A Java REPL will soon be coming to a JDK near you. Robert Field, engineer on the Langtools team at Oracle, recently proposed the creation of a Java REPL ("Read-Evaluate-Print-Loop") project. After a vote, the project, known as Project Kulla was approved. A REPL is essentially a scripting shell or console, such as a UNIX shell or Groovy console, that can be used for algorithm exploration.
JSR-353, the Java API for JSON Processing (JSON-P), has reached final approval ballot this month. JSON-P (similar to JAXP) consists of a Streaming API (similar to StAX) and an Object Model API (similar to DOM). Please note that this API does not include JSON data binding (similar to JAXB), and is unrelated to the more popular JSONP or "JSON with padding".