解決：cannot deserialize from Object value (no delegate- or property-based Creator)

前因后果：
前兩天在寫一個簡單頁面的時候，前端通過ajax請求發送參數，后端創建了一個實體類用來接收參數，這個實體類添加了Lombok的@Data注解，沒有創建其他構造函數，當前端發送請求時后端控制臺就會拋出以下異常，后經過查詢發現原來是因為實體類沒有無參構造函數造成的。

解決方式：
手動創建一個無參構造器或者添加Lombok注解@NoArgsConstructor即可。

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class com.thunisoft.commons.cryptoonline.bean.ParamBean]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.thunisoft.commons.cryptoonline.bean.ParamBean` (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator)at [Source: (PushbackInputStream); line: 1, column: 2]] with root causecom.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.thunisoft.commons.cryptoonline.bean.ParamBean` (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator)at [Source: (PushbackInputStream); line: 1, column: 2]

總結

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