maven clean install Failed to execute goal org.apache.maven.plugins

Question

From Eclipse mars version, pom.xml - Run As - maven clean and i got the following error message with Build Failure.
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-clean-plugin:2.5:clean (default-clean) on project testing-framework: Execution default-clean of goal org.apache.maven.plugins:maven-clean-plugin:2.5:clean failed: Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its dependencies could not be resolved: Failed to collect dependencies at org.apache.maven.plugins:maven-clean-plugin:jar:2.5 -> org.apache.maven:maven-plugin-api:jar:2.0.6: Failed to read artifact descriptor for org.apache.maven:maven-plugin-api:jar:2.0.6: Could not transfer artifact org.apache.maven:maven-plugin-api:pom:2.0.6 from/to central (https://repo.maven.apache.org/maven2): repo.maven.apache.org: Unknown host repo.maven.apache.org -> [Help 1]

Answer 1

I had the same problem. I solved it by killing java.exe process in Task Manager and re-excuting maven clean install.

Answer 2

Unknown host repo.maven.apache.org

sounds like a networking issue. Maybe check wether you need to supply proxy information within your settings.xml. Here's the documentation on how to supply one.

Alternativly, Eclipse might expose its own proxy settings to its Maven integration, but I'm not sure about that, I only use Maven from console. Still, its worth the check and maybe the config.