Name: gm110360 Date: 04/01/2004


FULL PRODUCT VERSION :
java version "1.4.2_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
Java HotSpot(TM) Client VM (build 1.4.2_04-b05, mixed mode)

FULL OS VERSION :
Linux lpdbsrv01 2.4.9-e.3 #1 Fri May 3 17:02:43 EDT 2002 i686 unknown

A DESCRIPTION OF THE PROBLEM :
Hi,

I'm using j2sdk1.4.2_02 on Linux. I could create preference data in $HOME/.java/.userPrefs/... But, When I try to get them later, I can not get the values.

Note, this works if it runs a standalone java application. But, it doesn't work
if it's a servlet application after servlet engine is restarted.

Please note that you should use Preferences.get() from other application
after first application used Preferences.put().


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Put the preferences values first(It works) usinng a simple servlet based class.
Restart the server.
Try to read the preferences from another servlet based class.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The first section creates preferences values under $HOME/.java/.userPrefs/...
Getting them the values put before expected.


ACTUAL -
Getting the put preferences values is not successful. I get the default values even if preferences values are available in the preferences storage.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
stout.log:

*****************************************************
Resin 2.1.9 (built Tue Apr 15 14:28:40 PDT 2003)

Copyright(c) 1998-2003 Caucho Technology. All rights reserved.

Starting Resin on Thu, 01 Apr 2004 11:50:39 +0300 (EEST)

http listening to *:8080

srun listening to 127.0.0.1:6802

deger1 ---> able to get the value

deger2 ---> able to get the value

deger3 ---> able to get the value

deger1 ---> able to get the value

deger2 ---> able to get the value

deger3 ---> able to get the value

Resin 2.1.9 (built Tue Apr 15 14:28:40 PDT 2003)

Copyright(c) 1998-2003 Caucho Technology. All rights reserved.

Starting Resin on Thu, 01 Apr 2004 11:53:58 +0300 (EEST)

http listening to *:8080

srun listening to 127.0.0.1:6802

yok1---> unable to get the value

yok2---> unable to get the value

yok3---> unable to get the value

*****************************************************

sterr.log:

*****************************************************
[2004-04-01 11:50:42.808] initializing application
http://localhost:8080/ubtools-1.0.0

[2004-04-01 11:50:43.005] initializing application
http://localhost:8080/ubtools

[2004-04-01 11:50:43.048] initializing application http://localhost:8080/

[2004-04-01 11:50:58.159] Compiling
/home/resin/resin-2.1.9/webapps/ubtools/WEB-INF/classes/com/ubTools/servlet/
itrprof/itrprof.java

Apr 1, 2004 11:51:18 AM java.util.prefs.FileSystemPreferences$2 run

INFO: Created user preferences directory.

[2004-04-01 11:52:46.858] closing application http://localhost:8080/ubtools

[2004-04-01 11:52:46.964] initializing application
http://localhost:8080/ubtools

[2004-04-01 11:52:46.980] Compiling
/home/resin/resin-2.1.9/webapps/ubtools/WEB-INF/classes/com/ubTools/servlet/
itrprof/itrprof.java

closing server

[2004-04-01 11:53:54.998] closing application http://localhost:8080/

[2004-04-01 11:53:55.008] closing application
http://localhost:8080/ubtools-1.0.0

[2004-04-01 11:53:55.011] closing application http://localhost:8080/ubtools

[2004-04-01 11:54:02.080] initializing application
http://localhost:8080/ubtools-1.0.0

[2004-04-01 11:54:02.275] initializing application
http://localhost:8080/ubtools

[2004-04-01 11:54:02.306] initializing application http://localhost:8080/

Apr 1, 2004 11:54:33 AM java.util.prefs.FileSystemPreferences syncWorld

WARNING: Couldn't flush user prefs: java.util.prefs.BackingStoreException:
java.lang.NullPointerException

*****************************************************


I saw the following warnings in my logs for every 30 seconds:

Oct 30, 2003 4:10:17 PM java.util.prefs.FileSystemPreferences syncWorld
WARNING: Couldn't flush user prefs: java.util.prefs.BackingStoreException: java.lang.NullPointerException
Oct 30, 2003 4:10:47 PM java.util.prefs.FileSystemPreferences syncWorld
WARNING: Couldn't flush user prefs: java.util.prefs.BackingStoreException: java.lang.NullPointerException
Oct 30, 2003 4:11:17 PM java.util.prefs.FileSystemPreferences syncWorld
WARNING: Couldn't flush user prefs: java.util.prefs.BackingStoreException: java.lang.NullPointerException
Oct 30, 2003 4:11:47 PM java.util.prefs.FileSystemPreferences syncWorld
WARNING: Couldn't flush user prefs: java.util.prefs.BackingStoreException: java.lang.NullPointerException




REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
Put the preferences values first(It works):

Preferences myPreferences = Preferences.userNodeForPackage(this.getClass());

myPreferences.put("anahtar1","deger1");
myPreferences.put("anahtar2","deger2");
myPreferences.put("anahtar3","deger3");


try {
      myPreferences.flush();
    } catch (java.util.prefs.BackingStoreException e) {out.println("exception: " + e.getMessage());}


Get the preferences values later(It doesn't work):

Preferences myPreferences = Preferences.userNodeForPackage(this.getClass());

out.println(myPreferences.get("anahtar1","yok1"));
out.println(myPreferences.get("anahtar2","yok2"));
out.println(myPreferences.get("anahtar3","yok3"));


---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Not available.
(Incident Review ID: 223080)
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