JAVA & J2EE

http://www.techinterviews.com/index.php?p=143 : Basic Java
Questions asked on Web development interviews for Java, includes
database connectivity and Java server pages.

http://www.inf.utfsm.cl/~mmoossen/prj/java_online.html

http://www.techinterviews.com/index.php?p=151

http://www.studyjava.org/

http://www.hk8.org/old_web/java/index.htm (O’REILLY) [Contains Java, Perl, TCP/IP, Unix, Java Enterprise, LINUX, Oracle PL/SQL, WWW]

http://studyjava.org/exam/notes/intro.html : JAVA tutorial

J2EE interview questions at Exforsys
http://www.exforsys.com/qb/com.php?com=1&cat=1