Ebook: Programming Scala: Tackle Multi-Core Complexity on the Java Virtual Machine

As a few others have pointed out, the title is misleading, there is little in the book on the actual subject of "solving multi-core" complexity. Instead, treat it as a good introductory book for a Java programmer. The book covers all the major API's, language constructs and syntax in a concise form, without overloading the reader with unnecessary detail. It's an easy read if you're looking to capture the high-points of the language.