java.lang.IllegalArgumentException：找不到类型返回值的转换器 [英] java.lang.IllegalArgumentException: No converter found for return value of type

问题描述

使用此代码

@RequestMapping(value = "/bar/foo", method = RequestMethod.GET)
    public ResponseEntity<foo> foo() {

        Foo model;
        ...
        return ResponseEntity.ok(model);
    }
}

我收到以下异常

java.lang.IllegalArgumentException: No converter found for return value of type

我的猜测是，由于杰克逊失踪，该对象无法转换为JSON。我不明白为什么，因为我认为杰克逊是用弹簧靴内置的。

My guess is that the object cannot be converted to JSON because Jackson is missing. I don't understand why because I thought that Jackson was built in with spring boot.

然后我试图将Jackson添加到pom.xml但我还是有相同的错误

Then I have tried to add Jackson to the pom.xml but I still have the same error

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.4.3</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.4.3</version>
</dependency>

我是否必须更改任何弹簧启动属性才能使其正常工作？

Do I have to change any spring boot properties to make this work?

谢谢

推荐答案

问题是Foo中的一个嵌套对象没有任何 getter / setter

The problem was that one of the nested objects in Foo didn't have any getter/setter

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