Understanding Scope

Hi all,
I'm having a little difficulty understanding scope. In particular take a look at the following example:
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
I understand that ToolKit is an abstract class and that getDefaultToolkit() is a static method. What I don't understand is how you can call the getScreenSize() from the getDefaultToolkit() using the "." notation.
Why can't you just go Toolkit.getScreenSize(); ?
I tried compiling both and in the latter, i got the following error:
SwingingPad.java:32: non-static method getScreenSize() cannot be referenced from
a static context
Dimension screenSize = Toolkit.getScreenSize();
^
1 error
This has kind of given me the idea that I was wrong in thinking that getDefaultToolkit() was a static method, but is actually a static class. Would this be the reason why you could call the getScreenSize() as it is a method within the static inner class?
Can anyone point me in the right direction?
cheers

I understand that ToolKit is an abstract class and
that getDefaultToolkit() is a static method. What I
don't understand is how you can call the
getScreenSize() from the getDefaultToolkit() using the
"." notation. The line Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize() is short for Toolkit tk = Toolkit.getDefaultToolkit();
Dimension screenSize = tk.getScreenSize();You must have an instance of Toolkit to use getScreenSize() and you use getDefaultToolkit() to get the default (for your system) Toolkit instance.
Why can't you just go Toolkit.getScreenSize(); ? Because the screen size is an instance variable of a Toolkit.

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Hi guys,
I've pretty new to java, and I think i'm having a little trouble
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JComboBox queryBox3 = new JComboBox(items);
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public class Editor extends JFrame implements ActionListener
// This is the XMLTree object which displays the XML in a JTree
private XMLTree XMLTree;
private JTextArea textArea, textArea2, textArea3;
// One JScrollPane is the container for the JTree, the other is for
the textArea
private JScrollPane jScroll, jScrollRt, jScrollUp,
jScrollBelow;
private JSplitPane splitPane, splitPane2;
private JPanel panel;
// This JButton handles the tree Refresh feature
private JButton refreshButton;
// This Listener allows the frame's close button to work properly
private WindowListener winClosing;
private JSplitPane splitpane3;
// Menu Objects
private JMenuBar menuBar;
private JMenu fileMenu;
private JMenuItem newItem, openItem, saveItem,
exitItem;
// This JDialog object will be used to allow the user to cancel an exit
command
private JDialog verifyDialog;
// These JLabel objects will be used to display the error messages
private JLabel question;
// These JButtons are used with the verifyDialog object
private JButton okButton, cancelButton;
private JComboBox testBox;
// These two constants set the width and height of the frame
private static final int FRAME_WIDTH = 600;
private static final int FRAME_HEIGHT = 450;
* This constructor passes the graphical construction off to the
overloaded constructor
* and then handles the processing of the XML text
public Editor( String title, ArrayList xmlText ) throws
ParserConfigurationException
this( title );
textArea.setText( ( String )xmlText.get( 0 ) + "\n" );
for ( int i = 1; i < xmlText.size(); i++ )
textArea.append( ( String )xmlText.get( i ) + "\n" );
try
XMLTree.refresh( textArea.getText() );
catch( Exception ex )
String message = ex.getMessage();
System.out.println( message );
}//end try/catch
} //end Editor( String title, String xml )
* This constructor builds a frame containing a JSplitPane, which in
turn contains two
JScrollPanes.
* One of the panes contains an XMLTree object and the other contains
a JTextArea object.
public Editor( String title ) throws ParserConfigurationException
// This builds the JFrame portion of the object
super( title );
Toolkit toolkit;
Dimension dim, minimumSize;
int screenHeight, screenWidth;
// Initialize basic layout properties
setBackground( Color.lightGray );
getContentPane().setLayout( new BorderLayout() );
// Set the frame's display to be WIDTH x HEIGHT in the middle of
the screen
toolkit = Toolkit.getDefaultToolkit();
dim = toolkit.getScreenSize();
screenHeight = dim.height;
screenWidth = dim.width;
setBounds( (screenWidth-FRAME_WIDTH)/2,
(screenHeight-FRAME_HEIGHT)/2, FRAME_WIDTH,
FRAME_HEIGHT );
// Build the Menu
// Build the verify dialog
// Set the Default Close Operation
// Create the refresh button object
// Add the button to the frame
// Create two JScrollPane objects
jScroll = new JScrollPane();
jScrollRt = new JScrollPane();
// First, create the JTextArea:
// Create the JTextArea and add it to the right hand JScroll
textArea = new JTextArea( 200,150 );
jScrollRt.getViewport().add( textArea );
// Next, create the XMLTree
XMLTree = new XMLTree();
XMLTree.getSelectionModel().setSelectionMode(
TreeSelectionModel.SINGLE_TREE_SELECTION
XMLTree.setShowsRootHandles( true );
// A more advanced version of this tool would allow the JTree to
be editable
XMLTree.setEditable( false );
// Wrap the JTree in a JScroll so that we can scroll it in the
JSplitPane.
jScroll.getViewport().add( XMLTree );
// Create the JSplitPane and add the two JScroll objects
splitPane = new JSplitPane( JSplitPane.HORIZONTAL_SPLIT, jScroll,
jScrollRt );
splitPane.setOneTouchExpandable(true);
splitPane.setDividerLocation(200);
jScrollUp = new JScrollPane();
jScrollBelow=new JScrollPane();
// Here is were the error is coming up
String [] items = (String []) xmlText.toArray (new String[
xmlText.size () ]);
JComboBox queryBox = new JComboBox(items);
JComboBox queryBox2 = new JComboBox(items);
JComboBox queryBox3 = new JComboBox(items);
JComboBox queryBox4 = new JComboBox(items);
JComboBox queryBox5 = new JComboBox(items);
* I'm adding the scroll pane to the split pane,
* a panel to the top of the split pane, and some uneditible
combo boxes
* to them. Then I'll rearrange them to rearrange them, but
unfortunately am getting an error thrown up above.
panel = new JPanel();
panel.add(queryBox);
panel.add(queryBox2);
panel.add(queryBox3);
panel.add(queryBox4);
panel.add(queryBox5);
jScrollUp.getViewport().add( panel );
// Now building a text area
textArea3 = new JTextArea(200, 150);
jScrollBelow.getViewport().add( textArea3 );
splitPane2 = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
jScrollUp, jScrollBelow);
splitPane2.setPreferredSize( new Dimension(300, 200) );
splitPane2.setDividerLocation(100);
splitPane2.setOneTouchExpandable(true);
// in here can change the contents of the split pane
getContentPane().add(splitPane2,BorderLayout.SOUTH);
// Provide minimum sizes for the two components in the split pane
minimumSize = new Dimension(200, 150);
jScroll.setMinimumSize( minimumSize );
jScrollRt.setMinimumSize( minimumSize );
// Provide a preferred size for the split pane
splitPane.setPreferredSize( new Dimension(400, 300) );
// Add the split pane to the frame
getContentPane().add( splitPane, BorderLayout.CENTER );
//Put the final touches to the JFrame object
validate();
setVisible(true);
// Add a WindowListener so that we can close the window
winClosing = new WindowAdapter()
public void windowClosing(WindowEvent e)
verifyDialog.show();
addWindowListener(winClosing);
} //end Editor()
* When a user event occurs, this method is called. If the action
performed was a click
* of the "Refresh" button, then the XMLTree object is updated using
the current XML text
* contained in the JTextArea
public void actionPerformed( ActionEvent ae )
if ( ae.getActionCommand().equals( "Refresh" ) )
try
XMLTree.refresh( textArea.getText() );
catch( Exception ex )
String message = ex.getMessage();
ex.printStackTrace();
}//end try/catch
else if ( ae.getActionCommand().equals( "OK" ) )
exit();
else if ( ae.getActionCommand().equals( "Cancel" ) )
verifyDialog.hide();
}//end if/else if
} //end actionPerformed()
// Program execution begins here. An XML file (*.xml) must be passed
into the method
public static void main( String[] args )
String fileName = "";
BufferedReader reader;
String line;
ArrayList xmlText = null;
Editor Editor;
// Build a Document object based on the specified XML file
try
if( args.length > 0 )
fileName = args[0];
if ( fileName.substring( fileName.indexOf( '.' ) ).equals(
".xml" ) )
reader = new BufferedReader( new FileReader( fileName )
xmlText = new ArrayList();
while ( ( line = reader.readLine() ) != null )
xmlText.add( line );
} //end while ( ( line = reader.readLine() ) != null )
// The file will have to be re-read when the Document
object is parsed
reader.close();
// Construct the GUI components and pass a reference to
the XML root node
Editor = new Editor( "Editor 1.0", xmlText );
else
help();
} //end if ( fileName.substring( fileName.indexOf( '.' )
).equals( ".xml" ) )
else
Editor = new Editor( "Editor 1.0" );
} //end if( args.length > 0 )
catch( FileNotFoundException fnfEx )
System.out.println( fileName + " was not found." );
exit();
catch( Exception ex )
ex.printStackTrace();
exit();
}// end try/catch
}// end main()
// A common source of operating instructions
private static void help()
System.out.println( "\nUsage: java Editor filename.xml" );
System.exit(0);
} //end help()
// A common point of exit
public static void exit()
System.out.println( "\nThank you for using Editor 1.0" );
System.exit(0);
} //end exit()
class newMenuHandler implements ActionListener
public void actionPerformed( ActionEvent ae )
textArea.setText( "" );
try
// Next, create a new XMLTree
XMLTree = new XMLTree();
XMLTree.getSelectionModel().setSelectionMode(
TreeSelectionModel.SINGLE_TREE_SELECTION );
XMLTree.setShowsRootHandles( true );
// A more advanced version of this tool would allow the JTree
to be editable
XMLTree.setEditable( false );
catch( Exception ex )
String message = ex.getMessage();
ex.printStackTrace();
}//end try/catch
}//end actionPerformed()
}//end class newMenuHandler
class openMenuHandler implements ActionListener
JFileChooser jfc;
Container parent;
int choice;
openMenuHandler()
super();
jfc = new JFileChooser();
jfc.setSize( 400,300 );
jfc.setFileFilter( new XmlFileFilter() );
parent = openItem.getParent();
}//end openMenuHandler()
public void actionPerformed( ActionEvent ae )
// Displays the jfc and sets the dialog to 'open'
choice = jfc.showOpenDialog( parent );
if ( choice == JFileChooser.APPROVE_OPTION )
String fileName, line;
BufferedReader reader;
fileName = jfc.getSelectedFile().getAbsolutePath();
try
reader = new BufferedReader( new FileReader( fileName ) );
textArea.setText( reader.readLine() + "\n" );
while ( ( line = reader.readLine() ) != null )
textArea.append( line + "\n" );
} //end while ( ( line = reader.readLine() ) != null )
// The file will have to be re-read when the Document
object is parsed
reader.close();
XMLTree.refresh( textArea.getText() );
catch ( Exception ex )
String message = ex.getMessage();
ex.printStackTrace();
}//end try/catch
jfc.setCurrentDirectory( new File( fileName ) );
} //end if ( choice == JFileChooser.APPROVE_OPTION )
}//end actionPerformed()
}//end class openMenuHandler
class saveMenuHandler implements ActionListener
JFileChooser jfc;
Container parent;
int choice;
saveMenuHandler()
super();
jfc = new JFileChooser();
jfc.setSize( 400,300 );
jfc.setFileFilter( new XmlFileFilter() );
parent = saveItem.getParent();
}//end saveMenuHandler()
public void actionPerformed( ActionEvent ae )
// Displays the jfc and sets the dialog to 'save'
choice = jfc.showSaveDialog( parent );
if ( choice == JFileChooser.APPROVE_OPTION )
String fileName;
File fObj;
FileWriter writer;
fileName = jfc.getSelectedFile().getAbsolutePath();
try
writer = new FileWriter( fileName );
textArea.write( writer );
// The file will have to be re-read when the Document
object is parsed
writer.close();
catch ( IOException ioe )
ioe.printStackTrace();
}//end try/catch
jfc.setCurrentDirectory( new File( fileName ) );
} //end if ( choice == JFileChooser.APPROVE_OPTION )
}//end actionPerformed()
}//end class saveMenuHandler
class exitMenuHandler implements ActionListener
public void actionPerformed( ActionEvent ae )
verifyDialog.show();
}//end actionPerformed()
}//end class exitMenuHandler
class XmlFileFilter extends javax.swing.filechooser.FileFilter
public boolean accept( File fobj )
if ( fobj.isDirectory() )
return true;
else
return fobj.getName().endsWith( ".xml" );
}//end accept()
public String getDescription()
return "*.xml";
}//end getDescription()
}//end class XmlFileFilter
} //end class Editor
Sorry if this post has been a bit lengthy, any help you guys could give
me solving this would be really appreciated.
Thanks,
Iain.

Hey. Couple pointers:
When posting, try to keep code inbetween code tags (button between spell check and quote original). It will pretty-print the code.
Posting code is good. Usually, though, you want to post theminimum amount of code which runs and shows your problem.
That way people don't have to wade through irrelevant stuff and
they have an easier time helping.
http://homepage1.nifty.com/algafield/sscce.html
As for your problem, this is a scope issue. You declare an
ArrayList xmlText in main(). That means that everywhere after
the declaration in main(), you can reference your xmlText.
So far so good. Then, inside main(), you call
Editor = new Editor( "Editor 1.0", xmlText );Now you've passed the xmlText variable to a new method,
Editor(String title, ArrayList xmlText) [which happens to be a
constructor, but that's not important]. When you do that, you
make the two variables title and xmlText available to the whole
Editor(String, ArrayList) method.
This is where you get messed up. You invoke another method
from inside Editor(String, ArrayList). When you call
this(title);you're invoking the method Editor(String title). You aren't passing
in your arraylist, though. You've got code in the Editor(String) method
which is trying to reference xmlText, but you'd need to pass in
your ArrayList in order to do so.
My suggestion would be to merge the two constructor methods into
one, Editor(String title, ArrayList xmlText).

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writetime := {SRMFILE.WRITETIME};
currentfilename := {SRMFILE.FILENAME};
fileactualsize := {SRMFILE.ACTUALSIZE}/1024/1024;
thisfilesystemdevice := {SRMFILESYSTEM.FILESYSTEMDEVICE};
In a following formula i want to display the number of records (recordcount)
Evaluateafter ({@Access plus Modified});
recordcount;
But in formula editor i get an error unless i define recordcount again as
Global numbervar recordcount;
and then the count is zero.
I thought Global forces a variable to be visible throughout the report?

Carl, the fields on m y report are the ones calculated in the IF logic :-
parentdir := {SRMFILE.PARENTDIR};
accesstime := {SRMFILE.ACCESSTIME};
writetime := {SRMFILE.WRITETIME};
currentfilename := {SRMFILE.FILENAME};
fileactualsize := {SRMFILE.ACTUALSIZE}/1024/1024;
thisfilesystemdevice := {SRMFILESYSTEM.FILESYSTEMDEVICE};
recordcount := recordcount+1;
Each variable in the IF logic is further defined by another formula i.e. :-
EvaluateAfter ({@Access plus Modified});
StringVar currentfilename;
currentfilename;
The formulas for each varioable are then defined in the details section.
This is a small sample of the report :-
FilesystemDevice     Actual size(GB)     Access      ParentDir     Recordcount
/dev/vx/dsk/dvgy322/db2     0.00     7/15/2006 9:36:30 PM     /db2/pdid322/sqllib/     1.00
/dev/vx/dsk/dvgy322/db2     0.00     7/15/2006 9:36:30 PM     /db2/pdid322/sqllib/     1.00
/dev/vx/dsk/dvgy322/db2     0.00     7/15/2006 9:36:30 PM     /db2/pdid322/sqllib/     1.00
/dev/vx/dsk/dvgy322/db2     0.00     7/15/2006 9:36:30 PM     /db2/pdid322/sqllib/     1.00
/dev/vx/dsk/dvgy322/db2     0.00     7/15/2006 9:36:30 PM     /db2/pdid322/sqllib/     1.00
/dev/vx/dsk/dvgy322/db2     0.00     7/15/2006 9:36:30 PM     /db2/pdid322/sqllib/     1.00
/dev/vx/dsk/dvgy322/db2     0.00     7/15/2006 9:36:30 PM     /db2/pdid322/sqllib/     1.00
/dev/vx/dsk/dvgy322/db2     0.00     7/15/2006 9:36:30 PM     /db2/pdid322/sqllib/     1.00
/dev/vx/dsk/dvgy322/db2     0.00     7/19/2006 8:08:08 PM     /db2/pdid322/piris00q/dbbackup/     2.00
/dev/vx/dsk/dvgy322/db2     0.00     7/15/2006 9:38:48 PM     /db2/pdid322/sqllib/hmonCache/pdid322/     3.00
/dev/vx/dsk/dvgy322/db2     0.00     7/15/2006 9:38:48 PM     /db2/pdid322/sqllib/hmonCache/pdid322/     3.00
/dev/vx/dsk/dvgy322/db2     0.00     7/15/2006 9:38:48 PM     /db2/pdid322/sqllib/hmonCache/pdid322/     3.00
/dev/vx/dsk/dvgy322/db2     0.00     7/15/2006 9:38:48 PM     /db2/pdid322/sqllib/hmonCache/pdid322/     3.00
/dev/vx/dsk/dvgy322/db2     0.00     7/15/2006 9:38:48 PM     /db2/pdid322/sqllib/hmonCache/pdid322/     3.00
You will see that "recordcount" stays at 1 for many of the "duplicate" entries. Then moves to 2 for a single record, then 3 for many.
Thanks John

Problem with beans in session scope

Hello,
I developped a website using JSP/Tomcat and I can't figure out how to fix this problem.
I am using beans in session scope to know when a user is actualy logged in or not and to make some basic informations about him avaible to the pages. I then add those beans to an application scope bean that manages the users, letting me know how many are logged in, etc... I store the user beans in a Vector list.
The problem is that the session beans never seem to be destroyed. I made a logout page which use <jsp:remove/> but all it does is to remove the bean from the scope and not actualy destroying it. I have to notify the application bean that the session is terminated so I manualy remove it from its vector list.
But when a user just leave the site without using the logout option, it becomes a problem. Is there a way to actualy tell when a session bean is being destroyed ? I tried to check with my application bean if there are null beans in the list but it never happens, the user bean always stays in memory.
Is there actualy a way for me to notify the application bean when the user quits the website without using the logout link ? Or is the whole design flawed ?
Thanks in advance.
Nicolas Jaccard

I understand I could create a listener even with my current setup Correct, you configure listeners in web.xml and they are applicable to a whole web application irrespective of whether you use jsp or servlets or both. SessionListeners would fire when a session was created or when a session is about to be dropped.
but I do not know how I could get a reference of the application bean in >question. Any hint ?From your earlier post, I understand that you add a UserBean to a session and then the UserBean to a vector stoed in application scope.
Something like below,
UserBean user = new UserBean();
//set bean in session scope.
session.setAttribute("user", user);
//add bean to a Vector stored in application scope.
Vector v = (Vector)(getServletContext().getAttribute("userList"));
v.add(user);If you have done it in the above fashion, you realize, dont you, that its the same object that's added to both the session and to the vector stored in application scope.
So in your sessionDestroyed() method of your HttpSessionListener implementation,
void sessionDestroyed(HttpSessionEvent event){
     //get a handle to the session
     HttpSession session = event.getSession();
      //get a handle to the user object
      UserBean user = (UserBean)session.getAttribute("user");
       //get a handle to the application object
      ServletContext ctx = session.getServletContext();
       //get a handle to the Vector storing the user objs in application scope
        Vector v = (Vector)ctx.getAttribute("userList");
       //now remove the object from the Vector passing in the reference to the object retrieved from the Session.
        v.removeElement(user);
}That's it.
Another approach would be to remove the User based on a unique identifier. Let's assume each User has a unique id (If your User has no such feature, you could still add one and set the user id to the session id that the user is associated with)
void sessionDestroyed(HttpSessionEvent event){
     //get a handle to the session
     HttpSession session = event.getSession();
      //get a handle to the user object
      UserBean user = (UserBean)session.getAttribute("user");
       //get the unique id of the user object
       String id = user.getId();
       //get a handle to the application object
      ServletContext ctx = session.getServletContext();
       //get a handle to the Vector storing the user objs in application scope
        Vector v = (Vector)ctx.getAttribute("userList");
       //now iterate all user objects in the Vector
       for(Iterator itr = v.iterator(); itr.hasNext()) {
               User user = (User)itr.next();
                if(user.getId().equals(id)) {
                       //if user's id is same as id of user retrieved from session
                       //remove the object
                       itr.remove();
}Hope that helps,
ram.

How to understand the strange parameter values shown by 'pstack core'

I encounterred a problem that led to a core dump. I use 'pstack core' to shown the calling stack.
However I could hardly understand some of the parameter values below:
core 'core.150108' of 5016: cmcfun
ff1e1370 __1cLComEndPointFsendv6MpnFiovec_i_i_ (c, ffbfedf8, 2, 2, c, 0) + 4
Why did the 'this' pointer of the instance of class ComEndPoint become 0xc? I don't think it is a valid value of pointer. Does anybody have any idea about this problem?
ff1e5b00 __1cYComTransaction_Icallback6FpnPpdo_transaction_pcii_v_ (6ab90, 0, 0, 0, ffbff1b8, 0) + dc
According to the source code, the 3rd parameter in the function below, which value is 0x66, was not changed in the scope of the function. However it became 0x0 when it was used as the 4th parameter to call the function above. What't the matter?
ff1528e8 pdo_dispatch (6ab90, ad, 66, 0, 0, 0) + dc
I heard that Sun C++ uses 'register windows' to pass the parameters, i0~i5 are used for the first 6 ones. Somebody told me that what I saw in the pstack might not be creditable because the registers might be changed within the function. Is that so? Would anybody plz tell me more details?
Thanks in advance.
Edited by: DirtyBear on Feb 15, 2008 1:17 AM

Register windows are a property of the SPARC computer architecture, not a property of a compiler. SPARC has multiple sets of registers. The function call instruction advances the "register window" to reveal the next set of registers, if there is one. If not, the registers are spilled to the stack to free up a window. The function return instruction moves the window back. (It's a purely hardware feature.) Eight of the registers in adjacent windows overlap, the origin of the "window" term. Registers %o0 thorugh %o7 in the caller become registers %i0 through %i7 in the called function.
On SPARC and x64, some function arguments are passed in registers, depending on how many arguments there are and their types. (The x86 architecture has no registers available for passing arguments.) On entry to a function, the parameters passed in registers might be saved on the stack, but do not necessarily need to be saved on SPARC. The Solaris ABI requires that space for the registers be allocated, but the space is not necessarily used.
In a core dump, the actual registers, particularly for functions other than the current one, are not available. The pstack operation doesn't know how many parameters a function has or what type they are. It shows the contents of the first 6 words on the stack that would hold arguments, if there were arguments, and if they were actually saved on the stack.
In optimized code on any platform, the stack area for a variable or argument is not kept up to date. Computations are kept in registers to the extent possible, and saved in memory only when necessary.
On SPARC in particular, the argument values shown in a stack trace need not be accurate.

How to get detailStamp working in an af:table when using request scope ?

<af:table var="row" id="t1" value="#{listUsers.users}" summary="Userlist" binding="#{listUsers.ATable}" [...]
<af:column sortable="false" headerText="Username" id="c13" filterable="true">
<af:outputText value="#{row.username}" id="ot13"/>
</af:column>
<f:facet name="detailStamp">
<af:panelFormLayout rows="4" labelWidth="33%" fieldWidth="67%" inlineStyle="width:795px" id="pfl1" labelAlignment="start" >
<af:group id="g1">
<af:panelLabelAndMessage id="plamNumber" label="Number" for="number">
<af:outputText value="#{row.address.number}" id="number"/>
</af:panelLabelAndMessage>
I feel there is nothing special with this.
But I've tested with 2 rows in my table and when I disclose rows, I get random results :
sometimes I get the details related to the row disclosed, but sometimes I get the details of the other row.
I've read several posts on the subject but none really helpful.
Another problem ; I've noticed that when I disclose or close a row, getUsers() is called, this method fetch the data from the DB, any way to prevent it ?
For the second problem, the solution I see would be to : change scope of listUsers to session instead of request, fetch from the DB only when "refresh", not when "detailStamp",
but I've no clue on how to actually do the "only when part"
Thanks in advance,
JP

Ok when I change the scope of ListUsers to session it's "ok" since I only load the list from the DB once (just like the demo that does not have this problem since the demo does not use the DB)
When I change the scope for request and that the page is refreshed then the object ListUsers is "recreated" and the data reloaded : that's the expected behavior
So I prefer to have the scope sets to request
The problem is that when a user disclose/close a detailstamp and that the scope is set to request,
then the data is reloaded from the DB
because apparently this event acts like a "refresh"
because this event (disclose/close) cause the destruction of what is in the request scope ...
That's my understanding, probably few mistakes, I'm beginning with ADF/JSF
It seems that when I load the data from the DB, it's not always in the same order, causing the problem itself probably, which is not ADF related BUT ;
what I would like to know is how to (elegantly) prevent the event of "disclose/close" to act like a "refresh" ?
Because even if I fix the "not ADF related problem" (if there is one), loading the list from the DB each time, appears really useless and the DBA won't like me !
A solution could be to leave the session scope, but then my question would be ;
*how to know I've to reload from the DB ?"
I could just "reload it on page load", seems ok to me but
I'm not sure it's the best, I would like to have your opinion, I've found this article for the "on page load" part ;
http://groundside.com/blog/DuncanMills.php?title=adf_executing_code_on_page_load&more=1&c=1&tb=1&pb=1
Thanks,
JP

Search scopes taking long time to load SharePoint 2010

Hi!
It takes very long time (more than 5-10 mins) for the Search Scopes page to load. This is very annoying and proves to be very much NON-productive while working on search related tasks.
Please help if you came across any such issue.
Thanks,
Owens G. Jesse

Hi Owens ,
According to your description, my understanding is that only your Search Scopes page loads very slowly.
For your issue , you can enable Developer Dashboard for SharePoint 2010 with PowerShell first.
With Developer Dashboard, you can find out where the Search Scopes page loading time was spent at server side.
Reference:
http://blogs.technet.com/b/patrick_heyde/archive/2009/11/16/sharepoint-2010-enable-using-developer-dashboard.aspx
Please inform me freely if you have any questions.
Thanks

Validation error while trying to change a value in a request scope bean

- JBoss 4.2.3.GA
- JSF 1.2_09-b01-BETA1 (Mojarra)
- Java 5 Update 17
Hello, everybody!
I'm having the following problem in my JSF web application:
I have a request scope backing bean. The first time this bean is loaded (I check
this with the ResponseStateManager.isPostBack() method) I fill a list of SelectItem
instances that are to be displayed in the JSF page in a +<h:selectOneMenu>+ component.
The list goes, of course, to the +<h:selectOneMenu>+'s +<f:selectItems>+ facet child
component. In the constructor I also define the value that goes to the value property
of the +<h:selectOneMenu>+ component. This value is a property in the backing bean, as
is the list of SelectItem instances. Until now we have something like this:
The backing bean declaration in faces-config.xml:
<managed-bean>
    <managed-bean-name>solicitacaoGeral</managed-bean-name>
    <managed-bean-class>br.urca.solicitacoes.web.PaginaSolicitacaoGeral</managed-bean-class>
    <managed-bean-scope>request</managed-bean-scope>
</managed-bean>
The relevant parts of the JSF page:
<h:form id="form">
    <h:selectOneMenu value="#{solicitacaoGeral.setorOrigem}" id="foco">
        <f:selectItems value="#{solicitacaoGeral.setoresOrigem}" />
    </h:selectOneMenu>
</h:form>
The relevant parts of the backing bean class:
public class PaginaSolicitacaoGeral
    private final List<SelectItem> fSetoresOrigem = new ArrayList<SelectItem>();
    private Setor fSetorOrigem;
    public PaginaSolicitacaoGeral()
        if (primeiraExibicao()) // First load (!ResponseStateManager.isPostBack())
            // Fill fSetoresOrigem...
            fSetorOrigem = ...
        else // Page submitted
            // Read below...
    public List<SelectItem> getSetoresOrigem()
        return fSetoresOrigem;
    public Setor getSetorOrigem()
        return fSetorOrigem;
    public void setSetorOrigem(Setor setorOrigem)
        fSetorOrigem = setorOrigem;
    private boolean primeiraExibicao()
        String idFerramentaExibicao =
            FacesContext.getCurrentInstance().getViewRoot().getRenderKitId();
        ResponseStateManager gerenciadorEstadoResposta =
            RenderKitUtils.getResponseStateManager(
            FacesContext.getCurrentInstance(), idFerramentaExibicao);
        return !gerenciadorEstadoResposta.isPostback(
            FacesContext.getCurrentInstance());
}But when the user submits the form and the bean constructor is called again
(this time the method ResponseStateManager.isPostBack() returns true ),
in the else block in the constructor above, I need to fill fSetoresOrigem with
other values and also the fSetorOrigem field because, of course, the fSetorOrigem
field has to be a valid value that exists in the new fSetoresOrigem list.
JSF is not complaining about the change to the list items, but it is complaining
to the change to the fSetorOrigem field (the list value), even though it is a
valid value present in the list. So I'm getting this error message:
08:23:54,312 INFO [lifecycle] WARNING: FacesMessage(s) have been enqueued, but may not have been displayed.
sourceId=form:foco[severity=(ERROR 2), summary=(form:foco: Validation Error: Value is not valid), detail=(form:foco: Validation Error: Value is not valid)]I suppose that JSF is comparing the new value of the field fSetorOrigem with the value
it has in the view state. As the value is different it is raising the error. That's
what I suppose. But am I not able the change the value in the postback? I've already
checked and the value is valid. It corresponds to a value that exists in the list.
I really need a solution to this problem as I'm stuck with this and can't proceed until
I find a solution to this. What I am doing wrong and how can I solve this?
Thank you very much.
Marcos

BalusC wrote:
It is comparing the selected value against the List<SelectItem> returned by getSetoresOrigem() as it is during the apply request values phase of the form submit request.Ok. That's what I supposed JSF was doing.
BalusC wrote:
If the selected value isn't in there, then you will get this error.I can understand this, but is this right? As I said, the old value isn't really there because I changed the list values to new ones. But the new value (the value of fSetorOrigem ) corresponds to a value that exist in the new list items, so a valid value. So JSF is not considering that I also changed the list, not just the value. It is comparing the new value with the old list, not the new one. Acting like this JSF is making the page looks like a static HTML page, not a dynamic one. If I can't change the list and the value, what's the point of that? In my point of view I'm not doing anything wrong, I'm not violating any JSF rules.
Marcos

Understanding Scope

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