getBundle().getBundleContext();
try {
ServiceReference[] refs = context.getAllServiceReferences(
EpnMarshallerHelper.class.getName(), null);
for (ServiceReference ref : refs) {
EpnMarshallerHelper helper = (EpnMarshallerHelper) context.getService(ref);
_helpers.add(helper);
}
} catch (InvalidSyntaxException e) {
}
}