"provided" scope dependencies must be transitive
------------------------------------------------
Key: MNG-2205
URL: http://jira.codehaus.org/browse/MNG-2205
Project: Maven 2
Type: Bug
Components: Dependencies
Reporter: David Boden
Priority: Critical
A provided scope dependency can also be thought of as "compile-only".
Project A requires Sybase JConnect on the runtime classpath. Project A declares
a "provided" dependency on Sybase JConnect.
Project B depends upon Project A. Project B declares a "compile" dependency on
Project A.
Project C depends upon Project B. Project C declares a "compile" dependency on
Project B.
C
| - compile dependency
B
| - compile dependency
A
| - provided dependency
Sybase JConnect
So, does Project C transitively depend on Sybase JConnect. Yes, of course! The
"provided" dependency needs to be transitive.
Ultimately, when Project C gets deployed, Sybase JConnect needs to be somewhere
on the runtime classpath in order for the application to function. It's valid
for Project C to assume that Sybase JConnect is available and use JDBC all over
the Project C code. Project C is safe to do this because it can happily deduce
that Sybase JConnect will be there in the runtime environment because Project A
NEEDS IT.
I've got Use Cases all over my aggregated build which make it absolutely
critical and common sense that provided scope dependencies are transitive. For
the (very rare) odd case where you don't want to inherit provided dependencies,
you can <exclude/> them.
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