The API handles a faulty request without raising an error eventhough annotated with ApiModelProperty with dataType

Question

I am getting the following error - "The generated value is of the type integer instead of the type ‘string’" with 42crunch conformance scan with the following problem reported - "The API handles a faulty request without raising an error"

In the test scan, it is trying to pass the following request body -

{"type":1,"visitId":"xxxx","visitorId":"Ag5w\u0010l\u0014"}

So in above request, type is passed as integer but API is declared with type with "String" property.

  @ApiModelProperty(dataType = "java.lang.String", value = "Type", example = "Data")  
  @Pattern(regexp = "^.*$")
  @Size(min = 1, max = 50)
  private String type;

I have the above annotation for the input request class. So eventhough type property is declared with ApiModelProperty annotation with dataType accepting only "java.lang.String", why is it throwing error?

I also have the @Valid annotation for the controller endpoint method which is accepting the request body.

 public ResponseEnvelope recommendedProducts(   
          @Valid @RequestBody RecommendedProductRequest productRequest,
      HttpServletResponse httpServletResponse) {

Please let know how to resolve this. Thanks!