Binding Factory Class

Question

Dear people,
I am relatively new in Oracle JDeveloper ( using it last 3 months ) and during my last task I am facing a problem to which i can not find the solution...
I am trying to set up a factory class from which i will get a Dynamic Table Binding depending on the given data. The problem I am facing has to do with getting a NullPointerException whenever I am trying to use my given panelBinding. Although i search numerous questions and answers in the forum and read a number of different examples given by the Aces I cant find a solution to this. Here is my code...
*public class BindingFactory  {*
*public BindingFactory() {*
public   JUPanelBinding panelBinding = new JUPanelBinding("BindingFactoryPageDef");
public  JUTableBinding create  (String objName,
String attributes,
String[] attributesNeeded
*) throws Exception {*
JTable myTable = new JTable();
*/*Locating and Loading AppModule*/*
ApplicationModule am = Configuration.createRootApplicationModule("model.EmpRegistryAppModule","EmpRegistryAppModuleLocal");++
panelBinding.setApplicationModule(am);
*/* Creating VO from Data given in method call */*
ViewObject myVO  = am.createViewObjectFromQueryStmt(objName, "SELECT " + attributes + " FROM " + objName );
*/*Executing the VO Query to produce the Rowset*/*
myVO.executeQuery();
*/*Creating the rowSet iterator */*
RowSetIterator rsi = myVO.createRowSetIterator("DynamicIterator");
JUMetaObjectManager.setErrorHandler(new JUErrorHandlerDlg());
JUMetaObjectManager mgr = JUMetaObjectManager.getJUMom();
mgr.setJClientDefFactory(null);
BindingContext binding = new BindingContext();
binding.put(DataControlFactory.APP_PARAM_ENV_INFO, new JUEnvInfoProvider());
binding.setLocaleContext(new DefLocaleContext(null));
HashMap map = new HashMap(4);
map.put(DataControlFactory.APP_PARAMS_BINDING_CONTEXT, binding);
mgr.loadCpx("view.DataBindings2.cpx" , map);
*/* This is where Null Pointer is coming from...*/*
---->     DCDataControl app = panelBinding.getBindingContext().findDataControl("EmpRegistryAppModuleDataControl");
app.setClientApp(DCDataControl.JCLIENT);
JUIteratorBinding itBinding = new JUIteratorBinding(app, rsi);
myTable.setModel((TableModel)panelBinding.bindUIControl(objName+"ViewObject2",myTable));
JUTableBinding tb = new JUTableBinding(myTable, itBinding ,attributesNeeded);
return tb;
Any Ideas?
Thanks in advance for your time and help.
Regards,
Pelopidas
Edited by: Zouridakis Pelopidas on Dec 23, 2010 6:22 AM
Edited by: Zouridakis Pelopidas on Dec 28, 2010 3:11 AM
Edited by: Zouridakis Pelopidas on Dec 28, 2010 3:26 AM
Edited by: Zouridakis Pelopidas on Dec 29, 2010 1:41 AM

Answer 1

Hi all,
Since I finally managed to set this up properly, i am posting my code here in order to share with everyone, since i couldnt find many similar examples!
It works fine in Oracle JDev 10.1.3.5.
To sum up, this is a factory class which receive the name of your entity object and dynamically creates a binded table ready for use.
import java.util.HashMap;
import javax.swing.JTable;
import javax.swing.table.TableModel;
import model.Employees1DefImpl;
import oracle.adf.model.BindingContext;
import oracle.adf.model.DataControlFactory;
import oracle.adf.model.binding.DCDataControl;
import oracle.jbo.ApplicationModule;
import oracle.jbo.ViewObject;
import oracle.jbo.common.DefLocaleContext;
import oracle.jbo.server.EntityDefImpl;
import oracle.jbo.uicli.binding.JUUtil;
import oracle.jbo.uicli.controls.JUErrorHandlerDlg;
import oracle.jbo.uicli.jui.JUEnvInfoProvider;
import oracle.jbo.uicli.jui.JUPanelBinding;
import oracle.jbo.uicli.jui.JUTableBinding;
import oracle.jbo.uicli.mom.JUMetaObjectManager;
*public class BindingFactory  {*
*public BindingFactory() {*
public JUPanelBinding panelBinding = new JUPanelBinding("BindingFactoryPageDef");
public  JTable createDynamicBindedTable   (String objName,
String[] attributesNeeded
*) throws Exception {*
JTable myTable = new JTable();
JUMetaObjectManager.setErrorHandler(new JUErrorHandlerDlg());
JUMetaObjectManager mgr = JUMetaObjectManager.getJUMom();
mgr.setJClientDefFactory(null);
BindingContext binding = new BindingContext();
binding.put(DataControlFactory.APP_PARAM_ENV_INFO, new JUEnvInfoProvider());
binding.setLocaleContext(new DefLocaleContext(null));
HashMap map = new HashMap(4);
map.put(DataControlFactory.APP_PARAMS_BINDING_CONTEXT, binding);
mgr.loadCpx("view.DataBindings2.cpx" , map);
DCDataControl app = binding.findDataControl("EmpRegistryAppModuleDataControl");
*/*Locating and Loading AppModule*/*
ApplicationModule am = (ApplicationModule)app.getDataProvider();
panelBinding.setApplicationModule(am);
*/* Creating VO from Data given in method call */*
ViewObject myVO  = am.createViewObjectOnEntity(objName+"Success", "model."+objName );
*/*Executing the VO Query to produce the Rowset*/*
myVO.executeQuery();
app.setClientApp(DCDataControl.JCLIENT);
TableModel tableModel = JUTableBinding.createAttributeListBinding( panelBinding, myTable,
objName+"Success", null, objName + "Iter", attributesNeeded );
myTable.setModel(tableModel);
return myTable;
*public JUPanelBinding getPanelBinding() {*
return panelBinding;
*public void setBindingContext(BindingContext bindCtx) {*
*if (panelBinding.getPanel() == null) {*
panelBinding = panelBinding.setup(bindCtx, this);
panelBinding.refreshControl();
*try {*                  
registerProjectGlobalVariables(bindCtx);
panelBinding.refreshControl();
*} catch (Exception ex) {*
panelBinding.reportException(ex);
*private void registerProjectGlobalVariables(BindingContext bindCtx) {*
JUUtil.registerNavigationBarInterface(panelBinding, bindCtx);
*private void unRegisterProjectGlobalVariables(BindingContext bindCtx) {*
JUUtil.unRegisterNavigationBarInterface(panelBinding, bindCtx);
*public void bindNestedContainer(JUPanelBinding ctr) {*
*if (panelBinding.getPanel() == null) {*
ctr.setPanel(this);
panelBinding.release(DCDataControl.REL_VIEW_REFS);
panelBinding = ctr;
registerProjectGlobalVariables(panelBinding.getBindingContext());
*try {*
*} catch (Exception ex) {*
ex.printStackTrace();
ctr.reportException(ex);
Thanks for your time and help,
Pelopidas