try { if (dfm.getDestinationFactory(ns) == this) { dfm.deregisterDestinationFactory(ns);
try { if (dfm.getDestinationFactory(ns) == this) { dfm.deregisterDestinationFactory(ns);
try { if (dfm.getDestinationFactory(ns) == this) { dfm.deregisterDestinationFactory(ns);
try { if (dfm.getDestinationFactory(ns) == this) { dfm.deregisterDestinationFactory(ns);