Above links are very informative for you to consider for your upgrade from EHP4, no functionality has changed on Java, but there is a different between EHp3 to EHp4. You need to check this and readjust your code if you have modified or enhanced the existing applications. typical recommendation is to go to ABAP WD based BPs as no newer functionality is available in Java WD and wont be enhanced further. Please note using new WD ABAP, will require new roles and its a project in itself. But since you are already doing major upgrade, you can consider this as you ll get the latest technologies and many new functionalities
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