[ACCEPTED]-Preference API storage-preferences

Accepted answer
Score: 38

For Windows systemRoot and userRoot are 4 stored in HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Prefs and HKEY_CURRENT_USER\Software\JavaSoft\Prefs respectively.

For Unix systemRoot 3 and userRoot are stored in "/etc/.java" and "${user.home}/.java/.userPrefs", respectively.

Note 2 that for Unix the locations can be changed 1 by specifying "java.util.prefs.userRoot" and "java.util.prefs.systemRoot" properties

Score: 14

I have to extend n002213fs' answer, because 3 it seems to me, that the Storage Location 2 is a big mess. Note that Windows saves it 1 in the Windows Registry and Unix saves it in prefs.xml-files.


  • Windows (32Bit): HKEY_CURRENT_USER\Software\JavaSoft\Prefs
  • Windows (64Bit) with JVM (64Bit): HKEY_CURRENT_USER\Software\JavaSoft\Prefs
  • Windows (64Bit) with JVM (32Bit): HKEY_CURRENT_USER\Software\Wow6432Node\JavaSoft\Prefs
  • Unix: System.getProperty("java.util.prefs.userRoot") or (if the previous value is not set) ~/.java/.userPrefs


  • Windows (32Bit): HKEY_LOCAL_MACHINE\Software\JavaSoft\Prefs
  • Windows (64Bit) with JVM (64Bit): HKEY_LOCAL_MACHINE\Software\JavaSoft\Prefs
  • Windows (64Bit) with JVM (32Bit): HKEY_LOCAL_MACHINE\Software\Wow6432Node\JavaSoft\Prefs
  • Unix: System.getProperty("java.util.prefs.systemRoot") or (if the previous value is not set) System.getProperty("java.home")+"/.systemPrefs" (System.getProperty("java.home") might be /etc/.java/. You can check it in a terminal with $JAVA_HOME.)

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