org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type [si
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异常：
Caused by: org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type [simple type, class xxxxx]: can not instantiate from JSON object (need to add/enable type information?)
原因：
被转换json的类中，使用了带参数的构造方法，而忘记初始化原始构造方法，即，这个类没有了无参的初始化构造方法；
这种情况下，无法对该类进行实例化，没有办法进行toJson操作。
解决办法：
1.类中初始化默认构造方法；
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