Erreur "java.lang.NullPointerException" SQL serveur ResultSet

Bonjour,

J'ai un soucis sur un logiciel que je développe au travail.
Voici le code erreur :

Code:

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Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at Design.RecupEtallonnage(Design.java:289)
	at Design.InsertionReleveBDD(Design.java:271)
	at Design$2.actionPerformed(Design.java:107)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$200(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

La ligne où pose le soucis est

Code:

ResultSet rs=bdd.ExecuterRequeteLecture(requete);

Voici ma classe : BDD

Code:

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public class BDD {
 
	public Connection con;
 
	public BDD(String chaineConnexion) throws ClassNotFoundException, InstantiationException, IllegalAccessException
	{
		try{
	        String url = chaineConnexion;
	        Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
	        con = DriverManager.getConnection(url);
	        if(con != null)
	        {
	        	javax.swing.JOptionPane.showMessageDialog(null, "Connexion Réussie");
	        }
	        else
	        {
	        	javax.swing.JOptionPane.showMessageDialog(null, "Connexion echoué");
	        }
 
	    } catch(SQLException se){
	        System.out.println("SQL exception: " + se.getMessage());
	    }
 
	}
 
	public ResultSet ExecuterRequeteLecture(String requete)
	{
		try{
		    Statement stmt = con.createStatement();
		    ResultSet rs = stmt.executeQuery(requete);
		    System.out.println(rs.toString());
		    return rs;
		} catch(SQLException se){
		    System.out.println("SQL exception: " + se.getMessage());
		    return null;
		}
	}
 
	public boolean ExecuterRequeteInsert(String requete)
	{
		try{
			Statement stmt = con.createStatement();
			return stmt.execute(requete);
		}
		catch( SQLException se)
		{
			System.out.println("SQL exception : " +se.getMessage());
			return false;
		}
	}
 
}

Ma requête est bonne et la connexion à BDD est bien ouverte. Je ne comprend pas pourquoi RS serait null

Merci d'avance pour votre aide précieuse