Interpretation d'erreur dans une servlet

**hardokin** · 29/08/2008, 14h13

Bonjour j'ai cette erreur :

Code :

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java.lang.IllegalStateException: Impossible d'utiliser faire-suivre (forward) après que la réponse ait été envoyée
	fonctions.emprunts.doPost(emprunts.java:73)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

Et voici la servlet avec le fameux doPost qui ne va pas...:

Code :

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package fonctions;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

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/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);
		doPost( 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> abonne() throws Ca_chie{
    
		List<MdAbonnes> liste= new ArrayList<MdAbonnes>();
		List<String> lstr= new ArrayList<String>();
		for (MdAbonnes a : liste)
		   lstr.add(a.getNom());

    return lstr;
	}
    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;
    }
}