What is the difference between defining @Transactional on class vs method

Question

Case1

@Transactional
public class UserServiceImpl implements UserService {

    ...................
    public void method1(){
        try{
                    


        

Answer 1

Suppose you have the following class:

@Transactional(readOnly = true)
public class DefaultFooService implements FooService {

  public Foo getFoo(String fooName) {
    // do something
  }

  // these settings have precedence for this method
  @Transactional(readOnly = false, propagation = Propagation.REQUIRES_NEW)
  public void updateFoo(Foo foo) {
    // do something
  }
}

The @Transactional annotation on the class level will be applied to every method in the class.

However, when a method is annotated with @Transactional (like, updateFoo(Foo foo)) this will take precedence over the transactional settings defined at the class level.

More info:

• Transaction management in Spring