Lombok @Builder和JPA默认构造函数

更新

根据反馈和John的回答，我已更新了不再使用

@Tolerate

@Data

@Getter

@Setter

@NoArgsConstructor

@AllArgsConstructor

因为您想使用构建器模式，所以我想您想限制构造函数和mutators方法的可见性。为此，我们

packageprivate

access

@NoArgsConstructor``@AllArgsConstructor``value``@Setter

重要

记住要正确重写

toString

equals

hashCode

• 最佳的实现方式，将哈希码和字符串与jpa并休眠
• 如何使用jpa实体标识符实现等于和哈希码
• 休眠事实等于哈希码

    package com.stackoverflow.SO34299054;    import static org.junit.Assert.*;    import java.util.Random;    import javax.persistence.Entity;    import javax.persistence.GeneratedValue;    import javax.persistence.GenerationType;    import javax.persistence.Id;    import org.junit.Test;    import lombok.AccessLevel;    import lombok.AllArgsConstructor;    import lombok.Builder;    import lombok.Getter;    import lombok.NoArgsConstructor;    import lombok.Setter;    @SuppressWarnings("javadoc")    public class Answer {        @Entity        @Builder(toBuilder = true)        @AllArgsConstructor(access = AccessLevel.PACKAGE)        @NoArgsConstructor(access = AccessLevel.PACKAGE)        @Setter(value = AccessLevel.PACKAGE)        @Getter        public static class Person { @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id;         }                @Test        public void testPersonBuilder() { final Long expectedId = new Random().nextLong(); final Person fromBuilder = Person.builder()     .id(expectedId)     .build(); assertEquals(expectedId, fromBuilder.getId());        }                @Test        public void testPersonConstructor() { final Long expectedId = new Random().nextLong(); final Person fromNoArgConstructor = new Person(); fromNoArgConstructor.setId(expectedId); assertEquals(expectedId, fromNoArgConstructor.getId());        }    }

旧版本使用

@Tolerate

@Data

使用

@Tolerate

因为您想使用构建器模式，所以我想您想控制setter方法的可见性。

该

@Data

public

@Setter(value =AccessLevel.PROTECTED)

protected

记住要正确重写

toString

equals

hashCode

• 最佳的实现方式，将哈希码和字符串与jpa并休眠
• 如何使用jpa实体标识符实现等于和哈希码
• 休眠事实等于哈希码

    package lombok.javac.handlers.stackoverflow;    import static org.junit.Assert.*;    import java.util.Random;    import javax.persistence.GenerationType;    import javax.persistence.GeneratedValue;    import javax.persistence.Id;    import lombok.AccessLevel;    import lombok.Builder;    import lombok.Data;    import lombok.Setter;    import lombok.experimental.Tolerate;    import org.junit.Test;    public class So34241718 {        @Builder        @Data        public static class Person { @Id @GeneratedValue(strategy = GenerationType.AUTO) @Setter(value = AccessLevel.PROTECTED) Long id; @Tolerate Person() {}        }        @Test        public void testPersonBuilder() { Long expectedId = new Random().nextLong(); final Person fromBuilder = Person.builder()     .id(expectedId)     .build(); assertEquals(expectedId, fromBuilder.getId());        }        @Test        public void testPersonConstructor() { Long expectedId = new Random().nextLong(); final Person fromNoArgConstructor = new Person(); fromNoArgConstructor .setId(expectedId); assertEquals(expectedId, fromNoArgConstructor.getId());        }    }