Secured JavaEE appclient hangs on invalid login

See attached sample EAR file: it contains a secured EJB and a JavaEE application client. When running the JavaEE application client, you are prompted to enter a user/password, which causes an authentication against a security domain (the prompt to enter login/password does not work correctly, so enter username when nothing more happens, press enter, enter password when nothing more happens and press enter ).

If you enter valid credentials (e.g. "admin/admin" or "kunde/kunde"), everything is fine. But if you enter e.g. an invalid password, the app client container does not exit. It hangs at the step
"20:39:28,649 INFO [org.jboss.as] (MSC service thread 1-2) JBAS015950: WildFly 8.1.0.Final "Kenny" stopped in 339ms"

To reproduce:
a) modify "standalone.xml":
a.1) I need a custom realm:
<security-realm name="KnaufRealm">
<authentication>
<jaas name="knaufsecurity"/>
</authentication>
</security-realm>
a.2) add this security domain:
<security-domain name="knaufsecurity" cache-type="default">
<authentication>
<login-module code="Database" flag="required">
<module-option name="dsJndiName" value="java:jboss/datasources/ExampleDS"/>
<module-option name="principalsQuery" value="SELECT PASSWORT FROM BENUTZER WHERE LOGIN=?"/>
<module-option name="rolesQuery" value="SELECT R.ROLLE, 'Roles' FROM ROLLE AS R, BENUTZER_ROLLE AS BR, BENUTZER AS B WHERE B.LOGIN=? AND BR.ROLLEN_ID = R.ID AND BR.BENUTZER_ID = B.ID"/>
<module-option name="unauthenticatedIdentity" value="gast"/>
</login-module>
</authentication>
</security-domain>
a.3) point the remoting connector to my own security realm:
<subsystem xmlns="urn:jboss:domain:remoting:2.0">
<endpoint worker="default"/>
<http-connector name="http-remoting-connector" connector-ref="default" security-realm="KnaufRealm"/>
</subsystem>

b) deploy attached EAR file to the server
c) run JavaEE application client: %WILDFLY_HOME%\bin\appclient.bat c:\path_to\Security.ear#SecurityClient.jar