java - database is not connected after tomcat restart it require reload project -

i have struts2 web application runs on sub domain http://www.abc.example.com.

when tomcat restart, domain , sub-domains started , connected database 1 struts2 application runs on http://www.abc.example.com not connected database till application not reloaded again tomcat manager. using phpmyadmin database , using jdbc connectivity connect that.

my database connection class is-

import java.util.hashmap; import java.sql.connection;  import java.util.map;  import javax.sql.datasource;  import com.mysql.jdbc.jdbc2.optional.mysqldatasource;  public class connectionresource  { public static map<string, datasource> sessionmap=new hashmap<string, datasource>();   private static string driver = "com.mysql.jdbc.driver";    private static string port = "3306";  private static connection connection = null;       private static string ip = "localhost";     private static string user = "root";       private static string password = "123456";      private static mysqldatasource  datasource=null;       /**            * @return ip  */  public static string getip() {     return ip;    }   /**  * @param ip ip set  */  public static void setip(string ip) {     connectionresource.ip = ip;  }   /**  * @return user  */  public static string getuser() {     return user;  }   /**  * @param user user set  */  public static void setuser(string user) {     connectionresource.user = user;  }   /**  * @return password  */  public static string getpassword() {      return password;  }  /**  * @param password password set */ public static void setpassword(string password) {     connectionresource.password = password; }  private static datasource createdatasource(string db) throws exception{     string url="jdbc:mysql://"+ip+":"+port+"/"+db+"";     datasource = new mysqldatasource();     datasource.seturl(url);     datasource.setuser(user);     datasource.setpassword(password);             return datasource; }  public static connection getconnection(string db){      try{         if(sessionmap.get(db)!=null){             return  sessionmap.get(db).getconnection();              }else{              datasource ds=createdatasource(db);              sessionmap.put(db, ds);              return ds.getconnection();          }      }catch(exception e){         e.printstacktrace();     }     return null; }    } 

what problem?

according mention feel not deploy. please mention more details correct problem have.