What is the difference between @RequiredArgsConstructor(onConstructor = @__(@Inject)) and @RequiredArgsConstructor?

Question

What is the difference between Lombok's

@RequiredArgsConstructor 

and

@RequiredArgsConstructor(onConstructor = @__(@Inject))

I know that RequiredArgsConstructor injects all the final dependencies in constructor only.

Answer 1

@RequiredArgsConstructor
class MyClass {
  private final DependencyA a;
  private final DependencyB b;
}

will generate

public MyClass(DependencyA a, DependencyB b) {
  this.a = a;
  this.b = b;
}

while

@RequiredArgsConstructor(onConstructor = @__(@Inject))
class MyClass {
  private final DependencyA a;
  private final DependencyB b;
}

will generate

@Inject
public MyClass(DependencyA a, DependencyB b) {
  this.a = a;
  this.b = b;
}

From JDK 8 onwards, the syntax @RequiredArgsConstructor(onConstructor_ = {@Inject}) is also accepted.

I know RequiredArgsConstructor injects all the final dependencies.

All required dependencies which consists of final and @NonNull fields.