While running two instances of
Java; VM; Vendor = 1.4.1; Java HotSpot(TM) Client VM 1.4.1-b21; Sun Microsystems Inc.
some messages are sent to stdout/stderr periodically. I have attached the messages:

15.11.2002 15:27:46 java.util.prefs.FileSystemPreferences checkLockFile0ErrorCode
WARNING: Could not lock System prefs.Unix error code 1247996512.
15.11.2002 15:27:46 java.util.prefs.FileSystemPreferences syncWorld
WARNING: Couldn't flush system prefs: java.util.prefs.BackingStoreException: Couldn't get file lock.
15.11.2002 15:28:16 java.util.prefs.FileSystemPreferences checkLockFile0ErrorCode
WARNING: Could not lock System prefs.Unix error code 1247996512.
15.11.2002 15:28:16 java.util.prefs.FileSystemPreferences syncWorld
WARNING: Couldn't flush system prefs: java.util.prefs.BackingStoreException: Couldn't get file lock.
15.11.2002 15:28:46 java.util.prefs.FileSystemPreferences checkLockFile0ErrorCode
WARNING: Could not lock System prefs.Unix error code 1247996512.
15.11.2002 15:28:46 java.util.prefs.FileSystemPreferences syncWorld
WARNING: Couldn't flush system prefs: java.util.prefs.BackingStoreException: Couldn't get file lock.
15.11.2002 15:29:16 java.util.prefs.FileSystemPreferences checkLockFile0ErrorCode
WARNING: Could not lock System prefs.Unix error code 1247996512.
15.11.2002 15:29:16 java.util.prefs.FileSystemPreferences syncWorld
WARNING: Couldn't flush system prefs: java.util.prefs.BackingStoreException: Couldn't get file lock.