@Validate注解不生效【依赖冲突问题】

问题源码

@PostMapping("/save")
public Result save(@Validated @RequestBody User user){
    return Result.success(user);
}

首先，字段前面要用@Valid而不是@Validated，而且应该在@Valid字段后紧跟一个BindingResult接收返回

因此正确的Controller代码如下

@PostMapping("/save")
public Result save(@RequestBody @Valid User user, BindingResult bindingResult){
    if(bindingResult.hasErrors()){
        System.out.println(bindingResult.getFieldError().getDefaultMessage());
    }
    return Result.success(user);
}

其次，在Bean实体类中应该用@NotBlank在String类型上而非@NotNull【基本数据类型】或@NotEmpty【集合】。

而且引用的包应该是

import org.hibernate.validator.constraints.NotBlank;

而非import javax.validation.constraints.NotBlank;

新版SpringBootStarter里没有自动注入这个依赖

    org.hibernate.validator
    hibernate-validator
    6.1.7.Final

但是会报错说依赖冲突

Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:

    javax.el.ELManager.getexpressionFactory(ELManager.java:38)

The following method did not exist:

    javax.el.ELUtil.getexpressionFactory()Ljavax/el/expressionFactory;

The method's class, javax.el.ELUtil, is available from the following locations:

    jar:file:/wlfullclient.jar!/javax/el/ELUtil.class

    jar:file:/micoservice/apache-maven-3.6.3/repository/org/glassfish/jakarta.el/3.0.3/jakarta.el-3.0.3.jar!/javax/el/ELUtil.class

The class hierarchy was loaded from the following locations:

    javax.el.ELUtil: file:/src/main/resources/lib/wlfullclient.jar

Action:

Correct the classpath of your application so that it contains a single, compatible version of javax.el.ELUtil

Process finished with exit code 1

这情况99%是依赖冲突了，去
下面找找所有和el有关的，发现有一个带el且点开后发现包含了javax.el，把这个包
直接Open Library Settings在里面删除即可。【注意，不是图片里这个依赖！自己去找哪个带了javax.el我的当时已经删除了】