Java Plain Client Application - Upgrade from RTC 3.0 to 4.0

though a definitive answer depends on the specific api's used in your application and if those api's have undergone some changes.. with some experience that i have, most likely you will have to recompile.  some of the classes might have undergone refactoring, some might have just got deprecated and no longer available.. so best bet is to recompile.. i generally add complete set of jars to my class path instead of resolving only the used ones... may not be a good practice but works and saves time for me.. .so i had to recompile for a move from 3.0 to 3.0.1..