Trying to set up a Single Sign-on Tomcat 7 server? Here's how to do so, complete with a look at what SPNEGO is, authentication vs. authorization, and Single Sign-on basics.
Angular JS is a JavaScript framework for developing applications and generally expects data to be in the form of JSON, here you'll see how to get JSON from XML.
Groovy is a dynamic language with powerful capabilities for typing and compilation on the Java platform; use this snippet to debug it without compiling.
Understand the Java Memory Model for the heap, as well as garbage collection algorithms, and memory leak best practices all with diagrams and bite-sized descriptions.