didn't, we are just trying to do a compile check.

On the blog someone mentioned reactor or the new -amd option, but doing the following:

cd connection-c3p0
mvn -amd compile

does not seem to change anything, even with a change in core nothing gets recompiled.

What -amd does seem to do is the "opposite" direction. i.e. going to root and type

mvn -am -pl core,connection-c3p0 compile

does seem to do this - but why does the user have to tell Maven manually which dependencies it want built ? 

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