For Windows systemRoot and userRoot are stored in HKEY_LOCAL_MACHINESOFTWAREJavaSoftPrefs and HKEY_CURRENT_USERSoftwareJavaSoftPrefs respectively.
For Unix systemRoot and userRoot are stored in "/etc/.java" and "${user.home}/.java/.userPrefs", respectively.
Note that for Unix the locations can be changed by specifying "java.util.prefs.userRoot" and "java.util.prefs.systemRoot" properties
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