Hi everyone,
when I build my project, Maven tells me the following:
[WARNING]
[WARNING] Some problems were encountered while building the effective
model for com.hannobraun:scalable-dynamics_2.8.0:jar:0.3-SNAPSHOT
[WARNING] 'artifactId' contains an expression but should be a constant.
@ com.hannobraun:scalable-dynamics_${scala.version}:0.3-SNAPSHOT,
/home/hanno/Projects/ScalableDynamics/pom.xml
[WARNING]
[WARNING] It is highly recommended to fix these problems because they
threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support
building such malformed projects.
[WARNING]
I think the ability to have an expression in the artifactId is very
useful for Scala projects built with Maven.
Due to binary incompatibility between code that was compiled with
different versions of the Scala compiler, Scala projects have adopted
the convention of adding the Scala version used to the artifact id. See
this for example: http://mvnrepository.com/artifact/org.scala-tools.testing
Due to the ability to use an expression in the artifact id I can do
something like this:
<properties>
<scala.version>2.8.0</scala.version>
</properties>
<artifactId>scalable-dynamics_${scala.version}</artifactId>
...
<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>${scala.version}</version>
</dependency>
<dependency>
<groupId>org.scala-tools.testing</groupId>
<artifactId>specs_${scala.version}</artifactId>
<version>1.6.5</version>
<scope>test</scope>
</dependency>
</dependencies>
This approach is pretty much error-proof and low-maintenance. Requiring
a constant artifactId would introduce the possibility of errors every
time I update to another Scala version.
While I understand the notion of wanting to restrict what a user can do
for safety reasons, I think it would be a shame to take power away from
the users. You'll never be able to anticipate what kind of productive
uses people will find for this power.
Regards,
Hanno
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