ADF Provides extension to standard Java Preferences API and is maintained in MDS Repository. You can reference following Javadoc and Blog: But this does not work in Plain ADF application and you will run into following exception. oracle.mds.exception.ReadOnlyStoreException: MDS-01273: The operation on the resource /oracle/adf/share/prefs/data/preferences.xml failed because source metadata store mapped to the namespace /

Transient View Objects are very useful to build data entry forms when you don’t necessarily want to create instances of Entity based View Objects till later time. In my projects, i have always tried to use Transient View Objects instead of POJO Databeans to bind to UI components. I have also used such Transient View