Question

spring3 mvc注解校验@NotNull不起作用，该怎么解决

Answer 1

有可能是pom导入包错误，@NotNull没有生效，没有验证，进入了数据库就会报500的错误
<!-- https://mvnrepository.com/artifact/javax.validation/validation-api -->
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.1.0.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.2.2.Final</version>
</dependency>

//创建
@RequestMapping(path = "/", method = RequestMethod.POST)
public UserDto createUser(@Valid @RequestBody UserDto userDto) {
return userService.createUser(userDto);
}

@NotNull(message="用户名不能为空")
private String nickName;

如果是生效的注解，会报400的错误

Answer 2

配置好注解扫描