Confusion about LabelValueBean class

hi all,
Can anybody tell me what is the functionality of LabelValuBean class in struts?Where it can be used?A code example will be very helpful
thanks in advance

A simple JavaBean to represent label-value pairs. This is most commonly used when constructing user interface elements which have a label to be displayed to the user, and a corresponding value to be returned to the server. One example is the <html:options> tag.

Similar Messages

Confused about instances/classes

I'm trying to write a war simulation. I have a Soldier class and then a RedSoldier and BlueSoldier which extend the Soldier class. Here are pertinent methods from my Soldier class.
protected Location nextLocation() //hunts and eats closest fish
        Soldier f = findClosest();
        System.out.println(f);
          if(f!=null)
             Location nextLoc = environment().getNeighbor(this.location(),environment().getDirection(this.location(),f.location()));
             if (nextLoc.equals(f.location()))
                  System.out.println("killing");
                  kill(f);
             if (environment().isEmpty(nextLoc))
                  return nextLoc;
        return super.nextLocation();
     protected void kill(Soldier f)
          environment().remove(f);
     }It will always call the kill method in the soldier class. Is there a way I can tell if the soldier is of type Red or Blue and then call the kill method in the red or blue classes respectively? I was thinking something like this.getClass().kill(f); if thats a real method so it will call the correct method from the correct class?

should a soldier really be killing itself?This depends completely on what "kill" is supposed to do. If kill means "stab that other guy in the chest with a bayonet", then kill() nmight take a parameter of which other guy. But if kill means "you are now being stabbed in the chest with a bayonet, so keel over and die", then there might not be any parameter you need to give it.
Consider the close() method in Streams. When you tell an InputStream to close(), you are not telling it to "go over there and close that other InputStream". You're telling IT to close itself, shutting itself down, and keeling over dead - as though stabbed in the chest with a bayonet.
Also consider, if kill() means to go kill another soldier, then you still may need SOME method in the other soldier that tell him he's being killed...or not, depending on your design of soldier. You might design your squadron of soldier so that killing a soldier simply means removing it from the list of living soldiers.

Confused about extending the Sprite class

Howdy --
I'm learning object oriented programming with ActionScript and am confused about the Sprite class and OO in general.
My understanding is that the Sprite class allows you to group a set of objects together so that you can manipulate all of the objects simultaneously.
I've been exploring the Open Flash Chart code and notice that the main class extends the Sprite class:
public class Base extends Sprite {
What does this enable you to do?
Also, on a related note, how do I draw, say, a line once I've extended it?
Without extending Sprite I could write:
var graphContainer:Sprite = new Sprite();
var newLine:Graphics = graphContainer.graphics;
And it would work fine. Once I extend the Sprite class, I'm lost. How do I modify that code so that it still draws a line? I tried:
var newLine:Graphics = this.graphics;
My understanding is that since I'm extending the Sprite class, I should still be able to call its graphics method (or property? I have no idea). But, it yells at me, saying "1046: Type was not found or was not a compile-time constant: Graphics.

Thanks -- that helped get rid of the error, I really appreciate it.
Alas, I am still confused about the extended Sprite class.
Here's my code so far. I want to draw an x-axis:
package charts {
    import flash.display.Sprite;
    import flash.display.Graphics;
    public class Chart extends Sprite {
        // Attributes
        public var chartName:String;
        // Constructor
        public function Chart(width:Number, height:Number) {
            this.width = width;
            this.height = height;
        // Methods
        public function render() {
            drawAxis();
        public function drawAxis() {
            var newLine:Graphics = this.graphics;
            newLine.lineStyle(1, 0x000000);
            newLine.moveTo(0, 100);
            newLine.lineTo(100, 100);
I instantiate Chart by saying var myChart:Chart = new Chart(); then I say myChart.render(); hoping that it will draw the axis, but nothing happens.
I know I need the addChild method somewhere in here but I can't figure out where or what the parameter is, which goes back to my confusion regarding the extended Sprite class.
I'll get this eventually =)

Confuse about the injecting entity in EJB 3.0?

Hi all,
I have an customersBean which is inherit from customersRemote and my problem is i' am little confuse about injecting the entity(customer).
Where can you apply the EntityManagerFactory is it outside on EJB or Inside the EJB? means outside EJB is use the web application or java application. i have and example.
this is inside on EJB...............
public class CustomersBean implements com.savingsaccount.session.CustomersRemote {
@PersistenceContext(unitName="SavingAccounts")
EntityManagerFactory emf;
EntityManager em;
/** Creates a new instance of CustomersBean */
public CustomersBean() {
public void create(int id, String name, String address, String telno, String mobileno)
try{
//This is the entity.
Customer _customer = new Customer();
_customer.setId(id);
_customer.setName(name.toString());
_customer.setAddress(address.toString());
_customer.setTelno(telno.toString());
_customer.setMobileno(mobileno.toString());
em = emf.createEntityManager();
em.persist(_customer);
emf.close();
}catch(Exception ex){
throw new EJBException(ex.toString());
in web application, i'm using the @EJB in customer servlets.
public class CustomerProcessServlet extends HttpServlet {
@EJB
private CustomersRemote customerBean;
blah blah inject directly coming request field from jsp.
}

Hi all,
I have an customersBean which is inherit from customersRemote and my problem is i' am little confuse about injecting the entity(customer).
Where can you apply the EntityManagerFactory is it outside on EJB or Inside the EJB? means outside EJB is use the web application or java application. i have and example.
this is inside on EJB...............
public class CustomersBean implements com.savingsaccount.session.CustomersRemote {
@PersistenceContext(unitName="SavingAccounts")
EntityManagerFactory emf;
EntityManager em;
/** Creates a new instance of CustomersBean */
public CustomersBean() {
public void create(int id, String name, String address, String telno, String mobileno)
try{
//This is the entity.
Customer _customer = new Customer();
_customer.setId(id);
_customer.setName(name.toString());
_customer.setAddress(address.toString());
_customer.setTelno(telno.toString());
_customer.setMobileno(mobileno.toString());
em = emf.createEntityManager();
em.persist(_customer);
emf.close();
}catch(Exception ex){
throw new EJBException(ex.toString());
in web application, i'm using the @EJB in customer servlets.
public class CustomerProcessServlet extends HttpServlet {
@EJB
private CustomersRemote customerBean;
blah blah inject directly coming request field from jsp.
}

Confusion about Kodo and JCA

Hi,
I'm a bit confused about Kodo's Connection Architecture strategy. It is my understanding that
PMF's can be built to use the connection architecture. Along this line, one would configure the
ConnectionFactory or ConnectionFactoryName, and possibly the ConnectionFactory2 and
ConnectionFactory2Name properties in a PMF. The result of the PMF implementation supporting the
connection architecture is nice integration with the application servers in terms of security,
transaction, and connection management. One can lookup in JNDI a reference to a Kodo PMF that
supports datastore transactions or to another one that supports optimistic transactions or to
another one that supports NTR, and with proper settings of the transactional properties and suitable
application code, one's sesson bean will work.
But from what I can see of Kodo's JDOPersistenceManagerFactory class, it, itself, implements the
ManagedConnectionFactory interface, meaning, I think, that this class is resource adaptor. And that
the part that confuses me. Why would Kodo be a resource adaptor? I thought it used a resource
adaptor, which I think is the same thing as a connection factory.
Anyway, I'm puzzled, and I'm hoping that someone could straighten me out.
David Ezzio

David-
The fact that Kodo can integrate into an application server as a
Resource Adaptor, and section 3.2.2 of the specification that says that
the PersistentManagerFactory should be able to utilize a Resource
Adaptor to obtain connections to the data store are two separate issues.
We implement Kodo itself as a Resource Adaptor in order to provide ease
of integration into recent application servers. Your confusion is
understandable, since we do not actually yet support the use of Resource
Adaptors as the Connection Factories as per section 3.2.2.
Does that make sense?
David Ezzio <[email protected]> wrote:
Hi,
I'm a bit confused about Kodo's Connection Architecture strategy. It is my understanding that
PMF's can be built to use the connection architecture. Along this line, one would configure the
ConnectionFactory or ConnectionFactoryName, and possibly the ConnectionFactory2 and
ConnectionFactory2Name properties in a PMF. The result of the PMF implementation supporting the
connection architecture is nice integration with the application servers in terms of security,
transaction, and connection management. One can lookup in JNDI a reference to a Kodo PMF that
supports datastore transactions or to another one that supports optimistic transactions or to
another one that supports NTR, and with proper settings of the transactional properties and suitable
application code, one's sesson bean will work.
But from what I can see of Kodo's JDOPersistenceManagerFactory class, it, itself, implements the
ManagedConnectionFactory interface, meaning, I think, that this class is resource adaptor. And that
the part that confuses me. Why would Kodo be a resource adaptor? I thought it used a resource
adaptor, which I think is the same thing as a connection factory.
Anyway, I'm puzzled, and I'm hoping that someone could straighten me out.
David Ezzio--
Marc Prud'hommeaux [email protected]
SolarMetric Inc. http://www.solarmetric.com
Kodo Java Data Objects Full featured JDO: eliminate the SQL from your code

Confused about conversation grouping Lion vs. Snow Leopard

Hello All,
I just upgraded. Literally just finished. I was checking out mail, and I am confused about how Mail 5 groups messages for conversations. In SL I had Mail group related messages as well, and it's a feature I really enjoy. Conversations just makes it that much better. But, I notice that Lion groups message differently than both SL and iOS. Now, it is no longer grouping emails that are all from various people but are part of the same thread. It is grouping multiple messages from the same sender, even if they have nothing to do with each other, or are only loosely connected.
It used to be (and still is on my iPhone) for example, that all the emails eminating from a single thread topic on one of my class forums would all group together. They have the same subject line and formatting. It was heaven. Will there be no way of doing this?
Also, now all the emails from the teacher of that class, regardless of the relevancy or subject line, group together in one conversation. It's annoying in a way, but I think I can get used to that. Does anyone know if these will be able to be changed in the future?
Thanks

As a Mac power user - LION IS A DISAPPOINTMENT
Apple needs to seriously consider briniging back
• SPACES: the capability to move up as well as down to access applications
     AND have applications stay in a desgnated space makes it much easier
     to run multiple applicatioins - especially in a multi-monitor environment
• SAVE AS: Saving various versions of a file is difficult with Lion.
    If I want a 3 versions of a document - with different pictures, it takes too many "clicks" to accomplish
     this task. LET ME CHOOSE HOW I STORE FILES
• COPY COMMAND: Snow Leaopard allowed me to copy files to a storage device AND if the file
     was already written to the device - the option to NOT REPLACE the file existed. This made it
     easy to backup work on a portable drive.
     LION ONLY has two options - copy all or make an addition copy of the file, causing storage bloat
APPLE NEEDS TO SERIOUSLY CONSIDER PUTTING THESE FEATURES BACK INTO THEIR OS FOR THE BUSINESS AND POWER USER

Udev: confusion about identifier ATTRS{idProduct}

Hi,
i'm confused about how exactly udev identifies a device, imho the idProduct identifier is (in this specific case) inconsistent.
Short story:
'lsusb' and 'udeadm info' indentify the devices idProduct as "1002", but to get udev rules working i have to use ATTRS{idProduct}=="1001" though.
Long story:
I have this usb-to-midi device (midisport 2x2), which needs to load firmware to work (midisport-firmware). This is the udev rule to load the firmware:
#/etc/udev/rules.d/42-midisport-firmware.rules
# MidiSport 2x2
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="0763", ATTRS{idProduct}=="1001", RUN+="/sbin/fxload -s /usr/share/usb/maudio/MidiSportLoader.ihx -I /usr/share/usb/maudio/MidiSport2x2.ihx -D %N"
This rule ("idProduct=1001") works!
Changing "idProduct" to "1002" does not work.
However, here's the output of
~# lsusb
Bus 003 Device 007: ID 0763:1002 Midiman MidiSport 2x2
and
~# udevadm info -a -p /sys/bus/usb/devices/usb3/3-2/
looking at device '/bus/usb/devices/usb3/3-2':
KERNEL=="3-2"
SUBSYSTEM=="usb"
DRIVER=="usb"
ATTR{configuration}==""
ATTR{bNumInterfaces}==" 1"
ATTR{bConfigurationValue}=="1"
ATTR{bmAttributes}=="a0"
ATTR{bMaxPower}==" 0mA"
ATTR{urbnum}=="13"
ATTR{idVendor}=="0763"
ATTR{idProduct}=="1002"
ATTR{bcdDevice}=="0121"
ATTR{bDeviceClass}=="00"
ATTR{bDeviceSubClass}=="00"
ATTR{bDeviceProtocol}=="00"
ATTR{bNumConfigurations}=="1"
ATTR{bMaxPacketSize0}=="64"
ATTR{speed}=="12"
ATTR{busnum}=="3"
ATTR{devnum}=="7"
ATTR{devpath}=="2"
ATTR{version}==" 1.00"
ATTR{maxchild}=="0"
ATTR{quirks}=="0x0"
ATTR{avoid_reset_quirk}=="0"
ATTR{authorized}=="1"
looking at parent device '/devices/pci0000:00/0000:00:1a.0/usb3':
KERNELS=="usb3"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="e0"
ATTRS{bMaxPower}==" 0mA"
ATTRS{urbnum}=="145"
ATTRS{idVendor}=="1d6b"
ATTRS{idProduct}=="0001"
ATTRS{bcdDevice}=="0302"
ATTRS{bDeviceClass}=="09"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="12"
ATTRS{busnum}=="3"
ATTRS{devnum}=="1"
ATTRS{devpath}=="0"
ATTRS{version}==" 1.10"
ATTRS{maxchild}=="2"
ATTRS{quirks}=="0x0"
ATTRS{avoid_reset_quirk}=="0"
ATTRS{authorized}=="1"
ATTRS{manufacturer}=="Linux 3.2.9-1-ARCH uhci_hcd"
ATTRS{product}=="UHCI Host Controller"
ATTRS{serial}=="0000:00:1a.0"
ATTRS{authorized_default}=="1"
looking at parent device '/devices/pci0000:00/0000:00:1a.0':
KERNELS=="0000:00:1a.0"
SUBSYSTEMS=="pci"
DRIVERS=="uhci_hcd"
ATTRS{vendor}=="0x8086"
ATTRS{device}=="0x2937"
ATTRS{subsystem_vendor}=="0x17aa"
ATTRS{subsystem_device}=="0x20f0"
ATTRS{class}=="0x0c0300"
ATTRS{irq}=="16"
ATTRS{local_cpus}=="ff"
ATTRS{local_cpulist}=="0-7"
ATTRS{dma_mask_bits}=="32"
ATTRS{consistent_dma_mask_bits}=="32"
ATTRS{enable}=="1"
ATTRS{broken_parity_status}=="0"
ATTRS{msi_bus}==""
looking at parent device '/devices/pci0000:00':
KERNELS=="pci0000:00"
SUBSYSTEMS==""
DRIVERS==""
which both indicate, the correct idProduct would be "1002"!?
The midisport box is the only device where this inconsistence appears, all other usb-devices (hdds, sticks, sound card, dvb-t stick, mp3 player) get identified as expected.
I want to know, if anybody can explain this/ if anybody has had similar experiences!

Looking at the udevadm info output, it shows ATTR{idproduct}=="1002" and ATTRS{idproduct}=="0001" and your rule uses ATTRS{idproduct}=="1001".
Have you tried with just ATTR{idproduct}=="1002" (note no S)? Looking at the output of info, I would still not expect ATTRS{idproduct}=="1001" to work, but udev's changed a fair bit in the last few years and the old bible for rules is way out of date.

Confused about update method in JComponents

Hello,
I'm a bit confused about the update method in JComponents. What I remember from applets was that the update method was called whenever something changed such as a window being dragged across it or something.
I've written a class that extends a JPanel and overwrites the paint method. Any components I add to it aren't drawn. I can add JComponent.update() methods to my paint() method but this is very inefficient as I'm having repaint() called by a thread 15 times a second. I tried to put the update methods in the JPanels update() but that doesn't work, in fact update isn't called at all. What does update do ?

Let me take another crack at it...
1) Grab the 9.2.0.8 patchset for the Oracle database (i.e. patch 4547809 on Metalink assuming you're using 32-bit Windows). Install this to upgrade your Oracle client to 9.2.0.8. Installation instructions are in the README.
2) Grab the 9.2.0.8 Oracle ODBC driver, which you already appear to have, and follow the installation instructions in the README you're looking at.
Justin

Confused about JTable::setCellEditor

Hi
I'm a bit confused about what JTable::setCellEditor does.
I wrote my own TableCellEditor implementation which can handle dates and other additional stuff and which can decide for itself what type of editing control to display.
Now I want my table to use only this editor.
However using
tblTest.setCellEditor( MyEditorInstance );didn't work. But when I used
tblTest.getColumnModel().getColumn(0).setCellEditor( MyEditorInstance );
tblTest.getColumnModel().getColumn(1).setCellEditor( MyEditorInstance );
tblTest.getColumnModel().getColumn(2).setCellEditor( MyEditorInstance );for every column it worked fine.
How can I avoid setting the default editor manually and set it for all columns?
As always, any help is greatly appreciated
Marcus

I agree with you, its not clear what that method does.
If you don't set a cell editor to a column then JTable determines which of its default editors to use based on the Class returned from the getColumnClass() method, which is defined by the JTable and the TableModel. If you are using the default implementation of this method then it will always return Object as the class type. You can use your editor as the default by doing:
table.setDefaultEditor(Object.class, MyEditorInstance);

Confused about how to display a rectangle on JFrame

i'm a little confused about how to display a rectangle on a jframe.
I know there is a class called Rectangle. is there a way to use it to display a rectangle on a JFrame? i couldn't find a way to do that.
i found a way to display a rectangle in the internet:
CODE:
public class RectangleFrame extends JFrame {
    public RectangleFrame() {
        super("My Rectangle");
        setSize(300,400);
        setLocation(300,300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        JButton button = new JButton("Button");
        JPanel panel = new JPanel();
        panel.add(button);
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(new Rect(), BorderLayout.CENTER);
        getContentPane().add(panel, BorderLayout.SOUTH);
        setVisible(true);
    public static void main(String[] args) {
        new RectangleFrame();
public class Rect extends JComponent {
    public void paint(Graphics g) {
        g.drawRect(50,50,200,200);
}is this the only way to do that? isn't there an easier way? do i have to write this new class Rect i wrote?
i don't really know how this Rect class i wrote works. could someone explain?
then another question: can i put a rectangle on a JPanel or do i have to add it directly onto the ContentPane as i did above?
i hope everything i asked is clear enough.
thanks for your effort.

Take a look at the 2D graphics tutorial:
http://java.sun.com/docs/books/tutorial/2d/index.html

I am confused about something. How do I read a book on my MacBook Pro? I can't find the iBook app anywhere, which is what I use on my iPad. The book I want to read is in my iTunes but I can't click on it. My iBook library does not show up in iTunes.

I am confused about something. How do I read a book on my MacBook Pro? I can't find the iBook app anywhere, which is what I use on my iPad. The book I want to read is in my iTunes but I can't click on it. Some of my iBooks show up in my iTunes but they are "grayed" out. The only books that respond in iTunes are audiobooks and that's not what I'm looking for. Is this a stupid question?

Nevermind - I answered my own question, which is I CAN"T READ ANY BOOKS I purchased in iBooks on my MacBook Pro. If I want to read on my mac I have to use Kindle or Nook. Which means any book I've already purchased through iBooks has to be read on my iPad. Kind of a drag because there are times when it's more convenient for me to read while I'm sitting with my Mac.

Confused about logical table source

Hi,
I'm confused about logical table source(LTS), there are 'General', 'Column Mapping', 'Content' tabs in
LTS, in General tab ,there are some information,like 'Map to there tables' and 'joins',
just here, we have created relationships in physical layer and BMM layer, so I would like to ask what's the use of the 'joins' here?

Hi Alpha,
Valid query, when you establish a complex join it is always between a logical fact and dimension table.Consider a scenario,
Example:w_person_dx is an extension table not directly joined to a fact but joins to a dimension w_person_d.
When you model the person_d tables in BMM, you ll have a single logical table with w_person_d as source.If you have to pull columns from both w_person_d and w_person_dx tables in a report, you add dx table as inner join to persond table in the general tab.Now when you check your physical query, you can see the inner join fired between the two dimensions.
Rgds,
Dpka

Confused about transaction, checkpoint, normal recovery.

After reading the documentation pdf, I start getting confused about it's description.
Rephrased from the paragraph on the transaction pdf:
"When database records are created, modified, or deleted, the modifications are represented in the BTree's leaf nodes. Beyond leaf node changes, database record modifications can also cause changes to other BTree nodes and structures"
"if your writes are transaction-protected, then every time a transaction is committed the leaf nodes(and only leaf nodes) modified by that transaction are written to JE logfiles on disk."
"Normal recovery, then is the process of recreating the entire BTree from the information available in the leaf nodes."
According to the above description, I have following concerns:
1. if I open a new environment and db, insert/modify/delete several million records, and without reopen the environment, then normal recovery is not run. That means, so far, the BTree is not complete? Will that affact the query efficiency? Or even worse, will that output incorrect results?
2. if my above thinking is correct, then every time I finish commiting transactions, I need to let the checkpoint to run in order to recreate the whole BTree. If my above thinking is not correct, then, that means that, I don't need to care about anything, just call transaction.commit(), or db.sync(), and let je to care about all the details.(I hope this is true :>)
michael.

http://www.oracle.com/technology/documentation/berkeley-db/je/TransactionGettingStarted/chkpoint.html
Checkpoints are normally performed by the checkpointer background thread, which is always running. Like all background threads, it is managed using the je.properties file. Currently, the only checkpointer property that you may want to manage is je.checkpointer.bytesInterval. This property identifies how much JE's log files can grow before a checkpoint is run. Its value is specified in bytes. Decreasing this value causes the checkpointer thread to run checkpoints more frequently. This will improve the time that it takes to run recovery, but it also increases the system resources (notably, I/O) required by JE.
"""

To ragnic and other about Singleton class

Hi ragnic. Thanks for your reply. I posted the code wrong. Heres' my correct one.
I have a GUI first loaded information and the information is stored in a databse, I have some EJB classes..and my singleton class ABC has some method to access to the EJB..
so my first GUI will gather info using singleton class and later if I click on
a button in my first GUI class, will pop up another frame of another class , this class also need to class setPassword in my Singleton..
are my followign codes correctly??
iS my Class ABC a SINgleton class? thanks
Is my class ABC use as single correctly. And It is called from other classes is also correct?
I'm new to java and like to learn about Singleton class.
But I really dont' understand it clearly after reading many examples of it.
I have a project to convert my class abc to a singleton.
But I dont know how to do it.
In my class(soon will become a singleton) will have few methods that later I need to use it from another class A and class B.
I have a GUI application that first load my class A..and my class will call
class abc(singleton) to get some information from it.
and then in class A has a button, if I click on that button I will call SIngleton class again to update my password, in the singleton class has method calls updatePassword. But I dont know how to call a singleton from other class.
I have my code for them below:
1)public class ABC //attempt using a singleton
private static ABC theABC = null;
private ABC(){}
public synchronized static ABC getABC()
if(theABC == null)
theABC= new ABC();
return the ABC;
public void updateUserInfo(SimpleUser user)
throws UserNotFoundException, DelegateException
try
UserCollectionHome userCollectionHome = (UserCollectionHome)
EJBHomeFactory.getFactory().lookupHome("vista/UserCollection",
UserCollectionHome.class);
UserHome userHome = (UserHome)
EJBHomeFactory.getFactory().lookupHome("vista/User",UserHome.class);
UserCollection uc = userCollectionHome.create();
uc.updateUserInfo(user, userHome);
} catch(HomeFactoryException hfe) {
hfe.printStackTrace();
throw new DelegateException(hfe);
} catch(RemoteException re) {
re.printStackTrace();
throw new DelegateException(re);
} catch(CreateException ce) {
ce.printStackTrace();
throw new DelegateException(ce);
} catch(FinderException fe) {
fe.printStackTrace();
throw new UserNotFoundException();
public SimpleUser getID(String id)
throws UserNotFoundException, DelegateException
try
UserCollectionHome userCollectionHome = (UserCollectionHome)
EJBHomeFactory.getFactory().lookupHome("vista/UserCollection",
UserCollectionHome.class);
UserHome userHome = (UserHome)
EJBHomeFactory.getFactory().lookupHome("vista/User",UserHome.class);
UserCollection uc = userCollectionHome.create();
SimpleUser su = uc.getID(id, userHome);
return su;
} catch(HomeFactoryException hfe) {
throw new DelegateException(hfe);
} catch(RemoteException re) {
throw new DelegateException(re);
} catch(CreateException ce) {
throw new DelegateException(ce);
} catch(FinderException fe) {
throw new UserNotFoundException();
public void setPassword(String lname,String pw)
throws UserNotFoundException, DelegateException
try
UserCollectionHome userCollectionHome = (UserCollectionHome)
EJBHomeFactory.getFactory().lookupHome("vista/UserCollection",
UserCollectionHome.class);
UserHome userHome = (UserHome)
EJBHomeFactory.getFactory().lookupHome("vista/User",UserHome.class);
UserCollection uc = userCollectionHome.create();
uc.setPassword(lname,pw, userHome);//assume that all lname are differents.
} catch(HomeFactoryException hfe) {
hfe.printStackTrace();
throw new DelegateException(hfe);
} catch(RemoteException re) {
re.printStackTrace();
throw new DelegateException(re);
} catch(CreateException ce) {
ce.printStackTrace();
throw new DelegateException(ce);
} catch(FinderException fe) {
fe.printStackTrace();
throw new UserNotFoundException();
}//Do I have my class as a Singleton correctly???
2)//Here is my First Frame that will call a Singleton to gather user information
public A(Frame owner)
super(owner, "User Personal Information",true);
initScreen();
loadPersonalInfo();
* This method instantiates all the GUI widgets and places them into panels and
* onto the frame.
private void initScreen()
txtFname = new JTextField(20);
txtLname=new JTextField(20);
btnsave =new JButton("Save");
btnChange= new JButton("Click here to change PW");//when you click this button there will be a frame pop up for you to enter informaton..this iwll call class B
JPanel pnlMain=new JPanel();
JPanel pnlFname= new JPanel();
pnlFname.setLayout(new BoxLayout(pnlFname, BoxLayout.X_AXIS));
pnlFname.setBorder(BorderFactory.createEmptyBorder(0,87,0,90));
pnlFname.add(new JLabel("First Name:"));
pnlFname.add(Box.createRigidArea(new Dimension(5,0)));
pnlFname.add(txtFname);
JPanel pnlLname= new JPanel();
pnlLname.setLayout(new BoxLayout(pnlLname, BoxLayout.X_AXIS));
pnlLname.setBorder(BorderFactory.createEmptyBorder(0,87,0,90));
pnlLname.add(new JLabel("Last Name:"));
pnlLname.add(Box.createRigidArea(new Dimension(5,0)));
pnlLname.add(txtLname);
pnlMain.add(pnlFname);
pnlMain.add(pnlLname);
pnlMain.add(btnsave);
pnlMain.add(btnChange");
btnSave = new JButton("Save");
btnSave.setActionCommand("SAVE");
btnSave.addActionListener(this);
btnCancel = new JButton("Cancel");
btnCancel.setActionCommand("CANCEL");
btnCancel.addActionListener(this);
JPanel pnlBottom = new JPanel();
pnlBottom.setLayout(new BoxLayout(pnlBottom, BoxLayout.X_AXIS));
pnlBottom.setBorder(BorderFactory.createEmptyBorder(25,55,0,0));
pnlBottom.add(btnSave);
pnlBottom.add(Box.createRigidArea(new Dimension(25,0)));
pnlBottom.add(btnCancel);
pnlMain.add(pnlBottom);
this.setContentPane( pnlMain);
setSize(500,500);
GraphicUtilities.center(this);
theABC=ABC.getABC();
//Do I call my ABC singleton class correctly??
private void loadPersonalInfo()
String ID= System.getProperty("user.name");
SimpleUser user = null;
try {
user = ABC.getID(ID);
//I tried to use method in ABC singleton class. IS this correctly call?
} catch(UserNotFoundException nfe)
JOptionPane.showMessageDialog(new JDialog(),"You have not yet registered.",
"User Not Found",JOptionPane.WARNING_MESSAGE);
System.exit(0);
} catch(DelegateException de) {
JOptionPane.showMessageDialog(new JDialog(),"You have not yet registered",JOptionPane.ERROR_MESSAGE);
System.exit(0);
currentUser = user;
txtFname.setText(currentUser.getFirstName());
txtLname.setText(currentUser.getLastName());
//This information will be display in my textfields Fname and Lname
//I can change my first and last name and hit button SAVE to save
public void actionPerformed(ActionEvent e)
if(e.getActionCommand().equals("SAVE")) submitChanges();
if(e.getActionCommand().equals("CHANGE_PASSWORD")) {
changepassword=new ChangePassword(new Frame(),name,badgeid);
public void submitChanges(){
String currentNTUsername = System.getProperty("user.name");
SimpleUser user =null;
try {
user = theABC.getID(ID);
user.setFirstName(txtFname.getText().trim());
user.setLastName(txtLname.getText().trim());
currentUser = user;
theABC.updateUserInfo(currentUser);
//IS this correctly if I want to use this method in singleton class ABC??
} catch(UserNotFoundException nfe)
JOptionPane.showMessageDialog(new JDialog(),"You have not yet registered",
"User Not Found",JOptionPane.WARNING_MESSAGE);
} catch(DelegateException de) {
JOptionPane.showMessageDialog(new JDialog(),"You have not yet registered",JOptionPane.ERROR_MESSAGE);
System.exit(0);
this.setVisible(false);
3) click on ChangePassword in my above GUI class A..will call this class B..and in this class B
I need to access method in a Singleton class- ABC class,,DO i need to inititates it agian, if not what should I do? thanks
package com.lockheed.vista.userinfo;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import javax.swing.table.*;
import javax.swing.tree.*;
import java.util.StringTokenizer;
import java.util.Vector;
import java.io.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import javax.swing.colorchooser.*;
import javax.swing.filechooser.*;
import javax.accessibility.*;
import java.beans.*;
import java.applet.*;
import java.net.*;
import org.apache.log4j.*;
import com.lockheed.common.gui.GraphicUtilities;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import vista.user.UserServicesDelegate;
import vista.user.SimpleUser;
import vista.user.UserNotFoundException;
import vista.user.*;
import com.lockheed.common.ejb.*;
import com.lockheed.common.gui.*;
import com.lockheed.vista.publish.*;
* This program allow users to change their Vista Web Center's password
public class ChangePassword extends JDialog
implements ActionListener{
protected final Logger log = Logger.getLogger(getClass().getName());
private UserServicesDelegate userServicesDelegate;
private User currentUser = null;
private JPasswordField txtPasswd, txtVerifyPW;
private JButton btnSubmit,btnCancel;
private JLabel lblName,lblBadgeID;
private String strBadgeID="";
* This is the constructor. It creates an instance of the ChangePassword
* and calls the method to create and build the GUI.
public ChangePassword(Frame owner,String name,String badgeid)
super(owner, "Change Password",true);
initScreen(name,badgeid);//build the GUI
* This method instantiates all the GUI widgets and places them into panels and
* onto the frame.
private void initScreen(String strname,String strBadgeid)
txtPasswd = new JPasswordField(20);
txtVerifyPW=new JPasswordField(20);
txtPasswd.setEchoChar('*');
txtVerifyPW.setEchoChar('*');
JPanel pnlMain=new JPanel();
pnlMain.setLayout(new BoxLayout(pnlMain, BoxLayout.Y_AXIS));
pnlMain.setBorder(BorderFactory.createEmptyBorder(20,0,20,0));
JPanel pnlPW=new JPanel();
pnlPW.setLayout(new BoxLayout(pnlPW, BoxLayout.X_AXIS));
pnlPW.setBorder(BorderFactory.createEmptyBorder(0,96,0,30));
pnlPW.add(new JLabel("Password:"));
pnlPW.add(Box.createRigidArea(new Dimension(5,0)));
pnlPW.add(txtPasswd);
JPanel pnlVerifyPW=new JPanel();
pnlVerifyPW.setLayout(new BoxLayout(pnlVerifyPW, BoxLayout.X_AXIS));
pnlVerifyPW.setBorder(BorderFactory.createEmptyBorder(0,63,0,30));
pnlVerifyPW.add(new JLabel("Verify Password:"));
pnlVerifyPW.add(Box.createRigidArea(new Dimension(5,0)));
pnlVerifyPW.add(txtVerifyPW);
JPanel pnlTop= new JPanel();
pnlTop.add(pnlPW);
pnlTop.add(Box.createRigidArea(new Dimension(0,10)));
pnlTop.add(pnlVerifyPW);
pnlMain.add(pnlTop);
btnSubmit = new JButton("Submit");
btnSubmit.setActionCommand("SUBMIT");
btnSubmit.addActionListener(this);
btnCancel = new JButton("Cancel");
btnCancel.setActionCommand("CANCEL");
btnCancel.addActionListener(this);
JPanel pnlBottom = new JPanel();
pnlBottom.setLayout(new BoxLayout(pnlBottom, BoxLayout.X_AXIS));
pnlBottom.setBorder(BorderFactory.createEmptyBorder(25,55,20,30));
pnlBottom.add(btnSubmit);
pnlBottom.add(Box.createRigidArea(new Dimension(25,0)));
pnlBottom.add(btnCancel);
pnlMain.add(pnlBottom);
this.setContentPane( pnlMain);
setSize(350,230);
setVisible(true);
public void actionPerformed(ActionEvent e)
if(e.getActionCommand().equals("CANCEL")) this.setVisible(false);
if(e.getActionCommand().equals("SUBMIT")) submitPW();
* This method is called when the submit button is clicked. It allows user to change
* their password.
public void submitPW(){
myABC= ABC.getABC();//Is this correct?
char[] pw =txtPasswd.getPassword();
String strPasswd="";
for(int i=0;i<pw.length;i++){
strPasswd=strPasswd+pw;
char[] vpw =txtVerifyPW.getPassword();
String strVerifyPW="";
for(int i=0;i<vpw.length;i++){
strVerifyPW=strVerifyPW+pw;
if((strPasswd==null)||(strPasswd.length()==0)) {
JOptionPane.showMessageDialog(new JDialog(),"You have not enter a password. Please try again.",
"Invalid Password",JOptionPane.ERROR_MESSAGE);
if((!strPasswd.equals(strVerifyPW)))
//password and verify password do not match.
JOptionPane.showMessageDialog(new JDialog(),"Your passwords do not match. Reenter and try again.",
"Invalid Password",JOptionPane.ERROR_MESSAGE);
try
myABC.setUserPassword(strPasswd);//try to use a method in Singleton class
txtPasswd.setText("");
txtVerifyPW.setText("");
this.setVisible(false);
} catch(DelegateException e) {
JOptionPane.showMessageDialog(new Frame(),
"Error.",
"Unable to change password information.",JOptionPane.WARNING_MESSAGE);
} catch(UserNotFoundException e) {
JOptionPane.showMessageDialog(new Frame(),
"Error.",
"Unable to change password information.",JOptionPane.WARNING_MESSAGE);
And ofcourse I have other EJB classes to work with these classes.
***It compiles okey but when I ran, it say "NullPointerException"
I think I call my Singleton wrong.
Please help me.thanks

1. When replying, use <reply>, don't post a new topic.
2. Implementing a singleton is a frequently asked question. Search before you post.
3. This is not a question about Swing. A more appropriate forum would be "New To Java Technology" or perhaps "Java Programming", but see point 1.
4. When posting code, keep it short. It increases the chance of readers looking at it. And in composing your shorter version for the forum, you just may solve your problem.

Confused about standby redo log groups

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