解決方法：
方法1：將bean目錄下的實體類屬性由private改為public（不推薦）；
方法2：給實體類屬性設置setter和getter方法（推薦使用）。
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No serializer found for class com.hy.myapp.rest.VarietyInfo and no properties discovered to create BeanSerializer
No serializer found for class org.springframework.context.expression.StandardBeanExpressionResolver and no properties discovered to create BeanSerializer
【實體 報錯 】No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer
No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer
Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.apache.catalina.connector.CoyoteWriter and no properties discovered to create BeanSerializer
Could not write content: No serializer found for class and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) )
org.apache.ibatis.executor.loader.javassist.JavassistProxyFactory$EnhancedResultObjectProxyImpl and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.
解決：Could not write JSON: No serializer found for class *** and no properties錯誤
java.lang.IllegalArgumentException: No converter found for return value of type: class com.st.bean.User
com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class