In Maven, Why Run 'mvn clean'?

Question

I am wondering what the major difference between running mvn compile and mvn clean compile are, in practicality.

I understand what the actu

Answer 1

If you don't do clean compile then it means you are still allowing to work with some obsolete classes. If your module suppose to migrate to new class then even you missed that, there won't be any compilation error due to old class exist in target/classes. This will remain unnoticed till same module is built at some other place/machine with clean compile goal.