Lombok的@AllArgsConstructor注解失效问题求助

问题场景 #

父类BaseEntity定义：

@Data
@NoArgsConstructor
@AllArgsConstructor
@SuperBuilder
public class BaseEntity {
    protected int id;
}

子类User定义：

@EqualsAndHashCode(callSuper = true)
@NoArgsConstructor
@AllArgsConstructor
@Data
@SuperBuilder
public class User extends BaseEntity{
    @Email
    @NotNull
    private String mail;
    @Pattern(regexp = "^(?=.*[0-9])(?=.*[!@#$%^&*])[a-zA-Z0-9!@#$%^&*]{6,16}$")
    @NotNull
    private String password;
    @Pattern(regexp = "[a-zA-Z ,.'-]+")
    @NotNull
    private String name;
    @Pattern(regexp = "[a-zA-Z ,.'-]+")
    @NotNull
    private String surname;
    @NotNull
    private LocalDate date;
    private Float currentBalance;
    private String mobile;
    private String street;
    private String accommodationNumber;
    private String flatNumber;
}

在Service方法中尝试通过全参构造创建User实例：

@Override
public User getUserByCredentials(String mail, String password) {
    User user = null;
    Connection connection = connectionPool.getConnection();
    try {
        PreparedStatement preparedStatement = connection.prepareStatement(GET_USER_QUERY);
        preparedStatement.setString(1, mail);
        preparedStatement.setString(2, password);
        ResultSet resultSet = preparedStatement.executeQuery();
        if (resultSet.next()) {
            user = new User(resultSet.getInt("id"), resultSet.getString("mail"), resultSet.getString("password"),
                    resultSet.getString("name"), resultSet.getString("surname"), resultSet.getDate("date").toLocalDate(),
                    resultSet.getFloat("balance"), resultSet.getString("mobile"),
                    resultSet.getString("street"), resultSet.getString("accommodation_number"),
                    resultSet.getString("flat_number"));
        }
        return user;
    } catch (SQLException e) {
        logger.warn("SQLException while getting user. Most likely request is wrong");
        return null;
    } finally {
        connectionPool.closeConnection(connection);
    }
}

报错提示不存在对应的构造方法，项目为Spring Boot，Lombok依赖版本1.18.28：

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.28</version>
    <scope>provided</scope>
</dependency>

原因分析 #

Lombok的@AllArgsConstructor默认仅生成包含子类自身字段的全参构造，不会自动包含父类字段。你传入的第一个参数是父类的id，但子类生成的构造方法里没有该参数，因此报错。另外，同时使用@AllArgsConstructor和@SuperBuilder时，低版本Lombok的注解处理逻辑可能存在冲突，加剧构造方法生成异常。

解决方案 #

方案1：手动添加包含父类字段的全参构造 #

在User类中手动编写包含父类id的全参构造：

public User(int id, String mail, String password, String name, String surname, LocalDate date, Float currentBalance, String mobile, String street, String accommodationNumber, String flatNumber) {
    super(id);
    this.mail = mail;
    this.password = password;
    this.name = name;
    this.surname = surname;
    this.date = date;
    this.currentBalance = currentBalance;
    this.mobile = mobile;
    this.street = street;
    this.accommodationNumber = accommodationNumber;
    this.flatNumber = flatNumber;
}

方案2：使用@SuperBuilder的Builder模式创建实例 #

既然已经添加@SuperBuilder注解，直接用Builder模式创建对象，天然支持父类字段赋值：

if (resultSet.next()) {
    user = User.builder()
            .id(resultSet.getInt("id"))
            .mail(resultSet.getString("mail"))
            .password(resultSet.getString("password"))
            .name(resultSet.getString("name"))
            .surname(resultSet.getString("surname"))
            .date(resultSet.getDate("date").toLocalDate())
            .currentBalance(resultSet.getFloat("balance"))
            .mobile(resultSet.getString("mobile"))
            .street(resultSet.getString("street"))
            .accommodationNumber(resultSet.getString("accommodation_number"))
            .flatNumber(resultSet.getString("flat_number"))
            .build();
}

方案3：升级Lombok版本并调整注解顺序 #

将Lombok版本升级到1.18.30及以上（该版本优化了@AllArgsConstructor与@SuperBuilder的兼容性），同时调整注解顺序，把@SuperBuilder放在@AllArgsConstructor之后：

@EqualsAndHashCode(callSuper = true)
@NoArgsConstructor
@Data
@AllArgsConstructor
@SuperBuilder
public class User extends BaseEntity{
    // 字段定义不变
}

升级后的依赖：

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.30</version>
    <scope>provided</scope>
</dependency>

重新编译项目后，Lombok会生成包含父类字段的全参构造。

额外检查项 #

• 确认IDEA已安装Lombok插件，且开启Enable annotation processing（路径：File > Settings > Build, Execution, Deployment > Compiler > Annotation Processors）
• 清理编译缓存：点击Build > Clean Project，再点击Build > Rebuild Project

内容的提问来源于stack exchange，提问作者IvanD