When editing certain resource files (js / css) sometimes locks the files on windows requiring a restart, even if hot reloading should theoretically work.
problem reported and analysed in Forum (including a supposed patch):
Places where UrlConnection.openConnection().getLastModified() is used in ZK:
similar myfaces issue/patch reported here:
older discussion on jboss: https://developer.jboss.org/thread/96782
close the connections preventing this kind of lock or leak