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Home > Web Development > Front End Web Development > Developing Web Applications with Oracle ADF Essentials
Developing Web Applications with Oracle ADF Essentials
Developing Web Applications with Oracle ADF Essentials

Developing Web Applications with Oracle ADF Essentials: Quickly build attractive, user-friendly web applications using Oracle's free ADF Essentials toolkit

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Developing Web Applications with Oracle ADF Essentials

Chapter 2. Creating Business Services

Now that we have set up all the necessary software and have built a simple application to verify it, we can start building real-life ADF applications. Remember that an ADF application consists of the following layers as:

In this chapter, we will concentrate on the Business Service layer. First, we will discuss business services in general, then we will build some necessary base components, and finally we will build the necessary ADF Business Components (ADF BC) for the sample application described in the introduction.

Business service possibilities

The business service layer is doing most of the work that the application performs, such as delivering data, accepting instructions to create, change, or remove data, and performing more complicated calculations and operations. This layer interacts with the user interface part of the application through the use of ADF bindings.

There are several ways of building business services in an ADF application, but by far the easiest is to use ADF Business Components (ADF BC) based on database tables. This is the approach taken in this book and in many tutorials on ADF development. If you are just starting out with ADF, you should definitely master this way of building applications first.

Other alternatives are:

  • Building Plain Old Java Objects (POJOs) to encapsulate some other data source (for example, web services) and then creating data controls based on these POJOs.

  • Building Business Components on top of other data sources rather than on top of database tables. This...

ADF Business Components

The ADF Business Components architecture has five types of components, listed as follows:

  • Entity objects

  • Entity associations

  • View objects

  • View links

  • Application modules

You can think of Entity Objects as representations of your database tables — there will be one entity object for every table your application uses.

Tip

You can also base Entity Objects on database views, as long as these database views are updatable. See http://dev.mysql.com/doc/refman/5.6/en/view-updatability.html for information on when MySQL views are updatable. In some databases (for example, Oracle), you can define special INSTEAD OF triggers to make views updatable.

Entity objects take care of the object-relational mapping and perform many optimizations for you; for example, entity objects cache data in the middle ties to save database round trips.

Similarly, you can think of Associations as representations of the relations between tables in your relational database –– there will normally be one association...

Starting the example application

Through out this book, we will be building a small application based on the Sakila MySQL demo database, which contains data objects for a chain of DVD rental stores.

If you want to follow along in JDeveloper as you read, create a new application using the Fusion Web Application template. Navigate to File | New to bring up the New Gallery dialog box and in this dialog, navigate to Applications | Fusion Web Application (ADF).

In step 1 of the wizard, name your application something like RentalApp and provide an application package prefix that makes sense to you –– if you work for company.com, you could use com.company.adfdemo.

Tip

When working through the examples, in this book you can either use the exact example names or modify the names of objects, classes, methods, and so on, slightly from what the book says. If you use the suggested names, you will get through the examples quicker. If you change the names, you will experience some errors as you go along, so...

How ADF business components work

When you create an ADF business component (entity object, view object, and so on), JDeveloper initially creates only an XML file describing the object (which table, which attributes, and so on). Part of the XML file for an entity might look like as follows:

<?xml version="1.0" encoding="windows-1252" ?>
...
<Entity
  xmlns="http://xmlns.oracle.com/bc4j"
  Name="Film"
  Version="11.1.2.64.36"
  DBObjectType="table"
  DBObjectName="sakila.film"
...
  <Attribute
    Name="FilmId"
    IsNotNull="true"
    ColumnName="film_id"
    SQLType="SMALLINT"
    Type="java.lang.Integer"
    ColumnType="SMALLINT"
    TableName="sakila.film"
    PrimaryKey="true">
...
</Entity>

At runtime, the ADF framework automatically creates and runs the Java classes that read these XML files. For example, ADF creates an instance of the oracle.jbo.server.EntityImpl class whenever ADF needs to work with an entity object. The specific instance of the class reads the...

Building your own foundation

The ability to create your own Java implementation classes is a powerful feature, but it can be made even more powerful by inserting an extra layer in the object hierarchy.

If you generate Java as described previously, every one of your Java classes is wired directly to one of Oracle's classes. This is not a good idea –– in case you decide that you want some new feature built into every entity implementation class, you would have to change each of the individual classes (FilmImpl, RentalImpl, and so on).

Fortunately, there is a better way: you can create your own framework extension classes. These are sets of classes that extend the Oracle-supplied classes and sit between your specific implementation class and the Oracle-supplied class. For example, you can create your own com.company.adf.framework.EntityImpl class that extends the Oracle-supplied class (oracle.jbo.server.EntityImpl), and then let your specific implementation classes (for example, FilmImpl) extend...

Building entity objects for the example application

In order to illustrate the process of building business components, we will build the necessary objects to show customers and their rentals. This will involve the following objects in the Sakila database:

  • customer

  • rental

  • inventory

  • film

Preparing to build

Before you start creating entity objects, you need to create a connection to the database inside your application. This is done like in Chapter 1, My First ADF Essentials Application, by navigating to File | New | Connections | Database Connection. Give your connection a name, choose Connection type MySQL, fill in username (root), password, port (default is 3306), and database name (sakila). You don't need to select a library again –– JDeveloper has associated the library you defined in Chapter 1, My First ADF Essentials Application permanently with MySQL connections.

Another thing you want to do before building the business components is to tell JDeveloper which Java packages the various...

Building view objects

Entity objects are created one-to-one, matching the database tables you will be using –– there are no design decisions to make when creating entity objects. View objects, on the other hand, represent the data you need for a specific use case or screen, so you need to have a good idea of the application you want to build before you can create useful view objects.

The storyboard

For the purpose of this book, we will be building a simple customer lookup screen, followed by a master-detail screen showing customers satisfying the search criteria; and for each customer, the films they have rented and not returned. It should look something like the following diagram:

Tip

Rough sketches of screens like these are called wireframes, and a collection of screens with navigation is called a storyboard. The preceding diagram was created with the specialized wireframing tool Balsamiq Mockups (http://www.balsamiq.com). It's a good idea for your organization to decide on a common tool to...

Application module

Now we have two view objects with all the data we need and we have defined the connection between them. The final business component we need to create is an Application Module. Navigate to File | New | Business Tier | ADF Business Components | Application Module to start the Create Application Module wizard:

  1. In step 1 of the wizard, give the application module a meaningful name (for example, RentalService).

  2. In step 2, expand the .view node to see your two view objects. First click on CustomerVO on the left. In the New View Instance field under the list of available view objects, change the name to CustomerSearchResult as shown in the following screenshot:

    • Click on the > button to create a view object instance in the right-hand box.

    • Then expand the CustomerVO node to the left to see the node RentalVO via CustomerRentalLink. Select this node and give it the name RentalUnreturned in the New View Instance field, and then shuttle it to the right. It should appear under the CustomerSearchResult...

Testing business components

This completes our business service layer. So far, we have created:

  • Entity objects

  • Associations

  • View objects with view criteria

  • A view link

  • An application module

In many development teams, tasks are split between developers with some building business services and some building the user interface. Naturally, the developers building business services need a way to test their work without having to wait for the UI developers to finish their work. JDeveloper offers this in the form of the Business Components Tester.

To run this tester, simply right-click on the application module and select Run. This will start up the built-in tester application that will show the view object instances in your application module, as shown in the following screenshot:

You will be prompted for bind variable values when you activate a view object that needs them.

You can navigate through data, change data, and even create or delete records through the business component tester application.

Note...

Summary

We have built our own foundation classes for our business components and have created the business services we need for our simple example application. This includes entity objects and associations, view objects, view criteria, a view link, and an application module exposing our business service to the rest of the application. In the next chapter, we will be building the frontend of our application based on these business services.

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Key benefits

  • Quickly build compete applications with business services, page flows, and data-bound pages without programming
  • Use Java to implement any business rule or application logic
  • Choose the right architecture for high productivity and maintainability
  • Follow a common example application that illustrates the key concepts throughout the book

Description

With ADF, Oracle gives you the chance to use the powerful tool used by Oracle's own developers. Modern enterprise applications must be user-friendly, visually attractive, and fast performing. Oracle Fusion Applications are just that; but to get the desired output you need proven methods to use this powerful and flexible tool to achieve success in developing your enterprise applications. "Developing Web Applications with Oracle ADF Essentials" explains all you need to know in order to build good-looking, user-friendly applications on a completely free technology stack. It explains the highly productive, declarative development approach that will literally have your application running within a few hours, as well as how to use Java to add business logic. "Developing Web Applications with Oracle ADF Essentials" tells you how to develop and deploy web application applications based on the highly productive and free Oracle ADF Essentials framework. You will first learn how to build business services on top of database tables, and then how to easily build a web application using these services. You will see how to visually design the flow through your application with ADF task flows, and how to use Java programming to implement business logic. Using this book, you can start building and deploying advanced web applications on a robust, free platform quickly. Towards the end, you will be ready to build real-world ADF Essentials applications and will be able to consider yourself an ADF Essentials journeyman.

Who is this book for?

"Developing Web Applications with Oracle ADF Essentials" is for you if you want to build modern, user-friendly web applications for all kinds of data gathering, analysis, and presentations. You do not need to know any advanced HTML or JavaScript programming. Business logic can be implemented by adding Java code at well-defined hook points, so you do not need do know advanced object-oriented programming—regular Java programming skills are enough.

What you will learn

  • Set up a complete, free development environment with MySQL, GlassFish, JDeveloper, and ADF Essentials
  • Create business services based on database tables ‚Äì without programming
  • Visually design your application with ADF task flows
  • Build application pages with advanced user interface components, automatically mapping them to business services
  • Add business logic with regular Java programming, working with user interface elements and database data
  • Divide your application into reusable ADF libraries for efficient development in larger teams
  • Debug your application through all layers of the architecture
  • Implement role-based security
  • Set up automated build processes
  • Package and deploy your application to test and production environments
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Publication date : Aug 27, 2013
Length: 270 pages
Edition : 1st
Language : English
ISBN-13 : 9781782170686
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Category :
Web Development
Concepts :
Front End Web Development
Tools :
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Publication date : Aug 27, 2013
Length: 270 pages
Edition : 1st
Language : English
ISBN-13 : 9781782170686
Vendor :
Oracle
Category :
Web Development
Concepts :
Front End Web Development
Tools :
Oracle ADF

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Table of Contents

8 Chapters
My First ADF Essentials Application Chevron down icon Chevron up icon
My First ADF Essentials Application
Getting ready
Installing MySQL
Installing Java Development Kit and GlassFish
Installing ADF Essentials
Installing JDeveloper
Building a simple ADF Essentials application
Can it run faster?
Summary
Creating Business Services Chevron down icon Chevron up icon
Creating Business Services
Business service possibilities
ADF Business Components
Starting the example application
How ADF business components work
Building your own foundation
Building entity objects for the example application
Building view objects
Application module
Testing business components
Summary
Creating Task Flows and Pages Chevron down icon Chevron up icon
Creating Task Flows and Pages
Building task flows
Building pages
Using data bindings
Summary
Adding Business Logic Chevron down icon Chevron up icon
Adding Business Logic
Adding logic to business components
Adding logic to the user interface
Example application
Summary
Building Enterprise Applications Chevron down icon Chevron up icon
Building Enterprise Applications
Structuring your code
Using version control
Working with ADF libraries
Example application
Summary
Debugging ADF Applications Chevron down icon Chevron up icon
Debugging ADF Applications
ADF logging
Logging in GlassFish
Debugging in JDeveloper
Summary
Securing an ADF Essentials Application Chevron down icon Chevron up icon
Securing an ADF Essentials Application
Apache Shiro basics
Advanced Shiro
Implementing authorization
Summary
Build and Deploy Chevron down icon Chevron up icon
Build and Deploy
Creating a build script
Automated deployment to GlassFish
Integrating other functionality in your build
Preparing to go live
Summary

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rajksivan Jul 16, 2016
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For Basic level this is wonderful book.
Amazon Verified review Amazon
vinaykumar Nov 12, 2013
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
This book contains 8 chapter -Chapter 1. My First ADF Essentials Application- How to install MySql,JDK, Glassfish.- How you can setup jdev and ADF essential.Chapter 2. Creating Business Services- Give depth knowledge of ADF BC- Creating sample application in ADF BC and testing.Chapter 3. Creating Task Flows and Pages- How you can create pages- How to work in taskflow. Explanation of task flow.I really liked.Chapter 4. Adding Business Logic- Adding custom login in BC classes- Adding logic to UI- Sample applicationChapter 5. Building Enterprise Applications- How to structure your code ,Using sub version.- How to create libraries in ADF- Creating sample application and use these featuresChapter 6. Debugging ADF Applications- How to use ADF logging.- How to do logging in Glassfish- How you can do debugging in JdeveloperChapter 7. Securing an ADF Essentials Application- Most interesting chapter for me.Clearly explained APache shiro .- Advanced features of Apache shiro.- Implementation AuthorizationChapter 8. Build and Deploy- Another interesting topic.How you can build Application- creating script and deploying in glassfish.- Advanced topoc for preparing application for go live.Summary:Good and detailed explanation of ADF essentials what are limitations and how to overcome on it. This book not only cover ADF essentail but whole ADF except ADF security.Very usefull if you want to run your app on glassfish,Jboss or tomcat.Creatomg build script for ADF developer is really usefull. Someone who starting ADF learning, i would really recommend for him
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Zee Oct 21, 2013
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About the Author (In my words)Sten Vesterli is one of the ADF Gurus who contributed to ADF community a lot. He is frequent presenter at global Oracle conferences like Oracle Open World, ODTUG Kscope, IOUG Collaborate and I have always enjoyed his style of presenting and writing. This book is 2nd book by Sten on ADF you can reach him on his website [...] and Twitter [...]Introduction:The book is focused on the FREE version of Oracle ADF called 'ADF Essentials' it contains 8 chapters and about 270 pages.The book takes an example of building a small application and covers a most of the life cycle of ADF Essentials development. The key highlight for me the author is using MySQL database, Glassfish server and Apache Shiro for security. (Security is not part of ADF Essentials license which requires you to work with open source security solutions).Chapter wise ReviewChapter 1: My First ADF Essentials ApplicationFirst chapter will provide you step by step detail how to install and configure MySQL database, Glassfish server and setting up your development environment in JDeveloper. By end of this chapter you will be able to run a basic page developed in JDeveloper, deployed on Glassfish server using MySQL database.Chapter 2: Creating Business ServicesSecond chapter is about working with a Model layer of ADF essentials. The business services as name suggest about setting up back end data model for your application. The author covered quite details about Entity objects, View Objects, View links, Associations and Application Module within a context of example application. There are few best practices tips as well and some bugs fixing tricks.Chapter 3: Creating Task Flows and PagesThird chapter takes you to more interesting part of working with ADF essentials which is View Controller layer. View layer is where you develop pages and control the flow of your application. The author explained enough information to work with the best practices like templates, memory scopes and internationalization. By end of this chapter you will have a search page with a result table of your application.Chapter 4: Adding Business LogicChapter four as name suggests about adding business logic in your application. The chapter includes topics with working with DML, database triggers, Java methods and Managed beans. There is a quite a lot java code there but it is relevant. At this point the example application is pretty much complete.Chapter 5: Building Enterprise ApplicationsChapter five talked about best practices and setting up your project for an enterprise application. This chapter answers most of the common FAQs for ADF newbies and guide you how to setup projects, version controls, how to make reusable libraries so you can share the code across teams and applications. In this chapter you will be merging all your code into one single master application.Chapter 6: Debugging ADF ApplicationsIn this chapter you will learn how to debug ADF application. What are best practices for using logging framework in ADF, JDeveloper and Glassfish server.Chapter 7: Securing an ADF Essentials ApplicationChapter seven is my favorite chapter. When ADF essentials came out, the missing security feature raised quite few questions in the community but this chapter gave you all what you need to do if you are building secure applications with ADF essentials. The chapter explains detail steps how to configure Apache Shiro with your application and using database table based user repository.Chapter 8: Build and DeployThe final chapter of the book talked about how to build and deploy your application using Apache Ant and other tools and what you need to know if order to deploy ADF applications successfully.Final Thoughts:I think this book provides a very good overview of what you can do with ADF essentials what are limitations and how to overcome on it. This details not only valid for ADF essentials but also works with full version of ADF.I find this book could be a great help for who are just going to start ADF development.Cheers,Zeeshan [email protected]
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Brent Oct 27, 2014
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In general, this book is well-written/edited, clearly presented, and targeted toward becoming productive with ADF. It should, absolutely, be part of the newcomer's library. It takes the reader through the execution of a clearly explained vision for a basic and realistic web application. The average reader should have minimal problems following this book as a walkthrough-style tutorial. It is an excellent book for this purpose.Unfortunately, I found that, in general, it was too focused on walking the reader through the creation of example application that it frequently fails to adequately explain why we're doing a certain thing, or what other possibilities are available.I do not believe that the average reader could build a real-world application after reading only this book. But, it is a good step in the right direction.I have also reviewed 'Oracle ADF 11gR2 Development - Beginner's Guide' by Vinod Krishnan. I found the combination of this book and Krishnan's book to contain the right mixture when used in tandem - introductory enough for a newcomer, but thorough enough to make the reader productive.Bottom line: ADF is really not that complicated if you have a basic background in Java and tiered development. The terminology is a big barrier, because it is frequently the case that the only way to explain what a particular new term means is by using a number of other new terms to describe it. It takes some time to get over this hurdle, and, I've found, it seems that every author who writes about ADF is somewhat insensitive to this problem for newcomers. But, to have the same concept described by two different people from somewhat different perspective - this helps tremendously.So, my advice is to start with 'Developing Web Applications with Oracle ADF Essentials'. If you get lost or find that you are not getting good depth-of-subject, pick up 'Oracle ADF 11R2 Development Beginner's Guide'. Or, if you've already got the Beginner's Guide, set it aside after Chapter 6, and pick up this book, starting at Chapter 2.
Amazon Verified review Amazon
Kartones Oct 14, 2013
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I am quite newbie in the Java world, and I have only done an academic use of the Oracle ecosystem (and mostly just the database). I come from a .NET work so comparisons are unavoidable.ADF stands for Application Development Framework, a huge FW to build all kind of applications using good practices like business entities, data abstraction (it includes a huge ORM), MVC webpages with few lines of code, data bindings....The problem with it, and the reason why this book might be interesting for you, is that ADF seems to suffer the Enterprise Java illness: So many pieces, with version incompatibilities, frameworks and packages supported only in some revisions, others needing manual tweaks and configuration changes...ADF presents itself as "build without coding", and indeed you can build basic management apps without a single line of code, but you will for sure spend quite some time fighting with configuration of pretty basic things like database or source code control.This book guides you on quite a lot of those caveats, not only showing the most basic configuration-driven examples but also going later into creating custom business layers, data bindings and securing ADF Essentials (using Apache Shiro because the free version of ADF comes without a security layer...).It has lots of screenshots, step by steps and I think everyone will have an easy time following it. Also hints to more advanced topics by providing links to blog posts.If you want a book in depth for ADF this might not be yours, but if you are learning ADF from scratch, definetly a good choice.
Amazon Verified review Amazon

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