## org.das2.system.NullPreferencesFactory

Creates NullPreferences for use with applets. The system property java.util.prefs.PreferencesFactory should be set to org.das2.system.NullPreferencesFactory to use this class. System.setProperty( "java.util.prefs.PreferencesFactory", "org.das2.system.NullPreferencesFactory" ) doesn't work in applets--security exception. Also this works: java -Djava.util.prefs.PreferencesFactory=org.das2.system.NullPreferencesFactory ... I'm not sure where I found this solution originally, but here is a nice writeup: http://www.allaboutbalance.com/articles/disableprefs/

## NullPreferencesFactory( )

## systemRoot

systemRoot( ) → java.util.prefs.Preferences

### Returns:

java.util.prefs.Preferences
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## userRoot

userRoot( ) → java.util.prefs.Preferences

### Returns:

java.util.prefs.Preferences
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