Sonar Cobertura Plugin not finding coverage.xml file
I had the same issue (SonarQube 4.4., Cobertura 1.6.2, Jenkins + maven + java8) and I just finally figured out solution for the problem:
sonar.cobertura.reportPath=target/site/cobertura/coverage.xml
Notice the missing "/" from the beginning of the path!
It actually tried to search from absolute root directory in my Linux server.