diff --git a/bin/classes/bma/groomservice/data/dataprovence/DataprovenceFileHelper.class b/bin/classes/bma/groomservice/data/dataprovence/DataprovenceFileHelper.class
index 134c6a1..a45c99a 100644
Binary files a/bin/classes/bma/groomservice/data/dataprovence/DataprovenceFileHelper.class and b/bin/classes/bma/groomservice/data/dataprovence/DataprovenceFileHelper.class differ
diff --git a/bin/classes/bma/groomservice/data/dataprovence/DataprovenceHelper.class b/bin/classes/bma/groomservice/data/dataprovence/DataprovenceHelper.class
index d83a633..78c9015 100644
Binary files a/bin/classes/bma/groomservice/data/dataprovence/DataprovenceHelper.class and b/bin/classes/bma/groomservice/data/dataprovence/DataprovenceHelper.class differ
diff --git a/bin/classes/bma/groomservice/data/dataprovence/DataprovenceManager.class b/bin/classes/bma/groomservice/data/dataprovence/DataprovenceManager.class
index 0ae3295..eb72846 100644
Binary files a/bin/classes/bma/groomservice/data/dataprovence/DataprovenceManager.class and b/bin/classes/bma/groomservice/data/dataprovence/DataprovenceManager.class differ
diff --git a/bin/dataprovence.jar b/bin/dataprovence.jar
index 05312b7..1810ca4 100644
Binary files a/bin/dataprovence.jar and b/bin/dataprovence.jar differ
diff --git a/src/bma/groomservice/data/dataprovence/DataprovenceFileHelper.java b/src/bma/groomservice/data/dataprovence/DataprovenceFileHelper.java
index c54b3df..aa694cc 100644
--- a/src/bma/groomservice/data/dataprovence/DataprovenceFileHelper.java
+++ b/src/bma/groomservice/data/dataprovence/DataprovenceFileHelper.java
@@ -40,4 +40,9 @@ public class DataprovenceFileHelper extends DataprovenceHelper {
 			}
 		}
 	}
+
+	@Override
+	public String toString() {
+		return "DataprovenceFileHelper [filename=" + filename + "]";
+	}
 }
diff --git a/src/bma/groomservice/data/dataprovence/DataprovenceHelper.java b/src/bma/groomservice/data/dataprovence/DataprovenceHelper.java
index 9e13e59..5597dff 100644
--- a/src/bma/groomservice/data/dataprovence/DataprovenceHelper.java
+++ b/src/bma/groomservice/data/dataprovence/DataprovenceHelper.java
@@ -28,6 +28,8 @@ public class DataprovenceHelper {
 
 	public DataprovenceHelper(String rootUrl, String datasetName,
 			Collection<Filter> filters) {
+		logger.debug("new DataprovenceHelper({},{},{})", new Object[] {
+				rootUrl, datasetName, filters });
 		this.rootUrl = rootUrl;
 		this.datasetName = datasetName;
 		this.filters = filters;
@@ -98,7 +100,7 @@ public class DataprovenceHelper {
 	protected PoiList getContent(InputStream is) throws IOException {
 
 		String json = readStream(is);
-		logger.debug("json={}", json);
+		// logger.debug("json={}", json);
 		Gson gson = new Gson();
 
 		PoiList all = gson.fromJson(json, PoiList.class);
@@ -148,4 +150,10 @@ public class DataprovenceHelper {
 		return Arrays.asList(gl.d);
 	}
 
+	@Override
+	public String toString() {
+		return "DataprovenceHelper [rootUrl=" + rootUrl + ", datasetName="
+				+ datasetName + ", filters=" + filters + "]";
+	}
+
 }
diff --git a/src/bma/groomservice/data/dataprovence/DataprovenceManager.java b/src/bma/groomservice/data/dataprovence/DataprovenceManager.java
index a354f02..7410400 100644
--- a/src/bma/groomservice/data/dataprovence/DataprovenceManager.java
+++ b/src/bma/groomservice/data/dataprovence/DataprovenceManager.java
@@ -59,11 +59,11 @@ public class DataprovenceManager implements PoiListener {
 				"MonumentsEtStesCulturels" });
 	}
 
-	private TreeSet<Poi> pois;
+	private final TreeSet<Poi> pois = new TreeSet<Poi>();
 
 	private final PoiListener listener;
 
-	private int count = 0;
+	// private int count = 0;
 
 	// false -> lit les données en local (fichiers *.json)
 	// true -> lit les données depuis le net
@@ -103,12 +103,13 @@ public class DataprovenceManager implements PoiListener {
 		super();
 		this.listener = listener;
 		this.online = online;
-		this.pois = new TreeSet<Poi>();
+		// this.pois = new TreeSet<Poi>();
 	}
 
 	private Collection<DataprovenceHelper> findHelpers(Collection<String> tags) {
 		ArrayList<DataprovenceHelper> helpers = new ArrayList<DataprovenceHelper>();
 		for (String tag : tags) {
+			// logger.debug("DATASETS[{}]", tag);
 			String[] datasets = DATASETS.get(tag);
 			for (int d = 0; d < datasets.length; d++) {
 				if (online) {
@@ -124,33 +125,27 @@ public class DataprovenceManager implements PoiListener {
 
 	@Override
 	public void onPoiReceived(List<Poi> pois) {
-		synchronized (this) {
-			this.pois.addAll(pois);
-			count--;
-			// quand on a recu toutes les reponses, on notifie le listener
-			// ("externe")
-			if (count == 0) {
-				listener.onPoiReceived(new ArrayList<Poi>(this.pois));
-			}
-		}
+		logger.debug("onPoiReceived({})", pois.size());
+		// synchronized (pois) {
+		this.pois.addAll(pois);
+		// }
+		listener.onPoiReceived(new ArrayList<Poi>(pois));
 	}
 
 	public void findAll(Collection<String> tags) {
 
-		synchronized (this) {
-			count = 0;
-			pois = new TreeSet<Poi>();
-		}
+		// synchronized (pois) {
+		pois.clear();
+		// }
 
 		Set<DataprovenceHelper> helpers = new HashSet<DataprovenceHelper>();
 		helpers.addAll(findHelpers(tags));
 
 		// lance une AsyncTask pour chaque helper
 		for (DataprovenceHelper helper : findHelpers(tags)) {
-			synchronized (this) {
-				count++;
-				new LoadDataTask(this).execute(helper);
-			}
+			logger.debug("loadData(" + helper + ")");
+			new LoadDataTask(this).executeOnExecutor(
+					AsyncTask.THREAD_POOL_EXECUTOR, helper);
 		}
 	}