Vlad Bochenin questions

Vlad Bochenin answers

• jackson: mapping some fields of json to inner fields of class
• Java 8 Join Map with Collectors.toMap
• Hamcrest. Match item in collection with 2 specific property values
• Jackson - Deserialize Interface to enum
• Stream of integers
• Pass class type as parameter to use in ArrayList?
• Parallel dispatch of `groupBy` groups in Reactor
• AspectJ - change value of method parameter
• Java Optional if object is not null - returns the method result, if null - returns default value