Make sure you didn't miss anything with this list of the Best of the Week in the Enterprise Integration Zone (March 20 - March 27). Here they are, in order of popularity:
The Java 8 lambda syntax and functional interfaces have been a productivity boost for Java developers. But there is one drawback to functional interfaces.
The official Java EE 7 Hands-on-Lab is an excellent learning resource. It was initiated by my former colleague Arun Gupta (now at Red Hat).
Spring MVC has supported asynchronous request processing flow for sometime now and this support internally utilizes the Servlet 3 async support of containers like Tomcat/Jetty.
This post which highlights the time out feature while executing asynchronous REST requests on server side using the JAX-RS (2.0) API
Spring MVC Test can help greatly to thoroughly test controllers including their configuration.