Deploy on JBoss4.2.3GA (JBossTools)

Env:
Macosx
Java™ SE Runtime Environment (build 1.6.0_37-b06-434-10M3909)
Eclipse Juno
JBoss Tools Common - Mylyn 3.4.0.Beta2-v20121114-2253-B23 org.jboss.tools.common.mylyn.feature.feature.group JBoss by Red Hat
JBoss Archives Tools 3.4.0.Beta2-v20121114-1949-B18 org.jboss.ide.eclipse.archives.feature.feature.group JBoss by Red Hat
JBoss Central 1.1.0.Beta2-v20121114-2258-B36 org.jboss.tools.central.feature.feature.group JBoss by Red Hat
JBoss Runtime Detection Core 2.0.0.Beta2-v20121114-2253-B23 org.jboss.tools.runtime.core.feature.feature.group JBoss by Red Hat
JBoss Runtime Seam Detector 3.4.0.Beta2-v20121114-2003-B27 org.jboss.tools.runtime.seam.detector.feature.feature.group JBoss by Red Hat
JBossAS Tools Server Adapter 2.4.0.Beta2-v20121114-1949-B18 org.jboss.ide.eclipse.as.serverAdapter.wtp.feature.feature.group
JBoss Tools JDT Extensions 3.4.0.Beta2-v20121114-2253-B23 org.jboss.tools.common.jdt.feature.feature.group JBoss by Red Hat

I’ve created a Vaadin project with Vaadin plugin for vaadin 7 (SNAPSHOT). All is fine: ivy has downloaded all necessary items. I’ve added the application on Jboss with option add/remove (jboss tools) and open in browser: error 404. Only exporting in war file and deploing it on jboss I can view the application. This happens after the last update of jboss tools.