There are 4 levels of interview, two technical and two managerial (one manager and one director). First interview generally is by technical member in the team. Questions typically will be on all the java fundamentals and technologies like JSP, Servlets, JMS, JNDI, JDBC, Oracle and on application server like Weblogic. They will generally have one or two puzzles either that require applying algorithms or applying logic. They give value to people. You are treated well by asking you questions like if you need water and if you are relaxed etc. In the second level of interview they generally would ask you to design a system which includes both database structure and class diagrams. This round will be tougher than first one. Once you clear this round you are sure to get the offer. Third and Fourth rounds are basically focused on knowing the reason for the change and to judge your overall capabilities other than coding.