- Multimap<P, DataReaderRegistration<P, D>> configReaders = HashMultimap.create();
- Multimap<P, DataReaderRegistration<P, D>> operationalReaders = HashMultimap.create();
+ Multimap<P, DataReaderRegistration<P, D>> configReaders = Multimaps.synchronizedSetMultimap(HashMultimap.<P, DataReaderRegistration<P, D>>create());
+ Multimap<P, DataReaderRegistration<P, D>> operationalReaders = Multimaps.synchronizedSetMultimap(HashMultimap.<P, DataReaderRegistration<P, D>>create());