关于这个报错：Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException

后台报错：

Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: Could not read document: Unexpected character ('m' (code 109)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')
nested exception is com.fasterxml.jackson.core.JsonParseException: Unexpected character ('m' (code 109)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')

前端报错：

POST http://localhost:8081/xxx 400 (Bad Request)

网上说原因是后台的这个Vo类有Integer类型的属性，同时使用了注解@requsetBody，而前端传来的是null，这个会有错。
会有拆包装为int时空指针（没有明白）

我改一下前端的contentType，问题解决了。所以产生错误的原因就是上面所说的，还有其他的方法解决这个问题，
知道了是上面这个原因就是最重要的。

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关于报错：Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException

关于这个报错：Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException

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