コネクションプールの設定エラーについて

Servletでコネクションプールを使うための記述をしてみたのですが、
６９行目の「conn = ds.getConnection();」で下記のようなエラーが出てしまいました。
「The method getConnection() is undefined for the type DataSource」

エラーを消すためにquick fixを試してみたり、
最初にdsを定義している２４行目の「DataSource ds;」の書き方に問題が無いか再度確認してみたのですが、
原因が掴めていません。

ご助力のほど、よろしくお願い致します。

package info.searchman.lesson.java_mysql;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import javax.activation.DataSource;
import javax.naming.InitialContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class SearchServlet extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	
	
	DataSource ds;

		
		public void init() throws ServletException {
			try {
				
				InitialContext ic = new InitialContext();
				
				ds = (DataSource) ic.lookup("java:comp/env/jdbc/searchman");
			} catch (Exception e) {

			}
		}

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		// initial settings of DB
		Connection conn = null;
		PreparedStatement pstmt = null;
		ResultSet rset = null;

		// setting text code
		request.setCharacterEncoding("Windows-31J");

		// get the name in index.jsp
		String name = request.getParameter("name");

		// get the id in index.jsp
		String id = request.getParameter("id");

		// get the sei in index.jsp
		String sei = request.getParameter("sei");

		// get the nen in index.jsp
		String nen = request.getParameter("nen");
		
	
		try {
			// register JDBC Driver
//			Class.forName("com.mysql.jdbc.Driver");
//			// creating Connection
//			conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/company_db?serverTimezone=UTC&useSSL=false",
//					"suser", "spass");
			
			conn = ds.getConnection();

			// preparing for creating sql
			StringBuffer sql = new StringBuffer();

			// creating sql from name
			sql.append("select id, name, sei, nen, address from shain_table where name like '%");
			sql.append(name + "%'");

			// if id is selected, add it
			if (id != "") {
				sql.append("and id ='" + id + "'");
			}

			// if sei is selected, add it
			if (sei != "") {
				sql.append("and sei ='" + sei + "'");
			}

			// if nen is selected, add it
			if (nen != "") {
				sql.append("and nen ='" + nen + "'");
			}

			// display sql
			System.out.println(sql);

			// display sql sentence
			pstmt = conn.prepareStatement(new String(sql));

			// execute sql
			pstmt.execute();

			// put the executed result into ResultSet class
			rset = pstmt.executeQuery();

			// transfer the data to the transition page(put it by Attribute)
			request.setAttribute("kekka", rset);

			// move on to search.jsp
			request.getRequestDispatcher("/search.jsp").forward(request, response);

			// terminate the used objects
			rset.close();
			pstmt.close();
			conn.close();

		} catch (Exception e) {
			e.printStackTrace();
			
			String status ="Seearch is failed. Please contact the system manager";					
			request.setAttribute("status", status);
			request.getRequestDispatcher("/result.jsp").forward(request, response);

		} finally {
			try {
				// just in case, terminate the DB connection with finally statement
				conn.close();
			} catch (Exception e) {
			}
		}

	}

}