immutables: adding javax.validation.constraints.NotEmpty annotaion producing errors in generated code

Hi, there seems to have been some regression. I’m using immutables 2.5.5

@Value.Immutable
@BaseStyle
public abstract class UserImmutable {

    @NotEmpty
    abstract String getUsername();

}

is resulting in

/**
 * Immutable implementation of {@link UserImmutable}.
 * <p>
 * Use the builder to create immutable instances:
 * {@code User.builder()}.
 */
@SuppressWarnings({"all"})
@Generated({"Immutables.generator", "UserImmutable"})
public final class User extends UserImmutable {
  private final java.lang.@NotEmpty String username;
.
.
.
/**
   * @return The value of the {@code username} attribute
   */
  @Override
  java.lang.@NotEmpty String getUsername() {
    return username;
  }
.
.
.
}

java.lang. is being added into the generated field and method text. The import for the annotation is correctly generated. My BaseStyle is only to change the naming convention. I’m compiling using Maven, as directed in the docs.