Is it possible to export my b4a app to a pure java source code. Lets say I want to hand over a project I created with B4A to another team who can only code in java. Will that be a possibility, or would we have to compile and decompile ?
Theoretically yes. You can find the Java code under the Objects folder.
Practically I don't recommend it as the generated code is not meant to being extendible and you are likely to break all kinds of things.