If Gradle is unable to locate a declared artifact for a module, this artifact is simply omitted from the dependencies. There is no way to tell which artifacts are missing from the declared artifacts for a module.

This bad behaviour has been reported with a number of causes:

• Artifact not present in repository
• HTTP 409 errors: [1]http://forums.gradle.org/gradle/topic...
• Pom Relocation Elements: GRADLE-1961

We're actively working on a fix for this problem.
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[1] http://forums.gradle.org/gradle/topics/gradle_m5_dependency_downloader_swallowing_http_409s_without_telling_us