Bonjour,
Cette erreur est générée dans le servlet dans la méthode findMatches--> String choice : abonne()
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package fonctions;
 
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Vector;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import modeles.MdAbonnes;
import exception.Ca_chie;
 
/**
 * Servlet implementation class emprunts
 */
public class emprunts extends HttpServlet {
	private static final long serialVersionUID = 1L;
 
	public static final String KEY_VALUE = "value";
    public static final String KEY_DELAY = "delay";
 
    public static final String VAR_LIST = "list";
 
    public static final String VIEW_RESOURCE =
            "/biblio/unordered-list.jsp";
    /**
     * @see HttpServlet#HttpServlet()
     */
    public emprunts() {
        super();
        // TODO Auto-generated constructor stub
    }
 
	/**
         * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
         */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		super.doGet(request, response);
	}
 
	/**
         * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
         */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		super.doPost(request, response);
		try{
		//
        // If a delay was requested, cause the delay to occur
        //
        if (request.getParameter( KEY_DELAY ) != null) {
            delay(request.getParameter( KEY_DELAY ));
        }
        //
        // Get the passed prefix and obtain the list of matches
        //
        String prefix = request.getParameter( KEY_VALUE );
        List<String> matches = findMatches( prefix );
        //
        // Set the matches as a scoped variable on the request
        // and shuffle off to the JSP
        //
        request.setAttribute( VAR_LIST, matches );
        request.getRequestDispatcher( VIEW_RESOURCE  )
            .forward( request, response );}catch(Ca_chie e) {
				try {
 
 
					request.setAttribute("message", e.toString());
 
					getServletContext().getRequestDispatcher("/erreur.jsp").forward(request,response);
 
				} catch (ServletException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
			} catch (ServletException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
 
	private void delay( String delayValue ) {
        try {
            Thread.sleep( Integer.parseInt( delayValue ) );
        }
        catch (Exception e) {
            //On failure, perform no delay
        }
    }
 
    private List<String> findMatches( String prefix ) throws Ca_chie {
 
 
    	List<String> matches = new ArrayList<String>();
        for (String choice : abonne()) {
            if (choice.startsWith( prefix )) matches.add( choice );
        }
        return matches;
    }
 
    private String abonne() throws Ca_chie{
 
    	MdAbonnes abo= new MdAbonnes();
    	Vector<Vector<String>> vect = new Vector<Vector<String>>();
    	vect.add(abo.affabo());
    	String str = vect.toString();
       	return str;
    }
}
Je dois faire en sorte de prendre le Vector<Vector<String>> et de le mettre dans la boite String Choice...
Pouvez vous m'aider?