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Spring boot validation annotations @Valid and @NotBlank not working

Given below is my main controller from which I am calling the getPDFDetails method.

@RequestMapping(value=PATH_PRINT_CONTRACTS, method=RequestMethod.POST)
    public ResponseEntity<?> printContracts(@RequestBody final UpdatePrintContracts updatePrintContracts) throws Exception {
    
        System.out.println("contracts value is "+ updatePrintContracts);
        
        Integer cancellationReasons = service.getPDFDetails(updatePrintContracts);
        
        System.out.println("success!");
        
        return ResponseEntity.ok(cancellationReasons);
    }

Below is the UpdatePrintContracts class where I have defined all the variables with validation annotations and corresponding getter/setter methods.

public class UpdatePrintContracts {
    
    @Valid
    @NotBlank
    @Pattern(regexp = "\\p{Alnum}{1,30}")
    String isReprint;
    
    @Valid
    @NotBlank
    Integer dealerId;
    
    @Valid
    @NotBlank
    @Pattern(regexp = "\\p{Alnum}{1,30}")
    String includeSignatureCoordinates;
    
    @Valid
    @NotBlank
    java.util.List<Integer> contractNumbers;

    public String getIsReprint() {
        return isReprint;
    }

    public void setIsReprint(String isReprint) {
        this.isReprint = isReprint;
    }

    public Integer getDealerId() {
        return dealerId;
    }

    public void setDealerId(Integer dealerId) {
        this.dealerId = dealerId;
    }

    public String getIncludeSignatureCoordinates() {
        return includeSignatureCoordinates;
    }

    public void setIncludeSignatureCoordinates(String includeSignatureCoordinates) {
        this.includeSignatureCoordinates = includeSignatureCoordinates;
    }

    public java.util.List<Integer> getContractNumbers() {
        return contractNumbers;
    }

    public void setContractNumbers(java.util.List<Integer> contractNumbers) {
        this.contractNumbers = contractNumbers;
    }
    
}

I am trying to run the application as a Spring Boot app by right clicking on the project (Run As) and passing blank values for variables isReprint and includeSignatureCoordinates through Soap UI. However the validation doesn't seem to work and is not throwing any validation error in Soap UI. What am I missing? Any help is appreciated!

Answer*

* This answer is in <h1><B>kotlin</B></h1> you can also refer this for java syntext is highly similar
* Create a exception handler 
* <B>Tip</b>: check console for exception class 
to log error message in console add this line to <B>application.properties</B>
```kotlin
server.error.include-message =  always
```
```kotlin 
import org.springframework.http.HttpStatus
import org.springframework.http.ResponseEntity
import org.springframework.stereotype.Component
import org.springframework.validation.FieldError
import org.springframework.validation.ObjectError
import org.springframework.web.bind.MethodArgumentNotValidException
import org.springframework.web.bind.annotation.ControllerAdvice
import org.springframework.web.bind.annotation.ExceptionHandler
import org.springframework.web.bind.annotation.ResponseBody
import org.springframework.web.bind.annotation.ResponseStatus
import java.util.function.Consumer

@ControllerAdvice
class MethodArgumentNotValidExceptionHandler {
    @ExceptionHandler(MethodArgumentNotValidException::class)
    @ResponseBody
    fun handleValidationExceptions(ex: MethodArgumentNotValidException): ResponseEntity<Map<String, String?>> {
        val errors: MutableMap<String, String?> = HashMap()
        ex.bindingResult.allErrors.forEach(Consumer { error: ObjectError ->
            val fieldName = (error as FieldError).field
            val errorMessage = error.getDefaultMessage()
            errors[fieldName] = errorMessage
        })
        println(errors)
        return ResponseEntity.badRequest().body(errors)
    }
}

```
* use jakarta validation instead of java x in am using spring 3+
```groove
    implementation ("org.springframework.boot:spring-boot-starter-validation")
```

* if your are using kotlin target annotation to fields
```kotlin
import jakarta.persistence.*
import jakarta.validation.constraints.Email
import jakarta.validation.constraints.NotBlank
import jakarta.validation.constraints.Pattern
import org.springframework.security.core.GrantedAuthority
import org.springframework.security.core.authority.SimpleGrantedAuthority
import org.springframework.security.core.userdetails.UserDetails

@Entity
@Table(name = "_user")
data class User(
    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
    var id: Int? = null,
    @field:NotBlank var firstName: String = "",
    @field:NotBlank var lastName: String = "",
    @field:Email @Column(unique = true) var email: String = "",
    @field:Column(unique = true, name = "password")
    @field:NotBlank private var _password: String = "",
) 
```
* in your router class use @Validated annotation
```kotiln
import jakarta.validation.Valid
```
```kotlin

    @PostMapping("/login")
    fun login(
        @Validated @RequestBody reqBody: User,
    ): ResponseEntity<String>? {
        return ResponseEntity.ok(
            accountService.login(
                email = reqBody.email,
                password = reqBody.password
            ).bind()
        )
        
    }
```

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Spring boot validation annotations @Valid and @NotBlank not working

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