Java Property Retrieval: Prioritizing Active Values

The purpose of this code is to retrieve a property value based on a key name from two different property files. \n\nThe method first checks if the default properties have been loaded. If not, it calls the loadProperties() and loadPropertiesActive() methods to load the default and active properties respectively. \n\nNext, it checks if the keyName parameter is empty. If it is, an IllegalArgumentException is thrown.\n\nThe method then retrieves the value associated with the keyName from the default properties file using the getProperty() method. It also retrieves the value from the active properties file using the same method.\n\nIf the value from the active properties file is not null, it means that there is an active value for the given key, so it returns the active value. Otherwise, it returns the value from the default properties file.\n\nOverall, this code allows for retrieving property values from two different property files, with the active properties taking precedence over the default properties.