just add some more comments. Remember Java technologies are more stable comparing for example by .NET which has a revolution version by version, and most of them are based on JSRs, and a JSR is hardly deprecated or changed completely.
So the more you go through the standards, your won't lose your knowledge.
For example instead of spending time to learn  SWT, JFace, Struts, Spring and Hibernate, try AWT, Swing, JSF, EJB, and JPA. and Let learning non-standard techs in case.

Basic knowledge (networking, computer structure, compiler, regular expressions and so on) are so important, so if your univ field is(was) not related to computer,
you must work  on it.

Interoperable architectures and technologies such as Web Service, XML, BPEL and SOA also have a high rank.

Finally do not lose your self-confidance in an interview if you haven't heard of a technology or worked with it, they are just tools and you are the brain, and if you are smart enough and have a standard knowledge of Java EE, you have always so many opportunities to be employed in a smart and successful company, and be update in a way you like.