Painting Custom Component

I am writing a custom Component inheriting from JComponent class. I am doing custom painting of this component as the component I want has to have a gradient background. I am able to draw the graphics properly. But I am having a problem with the positioning of the control. I read in the tutorial for the custom painting of JComponent that we should paint the component taking the base as 0. If I place my component any where on the panel other than (0,0) the component either gets displayed at 0,0 or is not getting displayed properly.Kindly provide me with a solution.

Painting of the component and positioning of the component are two different things.
Yes painting is done relative to the top left of the component which is (0, 0);
Positioning of the component in a container is done by the Layout Manager. So you need to provide a getPreferredSize(...) implementation so the LayoutManager knows how much space to reserve for the component.
Maybe the Swing tutorial on [url http://java.sun.com/docs/books/tutorial/uiswing/14painting/index.html]Custom Painting will help you out. There is also a section on "Using Layout Manager".
If you need further help then you need to create a [url http://homepage1.nifty.com/algafield/sscce.html]Short, Self Contained, Compilable and Executable, Example Program that demonstrates the incorrect behaviour, because I can't guess exactly what you are doing based on the information provided.
And don't forget to use the [url http://forum.java.sun.com/help.jspa?sec=formatting]Code Formatting Tags so the code retains its original formatting.

Similar Messages

Scrolling a custom Component (e.g. JPanel) with overridden paint(Graphic g)

Hi.
I’m creating an application for modelling advanced electrical systems in a house. Until now I have focused on the custom canvas using Java2D to draw my model. I can move the model components around, draw lines between them, and so on.
But now I want to implement a JScrollPane to be able to scroll a large model. I’m currently using a custom JPanel with a complete override of the paint(Graphic g) method.
Screen-shot of what I want to scroll:
http://pchome.grm.hia.no/~aalbre99/ScreenShot.png
Just adding my custom JPanel to a JScrollPane will obviously not work, since the paint(Graphic g) method for the JPanel would not be used any more, since the JScrollPane now has to analyze which components inside the container (JPanel) to paint.
So my question is therefore: How do you scroll a custom Component (e.g. JPanel) where the paint(Graphic g) method is totally overridden.
I believe the I have to paint on a JViewport instructing the JScrollPane my self, but how? Or is there another solution to the problem?
Thanks in advance for any suggestions.
Aleksander.

I�m currently using a custom JPanel with a complete override of the paint(Graphic g) method. Althought this isn't your problem, you should be overriding the paintComponent(..) method, not the paint(..) method.
But now I want to implement a JScrollPane to be able to scroll a large model.When you create a custom component to do custom painting then you are responsible for determining the preferredSize of the component. So, you need to override the getPreferredSize(...) method to return the preferredSize of your component. Then scrolling will happen automatically when the component is added to a scrollPane.

JPanel won't display my custome component

Hi,
I made a custome component class that in its paint method at this stage is suppose to paint a white rectangle on screen. However the when I add this custome component to my JPanel it doesn't show up. Does anybody have a solution for this?
My code for the custome component is,
public spaceMediaDisplayObject(mediaObject mo){
     x = mo.getSpaceX();
     y = mo.getSpaceY();
     height = mo.getHeight();
     width = mo.getWidth();
     name = mo.getName();
     System.out.println("Constructor");
     this.repaint();
public void paint(Graphics g){
     System.out.println("Draw");
     g.setColor(Color.white);
     g.drawRect(x, y, height, width);
And the fragment of code I am using to try and display in on the panel is as follows,
spaceMediaDisplayObject smdo = new spaceMediaDisplayObject(toDisplay);
     spaceBodyPanel.add(smdo);
Please help if able.

If it's null then you need to set the size of each component explicitly:
JPanel panel = new JPanel(null);
Component customComponent = new CustomComponent();
panel.add(customComponent);
customComponent.setBounds(0, 0, 100, 100); // For exampleA simple layout manager could be used to make the component fill the panel, for example:
JPanel panel = new JPanel(new GridLayout(1, 1));
panel.add(new CustomComponent());Hope this helps.

Custom component not working properly

Hi all - I am trying to create a custom component. I have followed the suggested MVC architecture, and created the following classes:
1. SuperLineModel (the MODEL)
2. SuperLine (the actual component,e.g. the CONTROLLER)
3. BasicSuperLineUI (the UI Delegate class, e.g. the VIEW)
4. SuperLineUI (an abstract type class for my UI Delegate)
I also have a fifth class that draws a frame and panel, and then adds the custom component to the panel. In the main method of this class, I
register the UI delegate like this:
UIManager.put(BasicSuperLineUI.UI_CLASS_ID, "com.volant.mapit.view.BasicSuperLineUI");Everything compiles without any problems, but the custom component is never painted for some reason. In fact, I added a print line to the UI delegates paint method just to see if it was ever called, and it wasn't. I know I'm missing something here, and it's probably something small. I'm hoping some of you Swing gurus can take a look at my code below and point out the problem for me.
I really appreciate any help you can give me. Thanks.
The classes are listed below:
// SuperLineModel
import javax.swing.*;
import javax.swing.event.*;
public class SuperLineModel
private double sourceXCoord = 0;
private double sourceYCoord = 0;
private double targetXCoord = 0;
private double targetYCoord = 0;
private EventListenerList listenerList = new EventListenerList();
public SuperLineModel()
public SuperLineModel(double sourceXCoord, double sourceYCoord,
                       double targetXCoord, double targetYCoord)
    this.sourceXCoord = sourceXCoord;
    this.sourceYCoord = sourceYCoord;
    this.targetXCoord = targetXCoord;
    this.targetYCoord = targetYCoord;
public void setSourceXCoord(double x)
    this.sourceXCoord = x;
    return;
public void setSourceYCoord(double y)
    this.sourceYCoord = y;
    return;
public void setTargetXCoord(double x)
    this.targetXCoord = x;
    return;
public void setTargetYCoord(double y)
    this.targetYCoord = y;
    return;
public double getSourceXCoord()
    return this.sourceXCoord;
public double getSourceYCoord()
    return this.sourceYCoord;
public double getTargetXCoord()
    return this.targetXCoord;
public double getTargetYCoord()
    return this.targetYCoord;
public void addChangeListener(ChangeListener cl)
    listenerList.add(ChangeListener.class, cl);
public void removeChangeListener(ChangeListener cl)
    listenerList.remove(ChangeListener.class, cl);
// SuperLine
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import com.volant.mapit.view.*;
import com.volant.mapit.model.*;
public class SuperLine extends JComponent implements ChangeListener
private SuperLineModel model;
public SuperLine()
    init(new SuperLineModel());
public SuperLine(SuperLineModel model)
    init(model);
public void init(SuperLineModel model)
    setModel(model);
    setMinimumSize(new Dimension(50, 50));
    setPreferredSize(new Dimension(50,50));
    updateUI();
public void setUI(BasicSuperLineUI ui)
    super.setUI(ui);
public BasicSuperLineUI getUI()
    return (BasicSuperLineUI)ui;
public void updateUI()
    setUI((BasicSuperLineUI)UIManager.getUI(this));
    invalidate();
public String getUIClassID()
    return SuperLineUI.UI_CLASS_ID;
public SuperLineModel getModel()
    return model;
public void setModel(SuperLineModel model)
    SuperLineModel oldModel = model;
    if(oldModel != null)
      oldModel.removeChangeListener(this);
    if(model == null)
      model = new SuperLineModel();
    else
      model.addChangeListener(this);
    firePropertyChange("model", oldModel, model);
public void stateChanged(ChangeEvent evt)
    repaint();
// BasicSuperLineUI
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.plaf.*;
import com.volant.mapit.control.*;
public class BasicSuperLineUI extends SuperLineUI
public static ComponentUI createUI(JComponent c)
    return new BasicSuperLineUI();
public void installUI(JComponent c)
    SuperLine sl = (SuperLine)c;
public void uninstallUI(JComponent c)
    SuperLine sl = (SuperLine)c;
// This method is never called and I don't know why!!!
public void paint(Graphics g, JComponent c)
    super.paint(g, c);
    System.out.println("test2");
    g.fillRect(0, 0, 200, 400);
// SuperLineUI
import javax.swing.plaf.*;
import com.volant.mapit.control.*;
public abstract class SuperLineUI extends ComponentUI
public static final String UI_CLASS_ID = "SuperLineUI";

A quick glance at the code and it looks ok with the exception of the following which I don't understand what you're trying to do:
public void installUI(JComponent c) {
    SuperLine sl = (SuperLine)c;
public void uninstallUI(JComponent c) {
    SuperLine sl = (SuperLine)c;
}Here are my comments:
1) I expect Superline sl to be a global variable for use elsewhere in your program.
2) I have no idea what your uninstallUI does.
This is what I would do:
SuperLine sl;
public void installUI(JComponent c) {
    sl = (SuperLine)c;
public void uninstallUI(JComponent c) {
}Finally, I am assuming that the changelistener will trigger a repaint which in turn will call your paint method, right?
;o)
V.V.

UI delegate for a custom component

Hello folks,
I am trying to write (as said in the subject) a UI delegate for a custom component. I found the following in a Java FAQ (http://www.mindspring.com/~scdrye/java/faq.html#plaf_delegate):
8.3. How do I create a UI delegate for my custom component?
Have your component extend from JComponent (or a descendant of JComponent). Create a subclass of ComponentUI for your custom component, overriding at least the createUI() and paint() methods. To enable the new UI, override four methods of your JComponent subclass:
public class MyComponent extends JComponent {
public void updateUI() {
setUI((MyComponentUI)UIManager.getUI(this));
public void setUI(MyComponent newUI) {
super.setUI(newUI);
public MyComponentUI getUI() {
return (MyComponentUI)ui;
public String getUIClassID() {
return "MyComponentUI";
Well, it turns out that this is not enough. I also had to add during application start (just before initComponents()) the following:
UIManager.put(uiClassID, uiClassName);
to avoid exceptions during start of the program.
Well, now my component is painted (paintComponent()) is called, but the paint() method in my new UI delegate class is not called when the application starts.
It just gets called when I explicitily (in this case, using a menu item) change the L&F of the application.
If this informatio is not enough, I can add some excerpts of my code for the ease of understanding!!
Thanks a lot!

If I code a new custom component (extending JComponent, or extending the UI delegate of a standard component) and pretend it to be laf aware then I must create the corresponding UI delegate for each laf, like it happens to be with standard swing components. But I'm not sure it is feasible to create the UI delegates for all unknown existing custom lafs.You are right, this is never going to work. I suggest if you want to make your custom component look & feel aware, you design the way it displays around the l & f of other components that are part of j2se and have l&f implementations.
http://download.oracle.com/javase/7/docs/api/javax/swing/plaf/ComponentUI.html
There are instructions here:
http://download.oracle.com/javase/7/docs/api/javax/swing/LookAndFeel.html
>
On the other side, if I create a custom laf then I will also create a custom UI delegate for each standard component, but I can not create UI delegate for all unknown existing custom components.
The point here is that standard components and standard lafs are universally known, while custom components (or custom ui delegates) and custom lafs are not.
So the question is: How does a swing developer deal with the case of a new custom component that will be used in an unknown custom laf?
For instance:
1. Custom text UI delegate for dealing with styled documents in JTextField. See {thread:id=2284487}.
2. JTabbedPane with custom UI delegate that paints no tab if the component only contains one tab.
In both cases I need a UI delegate for each known laf, but what happens if the application is using a laf that certainly will not be aware of this custom functionally?
Thank you!

Custom component doesnt draw itself

Hey
Im relatively new to java, and especially to swing, heres the problem.
Im trying to make a custom component (extends JComponent).Ive overwridden the paintComponent() method. But when i make a new component and add it to JPanel, it isnt drawn, although i can see that the paintComponent() method of the component is indeed invoked: heres the short code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.MouseInputAdapter;
import javax.swing.*;
public class Test extends JFrame {
     static Test window;
     MouseOps mListener;
     JPanel drawingArea;
    public Test() {
          addWindowListener(new WindowAdapter() {
              public void windowClosing(WindowEvent e) {
               System.exit(0);
          drawingArea = new JPanel();
          drawingArea.setBackground(Color.white);
          getContentPane().add(drawingArea, BorderLayout.CENTER);
          mListener = new MouseOps();
          drawingArea.addMouseListener(mListener);
          drawingArea.addMouseMotionListener(mListener);
     class MouseOps extends MouseInputAdapter{
          public void mouseClicked(MouseEvent e) {
               int x = e.getX();
               int y = e.getY();
               TestComp comp = new TestComp(x, y);
               drawingArea.add(comp);
               drawingArea.validate();
               repaint();
     public static void main(String[] args) {
          window = new Test();
          window.setTitle("Test");
          window.setSize(450, 260);
          window.setVisible(true);
class TestComp extends JComponent {
     int x, y;
     TestComp(int x, int y){
          this.x = x;
          this.y = y;
     public void paintComponent (Graphics g) {
          super.paintComponent(g);
          g.setColor(Color.blue);
          g.drawRect(x, y, 30, 30);
          System.out.println("Should be drawn at: " + x + " " + y);
}

Your component has zero size. The passed in graphics instance has its clip set
to the components size, so you will never be able to draw anything.
So you have two choices:
* set the bounds of your component manually. To do this you will have to use
a null LayoutManager: http://java.sun.com/docs/books/tutorial/uiswing/layout/index.html
* or else do not use a separate component for each graphics object at all.
Use a single container that overrides paintComponent() and iterates itself
over the graphics objects and calls paint on them. Because the graphics
objects are much more lightweight this approach scales better and is usually
taken in graphics frameworks.
Stephen

How to get an event both in custom component and into its instance

I have a custom component that extends a Jtree
I want to know when a node is clicked both , into my component and after into the component sited into Jpanel
now, I can only detect it into the component, but I dont know how to detect it at the component I have in my Jpanel
I have 'addTreeSelectionListener' in both places ...
xxxxx.addTreeSelectionListener(new javax.swing.event.TreeSelectionListener() {
public void valueChanged(javax.swing.event.TreeSelectionEvent e) { .....
Any help ?
Thanks

tonnot wrote:
Thank you.
I think that a good answer can be ' Revise your code, because there must be a problem' Well, that's the life of a programmer. If you want to post an SSCCE, I'm sure somebody can help if you get stuck.
And ...
Why are you extending JTree? I'd bet you shouldn't be.Why not ? ....
Why SUN develop the 'extends' functionality ? You should use extends if you're changing the behavior of an existing class. An example of this is extending JPanel and overriding the paintComponent() method to do some custom painting.
You should not use extends if you just need an instance of an existing class. An example of this is extending JFrame instead of simply creating a JFrame instance.
Without seeing your code, I can't be sure you're misusing extends. But many people do.
Here's an example.
Bad:
public class MyProgram extends JFrame{
   public MyProgram(){
      setSize(200, 200);
      setVisible(true);
   public static void main(String [] args){
      new MyProgram();
}Better:
public class MyProgram{
   public MyProgram(){
      JFrame frame = new JFrame();
      frame.setSize(200, 200);
      frame.setVisible(true);
   public static void main(String [] args){
      new MyProgram();
}

Problem with inputText in my custom component

Hi, I have a custom dataTable component that I'm trying to get to work. It has to be a custom component because dataTable doesn't support rowspan, colspan, multi line headers, and a rendered attribute for rows. The problem is, that when I wrap the column tag inside my row tag then the method for the inputText tag never gets called in the UPDATE_MODEL_VALUES phase.
I'm starting to think that JSF doesn't support 2 levels of tags between the inputText and dataTable. I'm hoping that someone can tell me what I have wrong with my components.
Here is the JSP snippet.
<cjsf:rptTable>
     <cjsf:data id="dataTable1" value="#{allAuthUser.tableRows}" var="myTableRow1">
          <cjsf:row>
               <cjsf:col>
                    <h:inputText id="tableTestFld" value="#{myTableRow1.testFld}" size="5" maxlength="5"/>
               </cjsf:col>
          </cjsf:row>
     </cjsf:data>
</cjsf:rptTable>Here is what it renders. It looks to me like everything renders fine. So I'm guessing that there is something in a component that is causing JSF during the life cycle to not be able to process correctly.
<table>
     <tbody>
          <tr>
               <td><input id="tblmaintForm:body:dataTable1_0:tableTestFld" name="tblmaintForm:body:dataTable1_0:tableTestFld" type="text" value="" maxlength="5" size="5"/></td>
          </tr>
          <tr>
               <td><input id="tblmaintForm:body:dataTable1_1:tableTestFld" name="tblmaintForm:body:dataTable1_1:tableTestFld" type="text" value="" maxlength="5" size="5"/></td>
          </tr>
          <tr>
               <td><input id="tblmaintForm:body:dataTable1_2:tableTestFld" name="tblmaintForm:body:dataTable1_2:tableTestFld" type="text" value="" maxlength="5" size="5"/></td>
          </tr>
     </tbody>
</table>Note: If I leave off the row tag it renders the same way except of course the <tr> and </tr> tags are missing. If I do this, then the backing method for the inputText tag is called and everything works fine. Why doesn't it work with the row tag in place?
Here are the components:
public class UIRptTable extends UIComponentBase {
     public UIRptTable() {
          setRendererType("tblmaint.rptTableRenderer");
     public String getFamily() {
          return "javax.faces.Output";
public class UIRptTableData extends HtmlDataTable {
     public UIRptTableData() {
          setRendererType("tblmaint.rptTableDataRenderer");
     public String getFamily() {
          return "javax.faces.Data";
public class UIRptTableRow extends UIOutput {
     public UIRptTableRow() {
          setRendererType("tblmaint.rptTableRowRenderer");
     public String getFamily() {
          return "javax.faces.Output";
public class UIRptTableCol extends UIColumn {
     public UIRptTableCol() {
          setRendererType("tblmaint.rptTableColRenderer");
     public String getFamily() {
          return "javax.faces.Column";
}Here is part of the faces-config file in case you need it.

<component>
     <component-type>tblmaint.rptTable</component-type>
     <component-class>com.monsanto.ag_it.fieldops.aim.tblmaint.component.UIRptTable</component-class>
</component>
<component>
     <component-type>tblmaint.rptTableData</component-type>
     <component-class>com.monsanto.ag_it.fieldops.aim.tblmaint.component.UIRptTableData</component-class>
</component>
<component>
     <component-type>tblmaint.rptTableRow</component-type>
     <component-class>com.monsanto.ag_it.fieldops.aim.tblmaint.component.UIRptTableRow</component-class>
</component>
<component>
     <component-type>tblmaint.rptTableCol</component-type>
     <component-class>com.monsanto.ag_it.fieldops.aim.tblmaint.component.UIRptTableCol</component-class>
</component>

<render-kit>
     <renderer>
          <component-family>javax.faces.Output</component-family>
          <renderer-type>tblmaint.rptTableRenderer</renderer-type>
          <renderer-class>com.monsanto.ag_it.fieldops.aim.tblmaint.renderer.RptTableRenderer</renderer-class>
     </renderer>
</render-kit>
<render-kit>
     <renderer>
          <component-family>javax.faces.Data</component-family>
          <renderer-type>tblmaint.rptTableDataRenderer</renderer-type>
          <renderer-class>com.monsanto.ag_it.fieldops.aim.tblmaint.renderer.RptTableDataRenderer</renderer-class>
     </renderer>
</render-kit>
<render-kit>
     <renderer>
          <component-family>javax.faces.Output</component-family>
          <renderer-type>tblmaint.rptTableRowRenderer</renderer-type>
          <renderer-class>com.monsanto.ag_it.fieldops.aim.tblmaint.renderer.RptTableRowRenderer</renderer-class>
     </renderer>
</render-kit>
<render-kit>
     <renderer>
          <component-family>javax.faces.Column</component-family>
          <renderer-type>tblmaint.rptTableColRenderer</renderer-type>
          <renderer-class>com.monsanto.ag_it.fieldops.aim.tblmaint.renderer.RptTableColRenderer</renderer-class>
     </renderer>
</render-kit>I sure hope that someone can help me out. Please let me know if you need any additional information.
Thanks,
Ray

Hi, Ray!
1) I was trying to put a button in the column header (for sorting) and I couldn't get that to work. That involved the >colhdr tag. I got that to work but I don't remember the fix. I'll look it up and reply back with that when I can.Dealing the first part of your trouble, you need NOT a custom component.
I have looked through the implementation of RepeaterRenderer, as you advised me, and found that the multi-header possibility is included in the implementation of dataTable control.
The code below is the part of source of repeater.jsp with only change:
<d:data_repeater>  <h:dataTable>
And it works fine.
<h:dataTable id="table"
binding="#{RepeaterBean.data}"
     rows="5"
value="#{RepeaterBean.customers}"
var="customer">
<f:facet name="header">
<h:outputText value="Customer List"/>               <!� First Header row -- >
</f:facet>
<h:column>
<%-- Visible checkbox for selection --%>
<h:selectBooleanCheckbox
id="checked"
binding="#{RepeaterBean.checked}"/>
<%-- Invisible checkbox for "created" flag --%>
<h:selectBooleanCheckbox
id="created"
binding="#{RepeaterBean.created}"
rendered="false"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Account Id"/>               <!�Second Header row -- >
</f:facet>
<h:inputText id="accountId"
binding="#{RepeaterBean.accountId}"
required="true"
size="6"
value="#{customer.accountId}">
</h:inputText>
<h:message for="accountId"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Customer Name"/>               <!�Second Header row -- >
</f:facet>
<h:inputText id="name"
required="true"
size="50"
value="#{customer.name}">
</h:inputText>
<h:message for="name"/>
</h:column>
<h:column>
<f:facet name="header">                    <!�Second Header row -- >
<h:outputText value="Symbol"/>
</f:facet>
<h:inputText id="symbol"
required="true"
size="6"
value="#{customer.symbol}">
<f:validateLength
maximum="6"
minimum="2"/>
</h:inputText>
<h:message for="symbol"/>
</h:column>
<h:column>
<f:facet name="header">                    <!�Second Header row -- >
<h:outputText value="Total Sales"/>
</f:facet>
<h:outputText id="totalSales"
value="#{customer.totalSales}">
<f:convertNumber
type="currency"/>
</h:outputText>
</h:column>
<h:column>
<f:facet name="header">                    <!�Second Header row -- >
<h:outputText value="Commands"/>
</f:facet>
<h:commandButton id="press"
action="#{RepeaterBean.press}"
immediate="true"
value="#{RepeaterBean.pressLabel}"
type="SUBMIT"/>
<h:commandLink id="click"
action="#{RepeaterBean.click}"
immediate="true">
<h:outputText
value="Click"/>
</h:commandLink>
</h:column>
</h:dataTable>
You may have a look at HTML source to prove that dataTable is already what you need:
<table id="myform:table">
<thead>
<tr><th colspan="6" scope="colgroup">Customer List</th></tr>
<tr>
<th scope="col"></th>
<th scope="col">Account Id</th>
<th scope="col">Customer Name</th>
<th scope="col">Symbol</th>
<th scope="col">Total Sales</th>
<th scope="col">Commands</th>
</tr>
</thead>
<tbody>
2.) The second trouble is still unsettled as previously. Right now I have different task at my job, and I can�t continue investigation of this problem.
But when you find smth., please let me know. I�ll be very grateful.
Regards,
Oleksa Stelmakh

Unable to Edit the View in Custom Component

Hi Experts,
Please help me to resolve this issue !
I am unable to lock the BOL Entity in my custom component using BTAdminH. I have written the below code in the Edit event Handler for Edit Button. The lr_entity->lock( ) condition statement is getting false and it is skipping the "set_view_editable( me )." code statement. Why??
This is code excerpt that I have taken from edit button of the BP_HEAD/AccountViewSet and altered to my component/View
DATA: lr_entity     TYPE REF TO cl_crm_bol_entity,
        lr_controller TYPE REF TO cl_ZVKH8_bspwdcomponent_impl.
TRY.
      lr_controller ?= me->comp_controller.
      lr_entity ?= lr_controller->typed_context->btadminh->collection_wrapper->get_current( ).
IF lr_entity IS BOUND.
IF lr_entity->IS_LOCKED EQ abap_false.
    IF le_entity->IS_CHANGEABLE EQ abap_true.
       IF lr_entity->lock( ) EQ abap_true.
        me->view_group_context->set_view_editable( me ).
       ENDIF.
    ENDIF.
ENDIF.
ENDIF.
and when I directly executed the below code in the Edit event Handler for Edit Button I am receiving the dereferencing NULL value exception. Why in my custom component in many places this happening??
me->view_group_context->set_view_editable( me ).
Exception Details
CX_SY_REF_IS_INITIAL - Dereferencing of the NULL reference
Method: ZL_ZVKH8_DETAILSEF_IMPL=>EH_ONBACK
Thanks,
Bujji

Hi Summit & NishaNC,
Thanks for your responses !
As suggested, I have debugged the code for ->lock( ) method and there are exceptions raised from some methods.
Method GET_LOCK () -> Method GET_ROOT () ->Method GET_PARENT ()
At GET_ROOT( ) method i have received an exception
"Root entity BTAdminH could not be determined" and one more "Entity BTAdminH could not be locked"
Later when I have checked in MODEL Browser, I found that the BOL object "BTAdminH" for my view is an Access object and not the Root Object.
Hence, I have a question? Does the locking can be done only for ROOT Objects?
If this is TRUE then I think this is the major problem with my custom component where even the cross component navigation is also not happening and in many places I am receiving "Dereferencing NULL Value" information.
Also I have gone through some of the Threads and one information that I found from Sumit Mittal
1. An access object is an independent entity, has primary keys of its own.
2. A root object is a special access object that is at the top of the hierarchy based on business rules.
3. A dependent object's primary keys are supplied by access objects and it's lifetime is bound to them. If the parent object is destroyed, the dependent object is also destroyed.
4. Search objects are query objects useful for querying root objects
5. Search result objects - Search objects return the results in the form of a result object together with a relation pointing to the root object.
6. View objects - ?
7. Dynamic search objects - Used in advanced search, supports ranges and operators
Could you please specify in which scenarios we have to go for Access Objects and Root Objects
Thanks,
Bujji

How do you reference a valueObject located in main to a custom component created in Catalyst?

Hello,
I have been working with the Catalyst Beta 2 / Flash Builder beta trying to create a photogallery and have hit a little bit of a snag, try as I might I can't seem to find the answer anywhere. I am still new to Flex so please excuse me if this is a basic question, I have been trying to understand more about Flex to make my designs in Catalyst better.
I found this video on Adobe TV: http://tv.adobe.com/watch/rich-internet-applications-101/ria-stepbystep-16-binding-a-data- service-to-flash-builder-components/
It's wonderful and I have the datalist I created in Catalyst working with the XML file I generated but I designed my little photogallery a bit diffrent, I created a Custom Component in Catalyst so that when you click an item on the DataList it pop's up a little screen with a larger photo in on it, rather then having an image in the main application. Now my problem seems to be that I can't refrence the valueObject I created with the wizard as it's in my Main.mxml file, is there a way to refrence it from my Custom Component so the larger image will display? Is there a way to let the component know which item on the dataList in the main application is selected and display the correct image?
I should also say I really enjoy working with the Beta for both Flash Builder / Catalyst, thanks for the hard work!
Thanks for the help,
Chris

I am afraid you cannot bind to static properties in Windows Store Apps. It is simply not supported.
You could create a proxy class that exposes the static command property and bind to this property of an instance of the proxy object:
http://stackoverflow.com/questions/14186175/bind-to-a-static-field-in-windows-8-xaml
http://stackoverflow.com/questions/4708711/how-can-i-use-the-xstatic-extension-for-phone7-silverlight-apps
You will of course have to create an instance of the proxy object. There is no way around this.
Please remember to mark helpful posts as answer to close your threads and then start a new thread if you have a new question.

How to handle custom component data on overviewset save button CRM UI

Hi,
I have added a custom component to a standard view which is enchanted.
I can handle any data with my buttons on the component but after editing data
i need the save the data when the save button on the overview(top) is pressed.
I have redefined save button of overview but i cant get my data.
My node name is Root. I think i couldnt bind it to overview.
How can i do that?
Thank you

Probably it can be done by
http://wiki.sdn.sap.com/wiki/display/CRM/CRMWebUITechnical-CreatingTableViewInWebUI
i am trying
Thank you

Custom Component UI not displaying in 11G

Hi All,
   We have a custom component in 10G where we have added new link in the UCM Home Page, it will be displayed beside Administration tab with name Edit Tables, under this we have sub links Alldistr_RVS, Distprod, Distuser, Prdstate, Products_RVS, State_RVS, Stateusr. When we deployed this code in 11G it is not working. Could any one please provide me code to make it work in 11G instace. Appreciate your help on this.
Below is the code used in 10G in resource file
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>
ampfRVSEditTables htmlIncludeOrString
</title>
</head>
<body>
<@dynamichtml custom_finish_layout_init@>
<$include super.custom_finish_layout_init$>
<$include how_to_components_menu$>
<$include vbis_edit_tables_link$>
<@end@>
<@dynamichtml how_to_components_menu@>
<$if not how_to_components_menu_included$>
//add a drop-down menu, or a tray to the UI
navBuilder.addChildNodeTo('NAVTREE', 'collection', 'id==EDIT_Tables', 'label==Edit Tables');
if (navBuilder.menuB)
navBuilder.menuB.addTopLevelNode("EDIT_Tables");
else if (navBuilder.trayA)
navBuilder.trayA.addTopLevelNode("EDIT_Tables");
<$EDIT_Tables_menu_included=1$>
<$endif$>
<@end@>
<@dynamichtml vbis_edit_tables_link@>
navBuilder.addChildNodeTo('EDIT_Tables', 'item', 'id==ALLDISTR_RVS',
'label==Alldistr_RVS', 'url==<$HttpCgiPath$>?IdcService=GET_ALLDISTR_RVS_PAGE');
navBuilder.addChildNodeTo('EDIT_Tables', 'item', 'id==DISTPROD',
'label==Distprod', 'url==<$HttpCgiPath$>?IdcService=GET_DISTPROD_PAGE');
navBuilder.addChildNodeTo('EDIT_Tables', 'item', 'id==DISTUSER',
'label==Distuser', 'url==<$HttpCgiPath$>?IdcService=GET_DISTUSER_PAGE');
navBuilder.addChildNodeTo('EDIT_Tables', 'item', 'id==PRDSTATE',
'label==Prdstate', 'url==<$HttpCgiPath$>?IdcService=GET_PRDSTATE_PAGE');
navBuilder.addChildNodeTo('EDIT_Tables', 'item', 'id==PRODUCTS_RVS',
'label==Products_RVS', 'url==<$HttpCgiPath$>?IdcService=GET_PRODUCTS_RVS_PAGE');
navBuilder.addChildNodeTo('EDIT_Tables', 'item', 'id==STATE_RVS',
'label==State_RVS', 'url==<$HttpCgiPath$>?IdcService=GET_STATE_RVS_PAGE');
navBuilder.addChildNodeTo('EDIT_Tables', 'item', 'id==STATEUSR',
'label==Stateusr', 'url==<$HttpCgiPath$>?IdcService=GET_STATEUSR_PAGE');
<@end@>
</body>
</html>
Thanks.
Ashok

Hi Jiri,
   I from the sample example I tried to develop component to display HOW_TO_COMPONENTS as Menu item under which there is sub item Annuity_Dispname_Mapping, but it is not displaying. I am afraid where it went wrong. Below is the code i used, please help me to fix this. Thank you
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>
MenuExample htmlIncludeOrString
</title>
</head>
<body>
<@dynamicdata CoreMenuItems@>
id,           label,       linkType, linkData
HOW_TO_COMPONENTS, How To Components, YuiDev,
ANNUITY_DISPNAME_MAPPING, Annuity_Dispname_Mapping, YuiDev, <$HttpCgiPath$>?IdcService=GET_DATA_ACCESS_PAGE
<@end@>
<@dynamicdata CoreMenuItemRelationships@>
<?commatable mergeKey="primaryKey"?>
parentId,    id,           loadOrder
MENU_A,      HOW_TO_COMPONENTS, 1000
HOW_TO_COMPONENTS, ANNUITY_DISPNAME_MAPPING, 10
<@end@>
<@dynamicdata CoreMenuItemsFlags@>
id,           flags
HOW_TO_COMPONENTS, isLoggedIn
ANNUITY_DISPNAME_MAPPING, isLoggedIn
<@end@>
<@dynamicdata CoreMenuItemsImages@>
id,           image,                imageOpen
HOW_TO_COMPONENTS,     ScsPageItem.gif,
ANNUITY_DISPNAME_MAPPING,     ScsPageItem.gif,
<@end@>
<@dynamicdata ampcustom_menu_items_template_data@>
<?commatable indexedColumns="id"?>
id,                  parentId,    linkType,        flags
HOW_TO_COMPONENTS_LINK_TEMPLATE, HOW_TO_COMPONENTS, external,
<@end@>
<@dynamichtml custom_navigation_menu_items@>
<$include super.custom_navigation_menu_items$>
<$urlCount = 0$>
<$if utLoadResultSet("pne_portal", "PersonalURLS")$>
<$if rsFirst("PersonalURLS")$>
<$loop PersonalURLS$>
<$ddAppendIndexedColumnResultSet("ampcustom_menu_items_template_data", "NavigationMenuItems", "id", "HOW_TO_COMPONENTS_LINK_TEMPLATE")$>
<$rsLast("NavigationMenuItems")$>
<$NavigationMenuItems.id = "HOW_TO_COMPONENTS_" & urlCount$>
<$NavigationMenuItems.label = js(title)$>
<$NavigationMenuItems.linkData = js(website)$>
<$NavigationMenuItems.loadOrder = urlCount$>
<$urlCount = urlCount + 1$>
<$endloop$>
<$endif$>
<$endif$>
<@end@>
</body>
</html>
Thanks

Decode-method for custom component isn't called

Hi,
i have writen a custom component which gets some information by command-link. To make the data from the link accessible, i wrote a decode method in my renderer and in me component. But both method are not called from the faces framework.
Dows anybody knows what i made wrong???
Thanks, Sebastian

Hi,
thank you for your reply.
Unfortunately the processDecodes(...) of my component is also not called from the framework. Does anybody knows what i'm making wrong???
Thanks!

Problem with attributes in custom component

Hi All,
I am creating a simple jsf PanelGrid custom component....in that component I am adding two new attributes....
when I use that tag in my jsf application it is rendering fine in the client side....but the parent class that is PanelGrid component's attributes are not inheriting to my custom panelgrid....
can any one tell me how can I use the attributes of the super class PanelGrid??
Thanks...

Have you configured the attributes in the tag library descriptor?

How to construct the component tree in my custom component?Help!

Hi, i am writing a custom component like this:
public class HtmlCategory extends HtmlPanelGrid
     public void processRestoreState(javax.faces.context.FacesContext context,
            java.lang.Object state)
          setColumns(1);
          HtmlCommandLink link=new HtmlCommandLink();
          link.setValue("Let's Bingo");
          MyUtil.setActionListener(context,link,"#{temp.mytest}");
          UIParameter param=new UIParameter();
          param.setName("name");
          param.setValue("Robin!");
          link.getChildren().add(param);
          param.setParent(link);
          getChildren().add(link);
          link.setParent(this);
          super.processRestoreState(context,state);
}         you see, i want to construct the compont tree at Restore View phase this way,because the structure of the component tree will always be the same, so i don't the user to write extra code.
But the children of the component are not rendered,the renderer of the HtmlCategory component just extends the HtmlGridRenderer(myfaces) directly,and always calls the "super" methods in the encode methods of the renderer.
I got a message from the console:
Wrong columns attribute for PanelGrid id0:id4: -2147483648
but i have set the columns attribute in the code above, so what's happening? or please give some advice about how to render the component tree by myself in Restore View with the tree constructing code in the custom component class code,just lke the code above.
Best Regards:)
Robin

Well, i don't know if i have got my question clear.
usually, according to the tags you use in the jsf page, a component tree will be created at the Restore View phase,for example:
<f:form>
<h:panelGrid ...........>
          <h:dataTable ................>
          </h:dataTable>
   </h:panelGrid>
</f:form>but because i am writing a component for my web app, all the child components and their attributes are not likely to change. so i want to reduce the tags into one custom tag, and construct the component tree internally by myself.But it is not the case of backing bean.So i wrote the the code in the method:
public void processRestoreState(javax.faces.context.FacesContext context,java.lang.Object state)as it is shown in my orginal message.But it seems that it is not right way to construct my component tree.So where should i put the code that construct the component tree?Overriding the method :
public void processRestoreState(javax.faces.context.FacesContext context,java.lang.Object state)is not the right way?
Best Regards:)
Robin

Painting Custom Component

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