TRUNK-4228: SonarQube - Nullcheck of value previously dereferenced
TRUNK-4232: SonarQube - Write to static field from instance method
#TRUNK-4227: SonarQube - Correctness - Possible null pointer dereference
Merge pull request #568 from tadeitto/TRUNK-4228

TRUNK-4228: SonarQube - Nullcheck of value previously dereferenced
Merge pull request #567 from tadeitto/TRUNK-4232

TRUNK-4232: SonarQube - Write to static field from instance method
Merge pull request #573 from jkondrat/TRUNK-4227

#TRUNK-4227: SonarQube - Correctness - Possible null pointer dereference
TRUNK-4236: SonarQube - Redundant nullcheck of value known to be non-null