<Resource name="jdbc/sqlserv" auth="Container"
        type="javax.sql.DataSource"
        maxActive="100" maxIdle="30" maxWait="10000"
        username="demonbartek"
        password=""
        driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver"
        url="jdbc:sqlserver://DEMONSQLEXPRESS:1433;databaseName=Hardwares;integratedSecurity=true;"/>

<resource-ref>
    <description>Connection Pool</description>
    <res-ref-name>jdbc/sqlserv</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>

(...)
try {
    envContext = new InitialContext();
    Context initContext  = (Context)envContext.lookup("java:/comp/env");
    DataSource ds = (DataSource)initContext.lookup("jdbc/sqlserv");

    Connection con = ds.getConnection();

    Statement stmt = con.createStatement();
    String query = "select * from Users";
    ResultSet rs = stmt.executeQuery(query);

    while(rs.next())
    {
(...)