How to create a node in java.util.prefs.Preferences -- Need Help !!
Hi All
I want to know the way of implementing a Node using java.util.prefs.Preferences , and need to store a value.
Your Help wil be greatly appreciated
best Regards
Madumm
http://java.sun.com/j2se/1.5.0/docs/api/java/util/prefs/Preferences.html
Similar Messages
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Java.utils.prefs.Preferences API throws exception on Mac, not Windows
This is a Mac-specific problem. Is it a bug, or am I misusing the java.utils.prefs.Preferences API?
The Preferences flush() API call always throws a BackingStoreException if a system tree preferences root has been read. The system tree has not been modified or written to, but the flush() call is nevertheless throwing an exception. This occurs when running as a normal user without the ability to write to /Library/Preferences.
See sample code below. Note that I only want to read the system prefs tree. The user tree write flush fails. If the system tree node is not created, the user flush() succeeds.
Steps to Reproduce
Delete any existing Java prefs files:
~/Library/Preferences/com.apple.java.util.prefs.plist
~/Library/Preferences/com.mycompany.prefstest
/Library/Preferences/com.apple.java.util.prefs.plist
/Library/Preferences/com.mycompany.prefstest
Run the following Java code:
package com.mycompany.prefstest;
import java.util.prefs.BackingStoreException;
import java.util.prefs.Preferences;
public class PrefsTest {
* @param args
public static void main(String[] args) {
String strKey1 = "com/mycompany/prefstest/one/two/three/four/key1";
Preferences systemRoot = Preferences.systemRoot();
Preferences userRoot = Preferences.userRoot();
// Get a value for user prefs.
String value1 = userRoot.get(strKey1, "missing");
// Fall back to system prefs if it is not defined.
if (value1.equals("missing"))
value1 = systemRoot.get(strKey1, "missing");
System.out.println("key1 --> " + value1);
// If still not defined, set a user-specific value
if (value1.equals("missing"))
userRoot.put(strKey1, "value1");
try {
userRoot.flush();
System.out.println("flushed prefs successfully");
catch (BackingStoreException e)
System.out.println("Exception: " + e.toString());
Expected Results
Should produce the output:
key --> missing
flushed prefs successfully
Actual Results
Console output is
key --> missing
Exception: java.util.prefs.BackingStoreException: Synchronization failed for node '/'
Notes
$ java -version
java version "1.6.0_29"
Java(TM) SE Runtime Environment (build 1.6.0_29-b11-402-11D50b)
Java HotSpot(TM) 64-Bit Server VM (build 20.4-b02-402, mixed mode)
also tested with:
java version "1.7.0_04-ea"
Java(TM) SE Runtime Environment (build 1.7.0_04-ea-b16)
Java HotSpot(TM) 64-Bit Server VM (build 23.0-b17, mixed mode)
Mac OS X 10.7.3.
The "Expected Results" are correctly obtained running the same code on MS-Windows.
Running the jar as sudo works (with write access to /Library/Preferences), as expected.Just for fun, try a key without slashes in it (but for example dots if you must use such a long key).
I say that because a quick Google search points out that Apple stores the preferences in a file hierarchy in the user home folder. I can already see how using keys which look like a file path are going to cause nuclear reactors to meltdown... -
Java.util.pref.Preferences
Hello Sir,
Is java.util.pref.Preferences class support property file?
Thanks for advance
balaRead the API for Preferences.
Typical implementations include flat files, OS-specific registries, directory servers and SQL databases. The user of this class needn't be concerned with details of the backing store.
Does that answer your question?
db -
How can I create an instance of "java.util.prefs.WindowsPreferences"?
Hi All,
I was trying to find out a way to access the Windows Registry to add soome keys and and later add a string.
I found WindowsPreferences might be useful in the above mentioned context.
I was trying to create an instance of it, but when I import the class, it says it is invisible.
Can anyone let me know how to instantiate this class.
Note:- Under the same package "java.util.prefs" we have another class "Preferences", Iam able to import this one and use it in my code.
Thank You.
Regards,
Suman.HIt's true that Preferences uses the Registry on Windows systems, that does not mean you can use it as a Registry API. The only part of the Registry you can access are those branches that are set aside for java.util.prefs: HKLM\Software\JavaSoft\Prefs and HKCU\Software\JavaSoft\Prefs. IF you need to access other parts of the Registry, you'll need to use JNI or a separate Windows Registry library.
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Please help!
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GopalHi
I am getting the following error while creating a dynamic context node with 2 attributes. Please help me resolve this problem.
Note
The following error text was processed in the system PET : Line types of an internal table and a work area not compatible.
The error occurred on the application server FMSAP995_PET_02 and in the work process 0 .
The termination type was: RABAX_STATE
The ABAP call stack was:
Method: IF_WD_CONTEXT_NODE~GET_STATIC_ATTRIBUTES_TABLE of program CL_WDR_CONTEXT_NODE_VAL=======CP
Method: GET_REF_TO_TABLE of program CL_SALV_WD_DATA_TABLE=========CP
Method: EXECUTE of program CL_SALV_WD_SERVICE_MANAGER====CP
Method: APPLY_SERVICES of program CL_SALV_BS_RESULT_DATA_TABLE==CP
Method: REFRESH of program CL_SALV_BS_RESULT_DATA_TABLE==CP
Method: IF_SALV_WD_COMP_TABLE_DATA~MAP_FROM_SOURCE_DATA of program CL_SALV_WD_C_TABLE_V_TABLE====CP
Method: IF_SALV_WD_COMP_TABLE_DATA~MAP_FROM_SOURCE of program CL_SALV_WD_C_TABLE_V_TABLE====CP
Method: IF_SALV_WD_COMP_TABLE_DATA~UPDATE of program CL_SALV_WD_C_TABLE_V_TABLE====CP
Method: IF_SALV_WD_VIEW~MODIFY of program CL_SALV_WD_C_TABLE_V_TABLE====CP
Method: IF_SALV_WD_COMPONENT~VIEW_MODIFY of program CL_SALV_WD_A_COMPONENT========CP
My code is like the following:
TYPES: BEGIN OF t_type,
CARRID TYPE sflight-carrid,
CONNID TYPE sflight-connid,
END OF t_type.
Data: i_struc type table of t_type,
dyn_node type ref to if_wd_context_node,
rootnode_info type ref to if_wd_context_node_info,
i_node_att type wdr_context_attr_info_map,
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insert wa_node_att into table i_node_att.
clear i_struc. refresh i_struc.
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is_multiple = abap_true ).
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I am trying to create a new node. That is
CONTEXT
- DYNFLIGHT
CARRID
CONNID
As you see above I am trying to create 'DYNFLIGHT' along with the 2 attributes which are inside this node. The structure of the node that is, no.of attributes may vary based on some condition. Thats why I am trying to create a node dynamically.
Also I cannot define the structure in the ABAP dictionary because it changes based on condition
Message was edited by: gopalkrishna baliga -
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