MongoDBDialect.java

private BasicDBObject prepareIdObject(EntityKey key) { 		
       return this.prepareIdObject( key.getColumnNames(), key.getColumnValues() ); 	
}  	

private BasicDBObject prepareIdObject(AssociationKey key){ 		
       return this.prepareIdObject( key.getColumnNames(), key.getColumnValues() ); 	
}  	

private BasicDBObject prepareIdObject(String[] columnNames, Object[] columnValues){ /*...*/ }