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From William Ferguson <william.fergu...@xandar.com.au>
Subject Re: problem with AAR dependency
Date Wed, 17 Dec 2014 22:20:02 GMT
Sorry Igor, I see now I omitted a chunk of context.

The reason for the error is that this component :

<dependency>
            <groupId>com.android.support</groupId>
            <artifactId>support-v13</artifactId>
            <version>21.0.2</version>
            <type>aar</type>
</dependency>

has a dependency upon

<dependency>
            <groupId>com.android.support</groupId>
            <artifactId>support-v4</artifactId>
            <version>21.0.2</version>
            <type>aar</type>
</dependency>

But when the Android team packaged up support-v13, they declared the
dependency on support-v4 as:
<dependency>
            <groupId>com.android.support</groupId>
            <artifactId>support-v4</artifactId>
            <version>21.0.2</version>
</dependency>

which is a valid definition syntactically, may well be valid inside the
Android dev team, and is parsed by the Android Gradle plugin (which makes
gross assumptions about artifact type).

But from a standard Maven perspective, that dependency definition is not
valid. Which is why tools like the dependency-plugin (and anything that
introspects deps) with fail with that dependency definition.

We are pushing back on the Android guys to generate Maven POMs that are
consumable by everyone, but the fact that the syntax allows them to
generate an underspecified dependency could be eliminated. I think this is
especially important as Maven is used by a wider and wider community. While
it stemmed from Java builds, it is now used much more widely than pure Java
libraries.

William


ᐧ

On Tue, Dec 9, 2014 at 2:39 AM, Igor Fedorenko <igor@ifedorenko.com> wrote:
>
> I am not sure I follow. Can you explain what actually happens and how
> forcing <type> element for all projects dependencies is expected to help
> the problem?
>
> --
> Regards,
> Igor
>
>
> On 2014-12-07, 19:25, William Ferguson wrote:
>
>> ## Cross posting to Maven Dev list
>>
>> One solution to this would be to change the POM specification to require
>> the type element for dependencies.
>> That would allow Maven and MavenCentral to immediately fail POMs based
>> upon dependencies that are missing the type element.
>>
>> Yes, it goes against convention over configuration, but Maven is now
>> used by many more build types than just plain Java builds so maybe we
>> need to consider that the convention is no longer to assume jar
>> dependencies.
>>
>> I would rather require a little more configuration to ensure that builds
>> are more deterministic.
>> If we want to shrink the size of the POM then the new POM format is a
>> better solution.
>>
>> William
>>
>>
>> On Thursday, December 4, 2014 1:47:33 AM UTC+10, Andreas Schildbach wrote:
>>
>>     I'm using maven-android-plugin 4.0.0 with Maven 3.0.5. I've got
>>     troubles declaring an aar dependency. Here is the pom.xml declaration:
>>
>>     |
>>     <dependency>
>>     <groupId>com.android.support</groupId>
>>     <artifactId>support-v13</artifactId>
>>     <version>21.0.2</version>
>>     <type>aar</type>
>>     </dependency>
>>     |
>>
>>     Just about any Maven command, even "mvn dependency:tree" yields:
>>
>>     [ERROR] Failed to execute goal on project wallet: Could not resolve
>>     dependencies for project de.schildbach.wallet:wallet:apk:4.13-test:
>>     Failure to find com.android.support:support-v4:jar:21.0.2 in
>>     file:///home/aschildbach/dev/android-sdk/extras/android/m2repository
>>     was cached in the local repository, resolution will not be
>>     reattempted until the update interval of android-support has elapsed
>>     or updates are forced -> [Help 1]
>>
>>     Where does that .jar type in the error message stem from? I declared
>>     aar.
>>
>>
>>
>>
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