synchronized boolean hasContribution(long id) { Object result = newContributions.getByKey(new Long(id));
synchronized boolean hasContribution(String id) { Object result = newContributions.getByKey(id);
	synchronized boolean hasContribution(long id) {		Object result = newContributions.getByKey(new Long(id));		if (result == null)			result = getFormerContributions().getByKey(new Long(id));		return result != null;	}