Postgresql still can be accessed via DB driver after postgresql stop for jboss app

https://bugzilla.redhat.com/show_bug.cgi?id=1081796 Create one jboss app(e.g.,
myjbosseap6), embedded with postgresql-8.4 db cartridge and add postgresql.jsp
into src/main/webapp of local repo, ant then git push. Access 
http://$appname-$domainname.int.rhcloud.com/postgresql.jsp after postgresql
stop, found it still can be accessed, restart jbosseap app, found it still
works.