Problemeconnexion mon projet java a une bd sql

bonjour chers membres,
j'ai fais un exercice en java sur eclipse, et lorsque j'essaye de connecter ce projet a une base de donnees que j'avais créé en premier plusieurs message d'erreur s'affiche je ne sais pas pourquoi.
j'ai essayer de telecharger le connecteur J mais rien n'a changé.
si quelqu'un a une idée d'ou vient le probleme,priere de me repondre.
sur java j'avais fait:

public Dao() 
 {
  try
  {

   Class.forName("com.mysql.jdbc.Driver").newInstance();

   c=DriverManager.getConnection("jdbc:mysql://localhost:3306/esercito?user=root&password=root");

   carica();

  }
  catch(Exception e)
  {
   System.out.println("No DB. terminating");
   e.printStackTrace();
   System.exit(-1);
  }
 }

------------------------------------------------------------------------------------------------------------------------
apres l'execution du progroamme donne ce resultat:

No DB. terminating
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
 at java.lang.reflect.Constructor.newInstance(Unknown Source)
 at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
 at com.mysql.jdbc.Util.getInstance(Util.java:408)
 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:918)
 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:897)
 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:886)
 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860)
 at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2330)
 at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2083)
 at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:806)
 at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
 at java.lang.reflect.Constructor.newInstance(Unknown Source)
 at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
 at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:410)
 at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:328)
 at java.sql.DriverManager.getConnection(Unknown Source)
 at java.sql.DriverManager.getConnection(Unknown Source)
 at entities.Dao.<init>(Dao.java:38)
 at entities.Main.main(Main.java:8)
Caused by: java.lang.NullPointerException
 at com.mysql.jdbc.ConnectionImpl.getServerCharset(ConnectionImpl.java:2997)
 at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1934)
 at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1863)
 at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1226)
 at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2253)
 at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2284)
 ... 14 more

merci


EDIT : Ajout des balises de code