There are many Java based technologies. What Java based technologies have survived the test of time? What technologies have you used for a considerable period of time and still use regularly. What technologies have helped, rather than hindered you on a day to day basis. Please don't response with items that you may have used for a short period of time.
In my experience:
Core Java. Collections framework. JUnit. JMeter. JPA/Hibernate. Log4J. Javadoc. Maven. Netbeans.