如何在 Jackson 中禁用 fail_on_empty_beans? [英] How do I disable fail_on_empty_beans in Jackson?

问题描述

使用 jackson 2.1，如何禁用错误消息似乎要我禁用的 fail_on_empty beans?

Using jackson 2.1, how do I disable the fail_on_empty beans that the error message seems to want me to disable?

我假设这只是世界上最简单的事情，但现在已经晚了，我无法从 api 中找到简单的教程或任何特别明显的东西.序列化工厂?为什么他们要让它如此不直观，然后让错误信息看起来如此简单?

I'm assuming this is just the simplest thing in the world, but hell it is late and I haven't been able to find a simple tutorial or anything particularly obvious from the api. SerializationFactory? Why would they make it so unintuitive and then make the error message seem so straightforward?

虽然我确实喜欢错误信息，但我的意思是，它比 NPE 好.

Although I do like the error message, I mean, it is better than an NPE.

我假设有一种方法可以使用注释来做到这一点 - 但我并不热衷于将它们用于我正在做的简单工作！

I'm assuming there is a way to do this using annotations - but I'm not keen on using them at all for the simplistic work I'm doing!

推荐答案

我相信您可以按班级或全局执行此操作.

You can do this per class or globally, I believe.

对于每个类，在类声明上方尝试@JsonSerialize.

For per class, try @JsonSerialize above class declaration.

对于映射器，以下是一个示例:

For a mapper, here's one example:

ObjectMapper mapper = new ObjectMapper();
mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
// do various things, perhaps:
String someJsonString = mapper.writeValueAsString(someClassInstance);
SomeClass someClassInstance = mapper.readValue(someJsonString, SomeClass.class)

下面的 StackOverflow 链接也有一个 Spring 项目的例子.

The StackOverflow link below also has an example for a Spring project.

对于 REST with Jersey，我不记得我的头绪，但我相信它是相似的.

For REST with Jersey, I don't remember off the top off my head, but I believe it's similar.

我挖出的几个链接:(由于 Codehaus 关闭，编辑了第一个链接).

Couple of links I dug up: (edited 1st link due to Codehaus shutting down).

• https://web.archive.org/web/20150513164332/https://jira.codehaus.org/browse/JACKSON-201
• Jackson serializationConfig

这篇关于如何在 Jackson 中禁用 fail_on_empty_beans?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！