Spring MVC映射Guava Multimap [英] Spring MVC mapping Guava Multimap

问题描述

我的控制器无法映射来自前端的Google Guava Multimap.我从Javascript发送了这个对象:

My controller can't map a Google Guava Multimap coming from the frontend. I send from my Javascript this object:

{1:[true,false], 2:[false,true], ...}. 

如果我使用标准

java.util.Map<Long, List<Boolean>> 

一切正常.但番石榴Multimap则不行.我是否必须配置Spring以使用某些自定义转换器，还是有什么问题?

everything works fine. But not with the Guava Multimap. Do I have to configure Spring to use some custom converter, or what is the problem?

控制器为:

@RequestMapping(path = "/myurl", method = RequestMethod.POST, produces = CotrollerKonstanten.JSON_UTF8)
public long myMethod(@RequestBody MappingDto mappingDto) {
  //...
}

我的例外是:

org.springframework.http.converter.HttpMessageNotReadableException: Could not read document: 
  Can not construct instance of com.google.common.collect.Multimap, problem:
  abstract types either need to be mapped to concrete types, have custom deserializer, or be instantiated with additional type information
at [Source: java.io.PushbackInputStream@4b9c2db; line: 1, column: 13] (through reference chain: ...myClass); 
nested exception is com.fasterxml.jackson.databind.JsonMappingException: 
  Can not construct instance of com.google.common.collect.Multimap, problem: abstract types either need to be mapped to concrete types, have custom deserializer, or be instantiated with additional type information

推荐答案

您

Did you register the Guava module? By default, Jackson (and hence Spring) does not support serializing or deserializing to Guava datatypes.

Guava模块可能对您有用，也可能不起作用，这取决于您想要实现Multimap的方式-并非所有数据类型都得到实现.

The Guava module may or may not work for you depending on what implementation of Multimap you want -- not all datatypes are implemented.

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