The project can no longer be deployed. After analysis I don't find the ch.qos.logback.classic.boolex.GEventEvaluator class under the embedded  logback-classic 1.2.11 jar. 

Here's the console output proving it:

java.lang.IllegalStateException: Logback configuration error detected: 
ERROR in ch.qos.logback.core.joran.action.NestedComplexPropertyIA -
 Could not create component [evaluator] of type [ch.qos.logback.classic.boolex.GEventEvaluator] 
 java.lang.ClassNotFoundException: ch.qos.logback.classic.boolex.GEventEvaluator

So Why this implementation was deleted? I didn't find a replacement for it in your documentation. Any help will be appreciated. 

It's not a bug.