Steve Chaloner questions

Steve Chaloner answers

• In Java, I need to group the keys of a hash map based on the basis of their values
• java Playframework GlobalSettings deprecation for onStart
• Error:java: javacTask: source release 8 requires target release 1.8
• Using wrapper class instead of static variables
• Java: synchronize on String object [duplicate]
• Produce a comma separated list using StringBuilder
• Randomizing a string in Java
• How to integrate Play (web framework), Deadbolt (authorization) and Slick (database access)
• How to find the date of an object in Java.
• Play Framework 2.4 don't accept "public static Result" for controllers