diff --git a/gs-reactor/src/main/java/org/genericsystem/reactor/appserver/ApplicationServer.java b/gs-reactor/src/main/java/org/genericsystem/reactor/appserver/ApplicationServer.java
index cce64dfb3..7c04428e5 100644
--- a/gs-reactor/src/main/java/org/genericsystem/reactor/appserver/ApplicationServer.java
+++ b/gs-reactor/src/main/java/org/genericsystem/reactor/appserver/ApplicationServer.java
@@ -18,6 +18,7 @@
 import org.genericsystem.kernel.Cache;
 import org.genericsystem.reactor.HtmlDomNode;
 import org.genericsystem.reactor.HtmlDomNode.RootHtmlDomNode;
+import org.genericsystem.reactor.RootTag;
 import org.genericsystem.reactor.appserver.WebAppsConfig.SimpleWebAppConfig;
 import org.genericsystem.reactor.gscomponents.RootTagImpl;
 
@@ -83,6 +84,7 @@ private static class DomNodeVerticle extends AbstractVerticle {
 		private Cache cache;
 		private ServerWebSocket socket;
 		private PersistentApplication application;
+		private RootTag tagTree;
 		private RootHtmlDomNode rootHtmlDomNode;
 
 		DomNodeVerticle(Cache cache, ServerWebSocket socket, PersistentApplication application) {
@@ -94,7 +96,18 @@ private static class DomNodeVerticle extends AbstractVerticle {
 		@Override
 		public void start(Future<Void> startFuture) {
 			GSVertx.vertx().getVertx().executeBlocking(future -> {
-				RootHtmlDomNode result = cache.safeSupply(() -> application.init(s -> socket.writeFinalTextFrame(s)));
+				try {
+					tagTree = (RootTag) application.getApplicationClass().newInstance().initTree();
+				} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | SecurityException e) {
+					try {
+						cache.start();
+						tagTree = (RootTag) application.getApplicationClass().getConstructor(Root.class).newInstance(application.getEngine()).initTree();
+						cache.flush();
+					} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | SecurityException | InvocationTargetException | NoSuchMethodException ex) {
+						throw new IllegalStateException(ex);
+					}
+				}
+				RootHtmlDomNode result = cache.safeSupply(() -> application.init(s -> socket.writeFinalTextFrame(s), tagTree));
 				future.complete(result);
 			}, res -> {
 				if (res.succeeded())
diff --git a/gs-reactor/src/main/java/org/genericsystem/reactor/appserver/PersistentApplication.java b/gs-reactor/src/main/java/org/genericsystem/reactor/appserver/PersistentApplication.java
index 0a8590fbf..0e1e5b8c4 100644
--- a/gs-reactor/src/main/java/org/genericsystem/reactor/appserver/PersistentApplication.java
+++ b/gs-reactor/src/main/java/org/genericsystem/reactor/appserver/PersistentApplication.java
@@ -15,7 +15,6 @@
 public class PersistentApplication {
 
 	private final Class<? extends RootTag> htmlAppClass;
-	private RootTag tagTree;
 	private final Root engine;
 	private final Class<Context> modelClass;
 	private final String rootId;
@@ -40,17 +39,6 @@ public PersistentApplication(Class<? extends RootTag> htmlAppClass, Class<Contex
 			cache.safeConsum(unused -> runner.run(getEngine()));
 			log.info("Script has run");
 		}
-		try {
-			tagTree = (RootTag) getApplicationClass().newInstance().initTree();
-		} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | SecurityException e) {
-			try {
-				engine.newCache().start();
-				tagTree = (RootTag) getApplicationClass().getConstructor(Root.class).newInstance(engine).initTree();
-				engine.getCurrentCache().flush();
-			} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | SecurityException | InvocationTargetException | NoSuchMethodException ex) {
-				throw new IllegalStateException(ex);
-			}
-		}
 	}
 
 	public String getRootId() {
@@ -77,7 +65,7 @@ public void setIndexHtml(String indexHtml) {
 		this.indexHtml = indexHtml;
 	}
 
-	public RootHtmlDomNode init(Sender send) {
+	public RootHtmlDomNode init(Sender send, RootTag tagTree) {
 		try {
 			return tagTree.init(modelClass.getConstructor(Root.class).newInstance(engine), rootId, send);
 		} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException | NoSuchMethodException | SecurityException e) {