Java: multi-threading, data structures, 1.5, 1.6 JEE: jms, jmx, jpa, soap, xml, jsf (icefaces, richfaces) Spring: ioc, aop, orm, jdbc, security, acegi, mvc, web services, rest, remoting, rmi, http invoker, hessian, burlap, jmx, xml XML: jaxb, XMLBeans, XStream Testing: junit, junit+spring, mockito, selenium, soapui Logging: sl4j, log4j Methodolody: agile, scum, tdd DB: Microsoft SQL, derby, hsqldb, MongoDB Tools: Eclipse, STS, Intellij Idea Source control: svn, mercurial