I have completed SCJP1.4 and SCWCD1.4 exams in 2007 and i would like to continue my exam. that is Oracle Certified Expert Java Platform, EE Web Services Developer(~SCDJWS). while doing the research, i found two exam codes( 1Z0-862 and 310-220) and getting confused. these two exam codes are same? and can you point to some good book?