Setup Java Code Quality

[ghjansen]

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[ghjansen]

During #66 , 4 issues occurred:

#	Error	Reference
1	[ERROR] Failed to execute goal org.sonarsource.scanner.maven:sonar-maven-plugin:3.7.0.1746:sonar (default-cli) on project cas: Could not find a default branch to fall back on. -> [Help 1]	https://community.sonarsource.com/t/could-not-find-a-default-branch-to-fall-back-on/25095
2	[ERROR] Failed to execute goal org.sonarsource.scanner.maven:sonar-maven-plugin:3.7.0.1746:sonar (default-cli) on project cas: Project 'ghjansen_cas' can't have 2 modules with the following key: ghjansen_cas -> [Help 1]	https://stackoverflow.com/questions/43627759/sonar-maven-plugin-same-project-key-for-all-modules-does-not-work
3	Due to an upgrade, you need first to re-analyze the target branch 'master' before analyzing this short-lived branch.	N/A
4	Fail to process issues of component 'x' (Visit of Component {key=x,type=FILE} failed)	https://community.sonarsource.com/t/fail-to-process-issues-of-component/31835

As the error 4 is still pending solution, a new round of tests will start now.