JaninoEventEvaluatorBase currently does not specify the classloader while creating the ScriptEvaluator instance. Due to this it uses the Thread's Context Classloader (TCCL). This causes problem in using Janino based event evaluator in OSGi env as there TCCL may not have the visibility to Logback classes.

At min we should expose option to specify the JaninoEventEvaluatorBase classloader as the classloader to use.