getting error

package org.openmrs.module.basicmodule.web.controller;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.openmrs.module.basicmodule.HL7PIXPDQService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import ca.uhn.hl7v2.HL7Exception;
import ca.uhn.hl7v2.model.Message;
import ca.uhn.hl7v2.parser.GenericParser;
import ca.uhn.hl7v2.parser.Parser;

@Controller
public class PDQResponseController {
	private String submit = null;

	/** Logger for this class and subclasses */

	protected final Log log = LogFactory.getLog(getClass());

	/** Success form view name */
	private final String SUCCESS_FORM_VIEW = "module/pixpdq/responseofpdqform.form";

	/**
	 * Initially called after the formBackingObject method to get the landing
	 * form name
	 *
	 * @return String form view name
	 */

	/**
	 * This class returns the form backing object. This can be a string, a
	 * boolean, or a normal java pojo. The bean name defined in the
	 * ModelAttribute annotation and the type can be just defined by the return
	 * type of this method
	 */



//	@Override
//	protected Map<String, Object> referenceData(HttpServletRequest req)
//			throws Exception {
//		Map<String, Object> map = new HashMap<String, Object>();
//
//		String resp;
//
//		String Message = req.getParameter("messageInput");
//
//		HL7PIXPDQService hl7serv = org.openmrs.api.context.Context
//				.getService(HL7PIXPDQService.class);
//
//		Message m3 = null;
//
//		m3 = hl7serv.processMessage(Message);
//
//		Parser p2 = new GenericParser();
//
//		resp = p2.encode(m3);
//
//		map.put("msg", resp);
//
//		return map;
//	}

	@RequestMapping(value = "module/pixpdq/responseofpdqform.form")
	public Map<String, Object> onSubmit(HttpServletRequest request) throws HL7Exception{
		Map<String, Object> map = new HashMap<String, Object>();

				String resp;

				String Message = request.getParameter("messageInput");

				HL7PIXPDQService hl7serv = org.openmrs.api.context.Context
						.getService(HL7PIXPDQService.class);

				Message m3 = null;

				m3 = hl7serv.processMessage(Message);

				Parser p2 = new GenericParser();

				resp = p2.encode(m3);

				map.put("msg", resp);

				return map;



	}
}