MessageBodyWriter not found for media type=application/json

org.glassfish.jersey.message.internal.WriterInterceptorExecutor: MessageBodyWriter not found for media type=application/json, type=class xxxxx

搜索了解决方式两三天，网上的方案都不能解决，后来在不断浏览帖子时，看到这个帖子：
https://stackoverflow.com/questions/26207252/messagebodywriter-not-found-for-media-type-application-json/33756603#33756603
的其中一个评论：

即先调用Gson().toJson(); 把对象转换成jsonString，然后使用这个jsonString即可，这样就不用给jersey框架转递实体类的对象了，传递的是一个字符串。

参考：
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