Hi,
I have happily used maven 1.0 and trying to switch to M2 mainly because I want
to work with modules. But I have some difficulties to understand how it is
supposed to work.
I have tried the following:
mvn archetype:create -DgroupId=org.trial -DartifactId=test
cd test
mvn jar:jar
and I get
...
[WARNING] JAR will be empty - no content was marked for inclusion!
...
and the jar effectively does not contain the class files.
But if I do:
mvn compiler:compile jar:jar
The jar contains the expected class files.
Isn't supposed the jar:jar execute the precious phases (that is compile) before
making the jar?
Furthermore in any case the resulting jar contains the following:
META-INF/
META-INF/MANIFEST.MF
...
META-INF/maven/
META-INF/maven/org.trial/
META-INF/maven/org.trial/test/
META-INF/maven/org.trial/test/pom.xml
META-INF/maven/org.trial/test/pom.properties
What is the purpose of these pom.xml and pom.properties in the resulting jar?
They contain information about my working directory which is of no use for a
released jar and I even don't see where they come from. They seem to be
magically generated by maven.
Another mystery:
If I do
mvn deploy:deploy
I get:
...
[ERROR] BUILD ERROR
[INFO]
----------------------------------------------------------------------------
[INFO] The packaging for this project did not assign a file to the build
artifact
...
but it if I do:
mvn compiler:compile jar:jar deploy:deploy
It works fine (excepted for the added META-INF mentioned above).
Also:
m2 deploy
works fine too. However I get the message: THE m2 COMMMAND IS DEPRECATED -
PLEASE RUN mvn INSTEAD
but if I use
m2 jar:jar
I get the same result than with `mvn jar:jar` (compile phase is skipped).
Did I miss something?
If I remember, maven 1.0 was more consistent and worked fine out of the box.
Thanks.
Oscar
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