I see I am not the only one having this problem from 14 hours ago.
At my office, other projects are failing too but the message shown make reference to sonar-maven-plugin:2.6:sonar
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.codehaus.mojo:sonar-maven-plugin:2.7:sonar (default-cli) on project x: Unable to determine structure of project.
Any ideas?