错误：Cannot construct instance of `xxxx` (no Creators, like default construct , exist): cannot .......

查了很多资料，实体类缺少无参构造

给实体类添加注解

@NoArgsConstructor  //无参构造
@AllArgsConstructor  //有参构造

当然，添加该注解之前在pom文件里添加依赖

<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId>
</dependency>

如果还是不行，按顺序执行下面三步

添加注解后一直未起作用，重新打包之后就可以了！

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错误：Cannot construct instance of `xxxx` (no Creators, like default construct , exist): cannot .......

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