1371: fixing issues reported by nie
1371: fixing issues reported by nie

HaStr/kieker,HaStr/kieker,leadwire-apm/leadwire-javaagent,kieker-monitoring/kieker,kieker-monitoring/kieker,kieker-monitoring/kieker,HaStr/kieker,kieker-monitoring/kieker,kieker-monitoring/kieker,HaStr/kieker,leadwire-apm/leadwire-javaagent,HaStr/kieker