Enforcing build order...
------------------------
Key: MNG-5104
URL: http://jira.codehaus.org/browse/MNG-5104
Project: Maven 2 & 3
Issue Type: Improvement
Components: Bootstrap & Build, Reactor and workspace
Affects Versions: 2.2.1
Environment: Linux AMD64
Reporter: Ancoron Luciferis
Currently, building multi-module aka. reactor projects is working, but does not
help the developers to ensure a certain level of isolation of their modules.
E.g. imagine the following project tree:
* <root>
** Component A
*** A.api
*** A.jpa
*** A.ejb (depends on A.api, A.jpa)
** Component B
*** B.api
*** B.jpa
*** B.ejb (depends on B.api, B.jpa, A.api)
** Component C
*** C.api
*** C.jpa
*** C.ejb (depends on C.api, C.jpa, A.api)
...and all things are just fine.
Now, some developer comes in, not fully aware of the "big picture", producing
something like this:
* <root>
** Component A
*** A.api
*** A.jpa (depends on B.jpa)
*** A.ejb (depends on A.api, A.jpa)
** Component B
*** B.api
*** B.jpa
*** B.ejb (depends on B.api, B.jpa, A.api, C.ejb)
** Component C
*** C.api
*** C.jpa
*** C.ejb (depends on C.api, C.jpa, A.api)
...so in an old-school build with tools like Ant this would fail to build as
the build order is clear and strict, according to best-practices. Not so with
Maven. In the first case Maven might (although unlikely and yet to be seen)
come up with a clear build order like this:
# <root>
# Component A
# A.api
# A.jpa
# A.ejb
# Component B
# B.api
# B.jpa
# B.ejb
# Component C
# C.api
# C.jpa
# C.ejb
...however, in the second case Maven will not fail to build and instead come up
with something like this:
# <root>
# Component A
# A.api
# Component B
# B.jpa
# A.jpa
# A.ejb
# B.api
# Component C
# C.api
# C.jpa
# C.ejb
# B.ejb
All artifacts are build correctly, but it is no longer guaranteed that e.g.
"Component A" could be used without "Component B", therefore introducing a
requirement and eventually a lot of changes to the build-/tool-/test-chain.
So we would like to have an option to disable the Maven "magic" here and just
stupidly build according to the {{<module>}} tags we've carefully written.
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