General
Oracle Java Doc , API Ref 7 , 8 Ant ,
Java 8
Lambda
Tutorials
Oracle Tutorial , Core Servlet (Good) , Java Code Geeks Main , 30 Java tricks , Garbage Collection , Lambda ,
Web Services
Jersey WS , JaxB ,
Spring
Study Trails Tutorial , Tutorials Point , Spring Guides ,
Hibernate
Hibernate Tutorial ,
Collections
Collestion Tutorial , Good article on Hashing, When to choose set, map, list, How Hash Maps Work,
Input/Output
IO Tutorial ,
Concurrency
Threads Intro, ThreadLocal, Jenkov Tutorial , Locks, Synchronization,
Misc
Oracle RMI trail , RMI Tutorial 1 , RMI Tutorial 2
J2EE Technologies
Jboss Main Getting Started