What Sachidananda said applies to a version of the Java Code Quality and Security plugin >= 6.1, it does not support anymore JaCoCo native format. In this case, see [Coverage & Test Data] Importing JaCoCo coverage report in XML format
So you should check the version of Java Code Quality and Security in the SonarQube/Administration/Marketplace.
If the java plugin is < 6.1, it should not be related to the XML format, please run mvn -X sonar:sonar and provide the logs between:
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Sensor JaCoCo XML Report Importer [jacoco]
and Sensor JaCoCo XML Report Importer [jacoco] (done)