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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*

**Step-1: Add these two dependency in the pom.xml file**

        <dependency>
			<groupId>javax.validation</groupId>
			<artifactId>validation-api</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-validation</artifactId>
		</dependency>

**Step-2: Create a Custom Exception class like this**

    package com.bjit.salon.auth.service.exceptions;


    import org.springframework.context.support.DefaultMessageSourceResolvable;
    import org.springframework.http.HttpStatus;
    import org.springframework.http.ResponseEntity;
    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 java.util.List;
    import java.util.stream.Collectors;

    @ControllerAdvice
    public class AnynameApplicationException {

        @ExceptionHandler(MethodArgumentNotValidException.class)
        @ResponseBody
        public ResponseEntity<List<String>> processUnmergeException(final 
    MethodArgumentNotValidException ex) {

            List<String> list = ex.getBindingResult().getAllErrors().stream()
                    .map(DefaultMessageSourceResolvable::getDefaultMessage)
                    .collect(Collectors.toList());

            return new ResponseEntity<>(list, HttpStatus.BAD_REQUEST);
        }
    }

**Step-3: Add @Valid annotation to the method arguments like this way**

    public ResponseEntity<?> registerAccount(@Valid @RequestBody UserRegisterDto 
          registerDto) {
           
        // rest of the codes
    }

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Spring boot validation annotations @Valid and @NotBlank not working

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