Maven project JPA: Persist vs Merge -> www.17cats.com/newblog/categories/%E5%B0%8F%E6%9D%8E/?order=0.8023000978464431&aim=bc4ff4ef-28f8-4fc2-a314-ac8ccf09c94e&pso=16582884&cost=CEZVGsmdLpxWTcHs&tsx=X3SLLGs5GGOygSEI