features/src/main/java/org/apache/karaf/cellar/features/FeaturesSynchronizer.java
http/balancer/src/main/java/org/apache/karaf/cellar/http/balancer/ServletSynchronizer.java

features/src/main/java/org/apache/karaf/cellar/features/FeaturesEventHandler.java
http/balancer/src/main/java/org/apache/karaf/cellar/http/balancer/BalancerEventHandler.java