The parent pom in the Maven Central Repo seems to be missing

[chees]

Trying to use the Java lib with a dependency tool like SBT or Maven fails. There seems to be a parent pom missing or something like that.
See also:
http://stackoverflow.com/questions/18385456/how-to-use-google-api-services-datastore-protobuf-with-sbt-or-maven?noredirect=1

[eddavisson]

Thanks for the report. Can you provide a sample pom.xml or .sbt file and a Maven/SBT command line that reproduces the failure?

[proppy]

When trying to run mvn package for a new project including the dependencies:

<dependencies>
  <dependency>
    <groupId>com.google.apis</groupId>
    <artifactId>google-api-services-datastore-protobuf</artifactId>
    <version>v1beta1-rev2-1.0.1</version>
  </dependency>
</dependencies>

It produces the following error

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.414s
[INFO] Finished at: Fri Aug 23 18:13:47 UTC 2013
[INFO] Final Memory: 5M/14M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project adams: Could not resolve dependencies for project google-cloud-datastore-demos:adams:jar:1: Faile\
d to collect dependencies for [com.google.apis:google-api-services-datastore-protobuf:jar:v1beta1-rev2-1.0.1 (compile)]: Failed to read art\
ifact descriptor for com.google.apis:google-api-services-datastore-protobuf:jar:v1beta1-rev2-1.0.1: Failure to find com.google.apis:google-\
api-services-datastore-protobuf-parent:pom:v1beta1-rev2-1.0.1 in http://repo.maven.apache.org/maven2 was cached in the local repository, re\
solution will not be reattempted until the update interval of central has elapsed or updates are forced -> [Help 1]

[chees]

I just looked a bit more into the underlying problem. It seems that it's indeed the parent project that's missing from Maven Central. When I installed it locally it sorta worked. See my steps below:

1. git clone https://github.com/GoogleCloudPlatform/google-cloud-datastore.git
2. brew install protobuf-c
3. export JAVA_HOME=$(/usr/libexec/java_home)
4. cd google-cloud-datastore/java
5. mvn install

In my new Play2 Scala SBT project I used this dependency:
"com.google.apis" % "google-api-services-datastore-protobuf" % "v1beta1-rev2-1.0.1"
This lib could now actually be resolved, but now I got lots of these warnings:
[warn] Class com.google.protobuf.Parser not found - continuing with a stub.

After I also added that dependency explicitly it worked:
"com.google.protobuf" % "protobuf-java" % "2.5.0"

However, this sounds weird to me since protobuf is already a dependency:
https://github.com/GoogleCloudPlatform/google-cloud-datastore/blob/master/java/datastore/pom.xml#L11

[proppy]

It looks like the original issue is fixed (parent pom missing).

The parent pom is there now:
http://search.maven.org/#artifactdetails%7Ccom.google.apis%7Cgoogle-api-services-datastore-protobuf-parent%7Cv1beta1-rev2-1.0.1%7Cpom

Can you open another issue about the protobuf warning? Which version of proto-c did you install with brew?

[chees]

Thanks, that fixed the original problem indeed :)
Regarding the protobuf issue:

I have 2.5.0 installed but it seemed to use 2.4.1 sometimes.

To test this I made 1 empty project with Maven and 1 empty project with SBT.
Both had google-api-services-datastore-protobuf v1beta1-rev2-1.0.1 as their only dependency.

The maven project resolved the dependencies and picked protobuf-java-2.5.0 right away.

The sbt project resolved the dependencies and picked protobuf-java-2.5.0 at first since google-api-services-datastore-protobuf depends on it, but then it got to google-http-client-protobuf (which also has a dependency on protobuf-java but doesn't specify a version) at which point sbt started downloading protobuf-java-2.4.1 for some reason. I don't understand why, but that's the reason it doesn't work.
After I explicitly added "com.google.protobuf" % "protobuf-java" % "2.5.0" to my sbt project it did stick with version 2.5.0, so that's a workaround.

Anyway, it looks like the problem is in the google-http-client-protobuf pom (or maybe in the ivy resolver?) and not in this lib.