[SOLVED] <s:file> doesn't retain its value when validation failed in action using Struts 2

<s:file> doesn't retain its value when validation failed in action using Struts 2

I have some fields in jsp including file field. When I submit my form, and then if validation failed for one fields, after setting it in ActionErrors, when response comes back to JSP, all fields retain their values except File field.

My Code:

<s:form autocomplete="off" action="carrier-profile" id="id_form_carrier" namespace="/usermgmt"
                enctype="multipart/form-data" method="POST">

<s:text name="txt.carrier.url"></s:text><span class="astrcs">*</span></label> <span>
                            <s:textfield type="text" name="carrier.carrierUrl" class="form-control" maxlength="255" tabindex="12"></s:textfield>


<s:file name="carrier.file" class="upload-input" id="imgInp" accept="image/*" tabindex="12"></s:file>
<s:submit/>

</s:form>

My Action Class:

public class CarrierProfileAction extends BaseSecureAction {

    private static final Logger LOG = LogManager.getLogger(CarrierProfileAction.class);

    /**
     * 
     */
    private static final long serialVersionUID = -7296331027656555878L;

    private static final String RESULT_CARRIER_SEARCH = "carrier-search";
    //  private static final String RESULT_LOGO_PREVIEW = "logo-preview";
    //  private static final String RESULT_LOGO_UPDATE = "logo-update";
    public static final String CARRIER_ID = "carrierId";
    public static final String CARRIER_ID_NBR = "carrierIdNbr";
    public static final String RECORD_MODE = "mode";

    private static final String IMAGE = "Image";

    private CarrierVO carrier = new CarrierVO();

    //  private File file;
    private Long carrierId;
    private Long carrierIdNbr;
    private Long selectedCarrier;
    private boolean imagePreviewToBeShown;
    private String mode;
    private byte[] imagePreview;

    private String userImageFileName = "";

    private boolean validImage;
    InputStream imageInputStream;


}

Above code, carrier object has all its and its fields getter setter. No issue in that. all the other fields name="carrier.xxx" are retaining except file.

Solution

You can't retain a file field due browser restriction rules. But you can use Ajax via Struts2 jQuery plugin

<%@ taglib prefix="s" uri="/struts-tags"%>
<%@ taglib prefix="sj" uri="/struts-jquery-tags"%>
<html>
  <head>
    <sj:head/>
  </head>
  <body>
    <s:form autocomplete="off" action="carrier-profile" id="id_form_carrier" namespace="/usermgmt"
                enctype="multipart/form-data" method="POST">

      <s:text name="txt.carrier.url"></s:text><span class="astrcs">*</span></label> <span>
      <s:textfield type="text" name="carrier.carrierUrl" cssClass="form-control" maxlength="255" tabindex="12"></s:textfield>
    
      <s:file name="carrier.file" cssClass="upload-input" id="imgInp" accept="image/*" tabindex="12"></s:file>

      <sj:submit value="Submit" />
    </s:form>
  </body>
</html>