原實體類代碼

@EqualsAndHashCode(callSuper = true)
@Data
public class Pojo extends BaseBean {private static final long serialVersionUID = -4291335073882689552L;@ApiModelProperty("")private Integer id;......private List<Item> list;@AllArgsConstructor@Datapublic static class Item{......}
}

報錯信息

org.springframework.beans.InvalidPropertyException: Invalid property 'list[0]' of bean class [com.xx.PoJo]: Illegal attempt to get property 'list' threw exception; nested exception is org.springframework.beans.NullValueInNestedPathException: Invalid property 'list' of bean class [com.xx.PoJo]: Could not instantiate property type [com.xx.PoJo$Item] to auto-grow nested property path; nested exception is java.lang.NoSuchMethodException: com.xx.PoJo$Item.<init>()at org.springframework.beans.AbstractNestablePropertyAccessor.getPropertyValue(AbstractNestablePropertyAccessor.java:712)at org.springframework.beans.AbstractNestablePropertyAccessor.getNestedPropertyAccessor(AbstractNestablePropertyAccessor.java:843)at org.springframework.beans.AbstractNestablePropertyAccessor.getPropertyAccessorForPropertyPath(AbstractNestablePropertyAccessor.java:820)at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:256)at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:104)at org.springframework.validation.DataBinder.applyPropertyValues(DataBinder.java:889)at org.springframework.validation.DataBinder.doBind(DataBinder.java:780)at org.springframework.web.bind.WebDataBinder.doBind(WebDataBinder.java:207)at org.springframework.web.bind.ServletRequestDataBinder.bind(ServletRequestDataBinder.java:129)
......
Caused by: org.springframework.beans.NullValueInNestedPathException: Invalid property 'list' of bean class [com.xx.PoJo]: Could not instantiate property type [com.xx.PoJo] to auto-grow nested property path; nested exception is java.lang.NoSuchMethodException: com.xx.PoJo$Item.<init>()at org.springframework.beans.AbstractNestablePropertyAccessor.newValue(AbstractNestablePropertyAccessor.java:923)at org.springframework.beans.AbstractNestablePropertyAccessor.growCollectionIfNecessary(AbstractNestablePropertyAccessor.java:790)at org.springframework.beans.AbstractNestablePropertyAccessor.getPropertyValue(AbstractNestablePropertyAccessor.java:659)... 57 common frames omitted
Caused by: java.lang.NoSuchMethodException: com.senshun.pay.bus.model.FuiouCloseUserNotify$BankItem.<init>()at java.base/java.lang.Class.getConstructor0(Class.java:3349)at java.base/java.lang.Class.getDeclaredConstructor(Class.java:2553)at org.springframework.beans.AbstractNestablePropertyAccessor.newValue(AbstractNestablePropertyAccessor.java:914)... 59 common frames omitted
10:03:40.648 [http-nio-8904-exec-10] WARN  o.s.w.s.m.m.a.ExceptionHandlerExceptionResolver - Resolved [org.springframework.beans.InvalidPropertyException: Invalid property 'list[0]' of bean class [com.xx.PoJo]: Illegal attempt to get property 'list' threw exception; nested exception is org.springframework.beans.NullValueInNestedPathException: Invalid property 'list' of bean class [com.xx.PoJo]: Could not instantiate property type [com.xx.PoJo$Item] to auto-grow nested property path; nested exception is java.lang.NoSuchMethodException: com.xx.PoJo$Item.<init>()]

原因及解決辦法

com.xx.PoJo$Item.<init>()

意思就是實體類Pojo中Item實體類沒有無參構造方法。

在Item實體類添加上無參構造方法或者加上@NoArgsConstructor注解即可。

@EqualsAndHashCode(callSuper = true)
@Data
public class Pojo extends BaseBean {private static final long serialVersionUID = -4291335073882689552L;@ApiModelProperty("")private Integer id;......private List<Item> list;@NoArgsConstructor    //加上這個注解@AllArgsConstructor@Datapublic static class Item{......}
}

?