Spring Boot验证注释@Valid和@NotBlank不起作用

下面给出的是我从中调用getPDFDetails方法的主控制器。

@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);
    }   

下面是UpdatePrintContracts类，其中我定义了带有验证注释和相应的getter / setter方法的所有变量。

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;
    }

}

我试图通过右键单击项目（运行方式）并通过肥皂UI传递变量isReprint和includeSignatureCoordinates的空白值来将应用程序作为Spring Boot应用程序运行。但是，验证似乎不起作用，并且在Soap UI上没有引发任何验证错误。我想念什么？任何帮助表示赞赏！