fix some sonar issues
add some loggings
add curly braces to if/else/for/while/do statements
fix misstake added curly braces at wrong place
reorder modifiers
use isEmpty() to check if collection is empty or not
add annotation for sonar fix
remove empty statements
add default case
add LOGGING for empty methods should possible abstract
add break to switch statement
cleaned up logging messages
cleanup method if else return expression
update log message
Merge pull request #2 from springer-opensource/fixSonarIssues

Fix sonar issues