John Smith questions

• Simple explanation of Akka Actors
• Play 2.0 Scala and async callbacks
• Play 2.0 widgets
• Play & Akka and blocking threads for database access
• What are the guarantees for scala access qualifiers?
• Calling Scala Monads from Java #map
• Lower type bound on Scala field in mutable, covariant class?
• Java <-> Scala Collection conversions, Scala 2.10 [duplicate]
• scala class constructors and abstract types
• JPA Criteria API and type safety

John Smith answers