与 Jackson 的不可变 Lombok 注释类 [英] Immutable Lombok annotated class with Jackson

问题描述

创建类的首选方法是什么

What is the preferred way to create class that is

• 不可变
• 可以使用 Jackson 进行序列化/反序列化
• 人类可读且样板代码较少

最好，我会喜欢这样的工作:

Preferably, I would have liked something like this to work:

@Data(onConstructor = @__(@JsonCreator))

然后让所有字段成为private final.但是，这甚至无法编译(我不确定为什么).使用

and then have all fields to be private final. However, this does not even compile (and I'm not sure why). Using

@AllArgsConstructor(onConstructor = @__(@JsonCreator))

将编译但只产生

InvalidDefinitionException: No serializer found for class

推荐答案

添加ConstructorProperties:

• 创建一个 lombok.config 文件 在适当的位置:lombok.anyConstructor.addConstructorProperties = true
• 在类中添加 lombok @Value 注释以使其不可变

• Create a lombok.config file in an appropriate location with the line: lombok.anyConstructor.addConstructorProperties = true
• Add lombok @Value annotation to your class to make it immutable

然后杰克逊的序列化和反序列化按预期工作.

Then serialization and deserialization by Jackson works as expected.

这个方法:

• 符合条件
• 比上一个最佳答案的样板少
• 适用于 v1.16.20(2018 年 1 月 9 日) 及更高版本

• meets the criteria
• has less boilerplace than the previous top answer
• works on v1.16.20 (January 9th, 2018) and later

2020-08-16

• 注意:将 @Builder 与 @Value 一起使用会导致此解决方案失败.(感谢下面@guilherme-blanco 的评论.)但是，如果您还添加了例如@AllArgsConstructor 它仍然按预期工作.

• Note: Using @Builder with @Value causes this solution to fail. (Thanks to comment from @guilherme-blanco below.) However, if you also add e.g. @AllArgsConstructor it does still work as expected.

2021-08-19

• 注意:当您添加或更改 lombok.config 文件时，除非您进行重建(先清理后构建)，否则更改不会生效.我已经被这个问题吸引了好几次了.
• @Jacksonized 注释解决方案 是实现特定类所需结果的另一种方法注释.但是，我个人更喜欢不需要记住对用于反序列化的每个类进行注释.使用 lombok.config 消除了这种开销.

• Note: When you add or change a lombok.config file the change is not picked up unless you do a rebuild (clean then build). I have been caught out by this a few times.
• @Jacksonized annotation solution is another method to achieve the desired outcome for the specific classes annotated. However, I personally prefer not to need to remember to annotate every class used for deserialization. Using lombok.config removes this overhead.

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