java springboot validate request parameters springboot @Valid annotation is invalid-CodePudding

Adding @NotBlank annotation to member variables in DTO does not take effect. What is the reason? Please help me

CodePudding user response：

first check this dependency is present in the pom.xml file. If it doesn't present then add. With dependency present in your project now use can use @NotBlack and @Valid annotation.

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency> 
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency> 
<dependency> 
    <groupId>com.h2database</groupId> 
    <artifactId>h2</artifactId>
    <version>1.4.197</version> 
    <scope>runtime</scope>
</dependency>
<dependency> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-validation</artifactId> 
</dependency>

For more information about Validation in Spring Boot check this link

CodePudding user response：

Apart from including spring-boot-starter-validation in dependency, you must include @Valid annotation on @RequestBody in the controller for @NotBlank annotation to apply on member variables in DTO .