no suitable constructor found, can not deserialize from Object value (missing default constructor or

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spring cloud 运行中，启动了provider，再启动了consumer，然后在consumer中向provider发送请求报错：

2017-04-27 09:34:23.234 WARN 2176 --- [nio-7900-exec-1] .w.s.m.s.DefaultHandlerExceptionResolver : Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: Could not read document: Can not construct instance of com.sino.cloud.entity.User: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?)
at [Source: java.io.PushbackInputStream@5f26848a; line: 1, column: 3] (through reference chain: java.lang.Object[][0]);

这个错误的起源是因为我做测试，没有使用数据库，在findAll()方法里直接循环new的user对象，所以报错找不到合适的user对象的构造，这是检查我的user类中，我是有含参构造，然后由于错误是400，所以我加入了无参构造，都加，然后重新运行请求，正常！

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