Missing maven-repository-metadata jar

[davidzchen]

I was trying to build the Dropwizard Example with Bazel using maven_jar to pull in the jars that it depends on: https://github.com/davidzchen/dropwizard-example-bazel.

I encountered the following java.lang.NoClassDefFoundError when trying to build the project:

$ bazel build //src/main:helloworld
INFO: Elapsed time: 1.238s
java.lang.NoClassDefFoundError: org/apache/maven/artifact/repository/metadata/Versioning
        at org.apache.maven.repository.internal.DefaultVersionResolver.readVersions(DefaultVersionResolver.java:397)
        at org.apache.maven.repository.internal.DefaultVersionResolver.resolveVersion(DefaultVersionResolver.java:264)
        at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:302)
        at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:246)
        at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:223)
        at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:294)
        at com.google.devtools.build.lib.bazel.repository.MavenJarFunction$MavenDownloader.download(MavenJarFunction.java:198)
        at com.google.devtools.build.lib.bazel.repository.MavenJarFunction.createOutputTree(MavenJarFunction.java:106)
        at com.google.devtools.build.lib.bazel.repository.MavenJarFunction.compute(MavenJarFunction.java:76)
        at com.google.devtools.build.skyframe.ParallelEvaluator$Evaluate.run(ParallelEvaluator.java:879)
        at com.google.devtools.build.lib.concurrent.AbstractQueueVisitor$1.run(AbstractQueueVisitor.java:346)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: org.apache.maven.artifact.repository.metadata.Versioning
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 14 more

It appears that Bazel is missing the maven-repository-metadata jar, which provides org.apache.maven.artifact.repository.metadata.Versioning.

[kchodorow]

Whoops, working on adding it, stand by.

[davidzchen]

Thanks!

I saw that the JAR was added in commit b2922de, but it seems that the //third_party:maven_model BUILD rule was not updated to include the JAR.

[kchodorow]

Given our somewhat funky export process, the third_party/BUILD change had to be done in a separate commit, but it should be updated now. I had some issues testing it, though, let me know if it actually works for you.

[davidzchen]

Got it. It works now. Thanks!