Bean reference technique to enable Oracle Application Development Framework regions to make callbacks to their parent pages. Part 2

Overriding the Departments Table Selection Listener

Now that the departments task flow is configured, the next step is to wire up the table with the managed bean in pageFlow scope. This step will enable selected row data to pass to the parent page whenever a user selects a table row in the user interface. To perform this task, you need to override the SelectionListener of the table, as shown below. 1. In the task flow diagram that shows the contents of the departments-task-flow.xml file, double-click the DepartmentsView activity to open the page. 2. In the page editor, click the af:table#t1 bread crumb at the bottom of the visual editor window to select the table. 3. In the Property Inspector, navigate to the SelectionListener property within the Behavior category. If the Behavior category is not yet expanded, expand it by clicking the + icon. 4. Click the down-arrow icon on the right-hand side of the SelectionListener property field, and choose Edit from the context menu to bring up the Edit Property: Selection Listener dialog box. 5. Select departmentsFlowBean from the Managed Bean list. 6. Click the New button next to the Method field to create a new managed bean method to handle the selection event. 7. In the Create Method dialog box, define the MethodName as onRowSelect and click OK twice. 8. Select the DepartmentsPageFlowBean .java tab, the first tab in the Oracle JDeveloper code editor area. (This is the first file you opened in this tutorial.) 9. Navigate to the onRowSelect( SelectionEvent selectionEvent) method, and place the cursor within the code braces. 10. Add the following code to invoke a precreated method on the bean’s superclass: 11. super.onRowSelect(selectionEvent, parentHandle); 12. Save your work, and close all opened tabs by clicking the x at the right side of each. In this section, you changed the default row selection behavior, and by doing so, you synchronized the table selection with the Oracle ADF binding layer to invoke a method on the managed bean superclass. The onRowSelect method of the superclass does two things: it synchronizes the user row selection with the binding layer, and it notifies the parent task flow bean about the selection change. To handle these tasks, it uses the parentHandle variable you passed in as an argument. Configuring the Parent Task Flow Bean In this sample application, the managed bean that dispatches the messages sent from the regions to the parent page is configured in the unbounded task flow definition (adfc-config.xml). To build and configure the managed bean, follow these steps: 1. In the ViewController project, expand the Application Sources folder and navigate to the beans package node within the oramag.mayjun.thirteen.view node. 2. Right-click the beans node, and choose New from the menu that appears. 3. In the New Gallery dialog box, select the General -> Java node. 4. From the right-hand list, select Class, and click OK. 5. In the Create Java Class dialog box, add the Name field value ParentPageBean. 6. In the Package field, append .parent to the current package name so it reads oramag.mayjun.thirteen.view .beans.parent. 7. In the Optional Attributes section, click the green plus (+) icon next to the Implements label to implement an interface class. 8. In the class and package browser, switch to the Hierarchy tab (if it’s not already selected) and navigate to the oramag -> mayjun -> thirteen -> view -> beans -> interfaces package node. 9. Expand the interfaces package node, and select ParentHandle. Click OK twice. 10. Save your work. In this section, you created the managed bean for the parent task flow and implemented the ParentHandle interface, which defines the communication contract between the region and the parent bean through the notifyParent method. If you use this technique in your custom Oracle ADF application projects, you can define additional methods. Next, add the implementation code to the managed bean so that the parent page updates whenever the regions pass data. 11. Expand the ViewController -> Resources node in the Application Navigator, and double-click ParentPageBean.txt. 12. Copy the contents of the ParentPageBean.txt file to the clipboard by pressing Ctrl + A followed by Ctrl + C. 13. Copy the contents of the clipboard to the ParentPageBean.java class by selecting the ParentPageBean.java tab, clicking in the class, and pressing Ctrl + A followed by Ctrl + V. 14. Save your work, and close all tabs. Next, configure ParentPageBean.java as a managed bean in the parent task flow (adfc-config.xml). 15. In the Oracle JDeveloper Application Navigator, expand the ViewController -> Web Content -> WEB-INF folder and double-click the adfc-config.xml file. 16. In the opened adfc-config.xml diagram, click the Overview tab at the bottom. 17. Select the Managed Beans menu entry, and click the green plus (+) icon next to the Managed Beans label. 18. Click in the Name field, and change the default name to ParentPageBean. 19. Click in the Class field. Click the down-arrow icon on the right, and select the Edit menu entry to open the class browser. 20. In the Edit Property dialog box, switch to the Hierarchy tab (if it’s not already selected). 21. Navigate to and expand the oramag -> mayjun -> thirteen -> view -> beans -> parent package node. 22. Select the ParentPageBean class, and click OK. 23. Finally, for the Scope field value, select view from the list. 24. Save your work. Adding the Regions to the Parent Page Next Steps DOWNLOAD Oracle JDeveloper 11g the sample application for this article LEARN more about contextual events “Implement Contextual Events” “Master and Commander” Almost there! The next step is to add the departments task flow (departments-task-flow.xml) and the employees task flow (employees-task-flow.xml) to the ParentPage.jsf file as a region. Note that the employees task flow has been fully precreated for this tutorial, so there is no need for you to build it first. To perform this task, you need to pass the ParentPageBean managed bean reference as an input argument to the region to set up the communication link. 1. In the Application Navigator, expand the ViewController -> Web Content -> pages double-click ParentPage.jsf. The file will open in the visual editor. 2. Expand the ViewController -> Web Content -> WEB-INF -> btf folder. 3. Drag and drop the departments-task-flow.xml file into the Departments Region area in the visual editor, as shown in Figure 3. Figure 3: Creating the departments region 4. In the opened Create dialog box, select the Region menu entry. 5. In the opened Edit Task Flow Binding dialog box, click in the Value field with the red border around it. (If you don’t see this dialog box, you most likely forgot to check the required checkbox for the task flow input parameter as explained in step 33.) 6. Click the down-arrow icon, and choose Expression Builder from the menu. 7. In the Expression Builder dialog box, expand the ADF Managed Beans -> viewScope node and select ParentPageBean. 8. Click OK twice to create the region. 9. Repeat steps 71 through 76 for the employees-task-flow.xml task flow definition, but drop it in the Employees Region page area. Save your work. Running the Sample The ParentPage.jsf page contains an output text box for displaying the region ID of an incoming message as well as an af:forEach Oracle ADF Faces tag to print the message sent from the bounded task flow. Both UI components of the Oracle ADF Faces feature of Oracle ADF reference the ParentPageBean managed bean, which is why it was important that you used the names suggested in this tutorial. Run the page by following the steps below: 1. In the Application Navigator, expand the ViewController -> Web Content -> pages node and right-click the ParentPage.jsf page. 2. Choose Run from the menu that appears. 3. Once the page is displayed in the browser, select a row in the departments table or the employees table that is not currently selected to see the region-to-parent-page communication shown in Figure 2. Conclusion This article explained a technique for establishing region-to-parent-page communication by using a managed bean reference. Although the article doesn’t cover it, you can also extend this technique by using the parent task flow as a dispatcher to implement bidirectional region-to-region interaction—a testament to the power of this approach. By using bounded task flow templates to define the bounded task flow input parameter and managed bean, you can make the bean reference technique a part of your overall task flow design strategy. This approach adds a powerful new tool to your Oracle ADF toolbox.

Bean reference technique to enable Oracle Application Development Framework regions to make callbacks to their parent pages.Part 1

One of the core architecture patterns in Oracle Application Development Framework (Oracle ADF) that promotes modular software design is the ability to expose bounded task flows in regions on a page. For a region to make callbacks to the owning page or view at runtime, developers typically use one of the following techniques: • Contextual events, the messaging channel of the Oracle ADF binding layer, which enables Oracle ADF regions to establish bidirectional communication with other regions as well as the owning page or view. • The task flow parent action activity, which can be used to invoke a navigation case on a parent page or view. It’s a declarative option, however, that allows only navigation. • Bean reference, a technique in which a managed bean of the parent page task flow is passed as reference to a bounded task flow exposed in a region. The bounded task flow uses this reference to invoke a method on the managed bean, thus calling back into the parent task flow. Using contextual events, covered in two previous Oracle Magazine articles (see “Implement Contextual Events” and “Master and Commander”), is the most powerful technique for page-to-region and region-to-region interaction, and it also enables communication with nested regions. However, setting up contextual events is complex, and many developers balk at the unnecessary overhead for simple region communication use cases. The bean reference technique explained in this article is easy to implement and well suited for many region communication use cases, making it an important part of the everyday toolbox of an Oracle ADF developer. This article explains how to configure and use a managed bean reference as a communication channel between a region and its parent page or view and includes a hands-on tutorial for you to walk through, using a provided sample application. Note that for the rest of this article, the parent page task flow is referred to as the parent task flow. The page or page fragment (view) containing the region is referred to as the parent page. Design-Time Architecture As shown in Figure 1, the bean reference technique involves two managed beans. The first managed bean is defined in view scope of the parent task flow, and the other bean is defined in pageFlowScope of the bounded task flow that is exposed in the region. Figure 1: Bean reference technique design-time architecture The managed bean of the parent task flow is passed as a reference to an input parameter that is defined on the bounded task flow exposed through the region. The bounded task flow saves the bean reference in a variable of its pageFlowScope bean. Using the reference to the managed bean in the parent task flow, the bounded task flow can then invoke methods on the bean or pass information to the parent task flow. To understand why this technique works, it is important to review bean scopes and lifecycles. A managed bean configured in view scope lives as long as the page from which it is referenced remains active. The lifecycle of a task flow exposed in a region starts during the rendering of the parent page (unless the activation property is set to deferred). The task flow is dismissed when the application navigates away from the parent page, at which time the bounded task flow managed bean also becomes available for garbage collection. As a result, both managed beans in our bean reference design—the managed bean in view scope of the parent task flow and the managed bean in page flow scope of the bounded task flow in the region—exist for as long as the parent view is shown. Because both beans live at the same time, it is safe to pass a bean reference from the parent task flow to the bounded task flow in the region without risking a null pointer exception or losing state. Sample Application Overview Figure 2 shows the runtime view of the application you will build by following the tutorial. The browser page contains two tables: one with department data and one with employee data. It also contains a read-only form showing data in the most recently selected table row. Figure 2: Updating the parent page form by selecting a row in a region The page fragments that contain the departments table and the employees table are exposed by two separate regions. Whenever a user selects a new row in either the departments table or the employees table, the selected row data is sent from the bounded task flow in the region to the parent page for display. Configuring the Sample Application To follow the steps in this article, you need the studio edition of Oracle JDeveloper 11g Release 2 (11.1.2.3), available as a free download on Oracle Technology Network. You also need access to an Oracle Database instance with an unlocked HR schema. Get started by downloading the o33adf-1916752.zip sample application file and unzipping the file. The first task is to change the database connection to point to your HR database schema: 1. Launch Oracle JDeveloper 11g Release 2. From the Oracle JDeveloper menu bar, select File -> Open, and navigate to the directory containing the unpacked sample application. 2. Open the OramagSample050613/Starter/RegionParentCommunication folder, and select the RegionParentCommunication.jws file. Click Open to load the workspace. 3. From the View menu, select Database -> Database Navigator, and expand the RegionParentCommunication node to display the hrconn node. 4. Right-click hrconn, and select Properties from the context menu. Edit the database connection information to work with your setup. Test the changes, and click OK. Next, start the Oracle WebLogic Server instance integrated with Oracle JDeveloper. To do so, select Start Server Instance from the Run menu. If this is the first time you’ve run the integrated Oracle WebLogic Server, a Create Default Domain dialog box will open. Create a password for the default Oracle WebLogic Server domain, and select an address from those listed for Listen Address. For example, choose localhost rather than leaving the address empty. Click OK to save the changes and to create and configure the Oracle ADF default domain. Hands-on Overview The RegionParentCommunication.jws workspace you opened in Oracle JDeveloper 11g Release 2 is the starting point for the following hands-on instructions. All the task flows, page fragments, and implementation code have already been prepared, so you can focus on configuration of the region-to-parent-page communication. You will perform the following tasks in this tutorial: • Set up the departments task flow to accept a managed bean reference as an input parameter, and store the bean reference in a managed bean you create in the departments task flow pageFlow scope. Note that this step has already been done for the employees task flow to save you from unnecessary repetition. • Override the SelectionListener property of the Oracle ADF Faces table within the DepartmentsView.jsff fragment to post selection change notification to the task flow of the parent page. • Create a managed bean in view scope of the parent task flow to be passed as an argument to both the employees task flow and the departments task flow. • Add the two regions to the parent page, and reference the viewScope managed bean as an input parameter. Because parts of the sample application have already been created, it is important that you follow the hands-on instructions closely. A completed sample, for which you need only to configure database access, is provided in the download. Setting Up the Department Task Flow For the departments task flow to hold a reference to a managed bean defined in the parent task flow, you need to create a managed bean in the bounded task flow to store the bean reference. You also need an input parameter that receives the reference at runtime. Follow the steps below to complete those tasks: 1. In the Oracle JDeveloper Application Navigator, expand the ViewController project in the RegionParentCommunication workspace. 2. Expand the Application Sources folder, and navigate to the btf package node within the oramag.mayjun.thirteen.view.beans package. 3. Right-click the btf node, and choose New from the context menu. 4. In the New Gallery dialog box, select General -> Java and then Class. 5. Click OK. 6. In the Create Java Class dialog box, set the value of Name to DepartmentsPageFlowBean. 7. Click the magnifier icon next to the Extends field to open the class browser. 8. In the class browser, select the Hierarchy tab and scroll to the oramag package node. 9. Expand the oramag -> mayjun -> thirteen -> view -> beans -> shared package nodes. 10. Select the TaskFlowPageFlowBean class, and click OK twice. 11. In the Java editor that appears, add the following line above the class constructor: private ParentHandle parentHandle = null; When you type the line above, the Importing pop-up dialog box will appear to import the class. Type Alt + Enter to confirm the import. 12. Select the parentHandle variable with the right mouse button, and choose Generate Accessors from the context menu to create a pair of setter and getter methods. 13. Select OK in the Generate Accessors dialog box, after ensuring that the setParentHandle and getParentHandle methods are selected. 14. Save your work. At this point, you have successfully created the Java class you will configure in the next step as a managed bean in the departments task flow. The ParentHandle class variable will later store the reference to the parent task flow managed bean. Note that ParentHandle is a Java interface class that defines the contract between the parent flow bean and the managed bean in the bounded task flow that stores the reference. The TaskFlowPageFlowBean class, one of the precreated helper classes in this sample, contains the implementation details for the bounded task flow for passing row data to the parent page. By extending this class, you have fully implemented the functionality required by the sample. The next step is to configure the DepartmentsPageFlowBean class as a managed bean in pageFlow scope in the departments task flow. 15. In the ViewController project, expand the Web Content -> WEB-INF and btf folders. 16. Double-click the departments-task-flow.xml file to open the task flow in the diagram editor. 17. In the departments-task-flow.xml diagram, click the Overview tab at the bottom. 18. Select the Managed Beans menu entry, and click the green plus (+) icon to the right of the Managed Beans label. 19. Set the Name field value to departmentsFlowBean, and click in the Class field. 20. Click the down-arrow icon on the right and then the Edit menu entry to open the class browser. 21. Select the Hierarchy tab (if it’s not already selected), and scroll to the oramag package node. Expand the oramag -> mayjun -> thirteen -> view -> beans -> btf node, and select DepartmentsPageFlowBean. Click OK. 22. Set the Scope field to pageFlow so the managed bean is accessible as long as the departments task flow instance is active. 23. Save your work. Next create a new input parameter for the departments task flow that expects an input value of type ParentHandle to save in the departmentsFlowBean you just configured. 24. Go back to the opened departments-task-flow.xml window, and make sure the Overview tab is selected at the bottom. 25. Select the Parameters menu entry, and click the green plus (+) icon to the right of Input Parameter Definitions to create a new input parameter. 26. Set the Name field value to parentHandle, and click in the Class field. 27. Click the down-arrow icon on the right and then the Edit menu entry to open the class browser. 28. Select the Hierarchy tab (if it’s not already selected), and scroll to the oramag package node. Expand the oramag -> mayjun -> thirteen -> view -> beans -> interfaces package nodes, and select the ParentHandle interface class. 29. Click OK. 30. Click in the Value field. Click the down-arrow icon on the right, and choose Expression Builder from the context menu. 31. In the Expression Builder dialog box, expand the ADF Managed Beans and pageFlowScope folders. 32. Expand the departmentsFlowBean node, select parentHandle, and click OK. 33. Check the Required checkbox, and save your work. In this section, you created a managed bean you will reference as the value target of a new bounded task flow input parameter.

Identify the types of components that cooperate to provide the business service implementation

Entity object An entity object represents a row in a database table and simplifies modifying its data by handling all data manipulation language (DML) operations for you. It can encapsulate business logic to ensure that your business rules are consistently enforced. You associate an entity object with others to reflect relationships in the underlying database schema to create a layer of business domain objects to reuse in multiple applications. View object A view object represents a SQL query and simplifies working with its results. You use the SQL language to join, filter, sort, and aggregate data into the shape required by the end-user task being represented in the user interface. This includes the ability to link a view object with other entity objects to create master-detail hierarchies of any complexity. When end users modify data in the user interface, your view objects collaborate with entity objects to consistently validate and save the changes. Application module An application module is the transactional component that UI clients use to work with application data. It defines an updateable data model along with top-level procedures and functions (called service methods) related to a logical unit of work related to an end-user task. More on: http://download.oracle.com/docs/cd/E15523_01/web.1111/b31974/intro.htm#BHCFFJHC

[  ]

Explain how ADF BC components are used in a Web Application Check: http://download.oracle.com/docs/cd/E15523_01/web.1111/b31974/bcdcpal.htm#CIHJFEJF http://download.oracle.com/docs/cd/E15523_01/web.1111/b31974/bcdcpal.htm#BBJBDCHF

Querying and Persisting Data
[  ]	Describe the characteristics of an ADF BC view object
[  ]	Create a view object that can be used for performing a query in a Web application
[  ]	Define a SQL statement on which to base a query for a view object
[  ]	Explain how entity objects relate to database tables
[  ]	Describe the persistence mechanism of entity objects
[  ]	Use the Create Entity Object wizard to generate entity objects from database tables
[  ]	Create associations between entity objects to represent business relationships
[  ]	Create updatable view objects based on entity objects
[  ]	Link view objects to one another in a master-detail hierarchy
[  ]	Refactor objects in an application

Exposing Data to Clients
[  ]	Explain the role of application modules
[  ]	Describe the characteristics of application modules
[  ]	Use the Create Application Module wizard to define the data model for an application module
[  ]	Explain how application modules can manage business components transactions
[  ]	Explain how application modules can manage application stateE
[  ]	Explain the role of the ADF Model

Declaratively Customizing Data Services
[  ]	Declaratively change data behaviour
[  ]	Declaratively modify the default behavior of view objects, entity objects, and application modules
[  ]	Define a view accessor for a list of values(LOV)
[  ]	Define a list of values (LOV) for an attribute

Programmatically Customizing Data Services
[  ]	Generate Java classes for business components to modify default behavior programmatically
[  ]	Override class methods to change or augment default behavior
[  ]	Modify the WHERE clause of a view object at run time
[  ]	Explain the benefits of adding service methods at the application module level (rather than at the view level)
[  ]	Create a test client for testing your custom code
[  ]	Modify a view object's client code to add a new employee to the employees view object

Validating User Input
[  ]	Describe the types of validation available for ADF applications
[  ]	Evaluate which validation options are appropriate for different validations
[  ]	Add declarative validation for an entity object
[  ]	Identify the other non-declarative validation options and when they might be used
[  ]	Describe the benefits of using domains for validation

Troubleshooting ADF BC Applications
[  ]	Identify the JDeveloper tools for logging and diagnostics
[  ]	Use Java code auditing tools
[  ]	Make use of FileMon and Junit to debug an application
[  ]	Use the JDeveloper profiler
[  ]	Use the JDeveloper debugger
[  ]	Identify sources of Help

Understanding UI Technologies
[  ]	Describe the use of Web browsers and HTML
[  ]	Explain how Java has come into widespread use as a language for developing Web applications
[  ]	Describe the function of Servlets and JSPs
[  ]	Define JavaServer Faces
[  ]	Explain the JSF component architecture
[  ]	Expalin some JSF component types included in the standard implementation
[  ]	Describe the purpose of backing beans
[  ]	Describe the JSF life cycle
[  ]	Explain how ADF Faces augments the JSF life cycle

Binding UI Components to Data
[  ]	Create an empty JSF page
[  ]	Use three different ways to add ADF Faces UI components to a page
[  ]	Describe the types of data-bound components that can be added to a JSF page
[  ]	Describe the structure of an EL (Expression Language) expression

Planning the User Interface
[  ]	Describe the Model-View-Controller design pattern
[  ]	Differentiate between bounded and unbounded task flows
[  ]	Create task flows to define control flow in an application
[  ]	Specify control flow rules
[  ]	Define global navigation
[  ]	Use routers to declaratively route control flow to activities based on an EL expression
[  ]	Define the role of managed beans in task flows
[  ]	Explain the types of validation available in the user interface

Adding Functionality to Pages
[  ]	Internationalize the user interface so that the application can be used in multiple locales
[  ]	Use component facets to specify subordinate elements such as toolbars, headers and footers
[  ]	Implement a list of values (LOV) to enable users to select a value from a list
[  ]	Add a calendar component to an input date field to make it easy for users to select a date
[  ]	Use the table component to display structured data as a formatted table
[  ]	Employ the tree component to display hierarchical data
[  ]	Add icons and images to an application with ADF Faces output componentsE
[  ]	Create Search forms using the ADF query component
[  ]	Use ADF Data Visualization components to add charts, graphs, map etc to your JSF pages

Implementing Navigation on Pages
[  ]	Implement command buttons and links
[  ]	Create menus - Menu bar
[  ]	Create menus - Popup
[  ]	Create menus - Context
[  ]	Use a navigation page
[  ]	Use breadcrumbs
[  ]	Create trains

Achieving the Required Layout
[  ]	Build complex page layouts with layout components
[  ]	Explain the role of ADF Faces skins
[  ]	Use dynamic page layout

Ensuring Reusability
[  ]	Identify the benefits of reusing components
[  ]	Create a resource catalog to enable sharing of resources within and across teams and applications
[  ]	Create ADF libraries to share components within and across teams and applications
[  ]	Create a task flow template for reuse across different bounded task flows
[  ]	Create a page template for reuse across the JSF pages in an application to enable a consistent look and feel
[  ]	Create a declarative component for reuse in different pages of an application
[  ]	Create a page fragment to use in multiple pages of the application
[  ]	Employ a bounded task flow as a region in a JSF page

Passing Values between UI Elements
[  ]	Evaluate whether the data model contains opportunities to reduce the need for passing values between pages
[  ]	Use a managed bean to pass values between JSF pages
[  ]	Store values in memory-scoped attributes to hold and pass information between pages and life cycle phases
[  ]	Use parameters to pass information to different parts of the application

Responding to Application Events
[  ]	Configure managed beans to contain code to respond to events
[  ]	Explain the different types of events
[  ]	Use phase listeners to listen for and respond to events
[  ]	Explain the role of an event listener
[  ]	Use action listeners
[  ]	Describe the sequence in which events and listeners are executed
[  ]	Describe the features of JDeveloper that support ADF Faces enhanced event handling
[  ]	Identify the server events fired by ADF Faces components/span>
[  ]	Use the contextual events framework to co-ordinate regions on a JSF page

Implementing Transactional Capabilities
[  ]	Explain ADF BC transaction handling
[  ]	Enable an ADF bounded task flow to run as a transaction
[  ]	Manage transaction exceptions on ADF bounded or unbounded task flows
[  ]	Define the response to the browser's Back button (for an ADF task flow that was already exited)
[  ]	Implement Save for Later functionality

Implementing Security in ADF BC Applications
[  ]	Explain the need to secure applications
[  ]	Describe security aspects of an ADF BC application
[  ]	Add ADF Security Authentication to an application
[  ]	Add ADF Security Authorization to an application
[  ]	Use two approaches for granting users access to resources
[  ]	Prevent unauthorised access to the ADF BC Model
[  ]	Explain the types of application authentication at run time
[  ]	Use Expression Language to extend the default security capabilities of the framework

Explore the Project Structure and Core File Architecture
[  ]	Define File Structure of a Project
[  ]	Examine how Metadata files are used to specify paramters, methods, and return values to a data control
[  ]	Define ADF Data Control and Databinding Files
[  ]	Explore the ADF Faces and Web Configuration Files to know where task flows, pages and code are created
[  ]	Define Hierarchical Relationship of the XML Metadata files in a Web Application

Extend the ADF Business Components Framework
[  ]	Examine some general considerations when using ADF Business Components
[  ]	Extend the ADF Business Components (ADF BC) Framework to customize your application
[  ]	Override the standard way data is committed to the database using a PL/SQL procedure
[  ]	Design ADF Business comonents to avoid database contraint

Use ADF Business Components for Validation, Calculations and List of Values
[  ]	Build Cascading List of Values
[  ]	Enhance the Application with Calculations and Validation
[  ]	Create Validation for Foreign Keys
[  ]	Employ Groovy Expressions in Validations

Use Inheritance in the Business Domain Layer
[  ]	Reuse existing Bussiness Component designs by extending components
[  ]	Implement Supertype/Subtype designs using Entity Objects
[  ]	Create View Objects to access more than one table

ADF as a part of a Service Oriented Architecture
[  ]	Expose ADF Business Components as SDO for use in a SOA Process (BPEL)
[  ]	Create Rich User Interfaces that access data from a composite application
[  ]	Create events for ADF Business Components to trigger Enterprise Service Bus
[  ]	Use Service Data Objects to access heterogeneous data in a uniform way

Implement Data Binding Controls
[  ]	Define and Recognize ADF Model binding types
[  ]	Define ADF Model executables and how to use them
[  ]	Customize data-bound components within the page definition file to support application requirements
[  ]	Use Expression Language to connect page items to model components
[  ]	Determine how model components get transformed into Data Control Palette items

Practical Data Binding in Action
[  ]	Examine data binding in the JavaServer Faces (JSF) Page life cycle
[  ]	Define listeners and custom controllers to augment the ADFm life cycle
[  ]	Develop two different style queries: Query by example and Query using Google style
[  ]	Develop two different types of list of allowable values: Static lists and Dynamic lists

Work with Managed Beans and JavaServer Faces
[  ]	Define key JavaServer Faces (JSF) terms
[  ]	Describe the JSF Architecture with Application Development Framework (ADF)
[  ]	Differentiate between Managed and Backing Beans
[  ]	In a JSF page, create and reference a Managed Bean to perform a custom method
[  ]	Set and use Managed Properties to store and retrieve user login information
[  ]	Use context object classes to access application messages, work with the Servlet API or ADF specific funcationality

ADF Faces Advanced Features
[  ]	Examine AJAX and ADF
[  ]	Employ Partial Page Rendering (PPR) on a JSF Page
[  ]	Enhance a page by creating input and output items using ADF Components
[  ]	Use page, panel and splitter componentss to design and build a JSF page
[  ]	Develop UI shell templates to incorporate company standard behavours, look and feel
[  ]	Display numerical data using Data Visualization components and Active Data Services

Integrate with WebCenter
[  ]	Allow end users to perform runtime customization to their application pages
[  ]	Integrate ADF pages with Content Management systems to access file systems
[  ]	Add Web Center Services, like social networking and collaboration, to JSF/ADF pages
[  ]	Add reusable Portlets that provide dynamic view of data, into a JSF/ADF page

Customize the Application Look and Feel with Skins
[  ]	Use Firebug and Mozilla Developer Toolbar to build skins
[  ]	Explain how skin selectors work
[  ]	Build instance specific skins
[  ]	Develop a managed bean to change skin at runtime

Dig more/References:

• Oracle JDeveloper 11g Handbook . This book by Duncan Mills really helps to answer many of the above. If you are a newbie consider buying ( http://www.amazon.co.uk/Oracle-JDeveloper-11g-Handbook-Development/dp/B001NLL53Q/ref=sr_1_4?ie=UTF8&s=digital-text&qid=1294509536&sr=8-4)
• http://xmlandmore.blogspot.com
• http://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=41&p_org_id=1001&lang=US&p_exam_id=1Z0_554#3