Why in jpaRepository is used Long?-CodePudding

I'm new with Spring boot and JpaRepository. I was wondering why the use of Long instead of another data type?

CodePudding user response：

There is no need to use Long, you can use any type like String, UUID or a custom type.

E.g. all these are possible:

public interface UserRepository extends CrudRepository<User, Long>

public interface UserRepository extends CrudRepository<User, String>

public interface UserRepository extends CrudRepository<User, UUID>

public interface UserRepository extends CrudRepository<User, UserId>

The important bit is that it refers to whatever you use as primary key for your entity.