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Building Applications with Oracle JDeveloper 10g

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Objectives

After completing this lesson, you should be able to do the following:

• Create new projects, workspaces, and applications

• Build Java applications in JDeveloper

• Enhance user interface frame design

• Debug an application by using JDeveloper debugger

• Define classes by using JDeveloper

• Describe how JDeveloper can be used to build enterprise applications

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What Is Oracle JDeveloper 10g?

• Oracle JDeveloper 10g provides an integrated development environment (IDE).

• Build, compile, and run Java applications by using Oracle JDeveloper.

• Use wizards to help build source code.

• View objects from many perspectives: code, structure, layout, and so on.

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Exploring the JDeveloper Environment

System Navigator Code Editor Property Inspector

Component Palette

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Examining Workspaces

• Contain multiple projects

• Enable you to view currently used objects

Workspace

Navigator pane

Structure pane

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What Are Projects?

• Contain related files

• Manage project and environment settings

• Manage compiler and debug options

Project

Projectfiles

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Creating JDeveloper Items

• JDeveloper items areinvoked by selecting File > New.

• They are categorized by type:– General– Business Tier– Client Tier– Database Tier– Web Tier

• Create any JDeveloper element.

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Creating an Application Workspace

In the General category, select Application Workspace to invoke the Property pane.

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Specifying Project Details

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Selecting Additional Libraries

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Adding a New J2SE

New J2SE definitions include:• Java executable• A classpath• A source path • A doc path

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Looking at the Directory Structure

JDeveloper creates and stores .java and .class files by using the following convention:

• <ORACLE_HOME>\jdev\mywork• Followed by the workspace

name

• Followed by the project name– \classes\<package name>\– \src\<package_name>\

• Followed by class and src files

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Exploring the Skeleton Java Application

Contains application and frame classes

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Finding Methods and Fields

Find methods and fields by using the Structure pane.

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Supporting Code Development with Profiler and Code Coach

• Improve code quality with Code Coach.

• Evaluate execution stack with Execution Sample profiler.

• Examine heap memory usage with Memory profiler.

• Analyze event occurrence and duration with Event profiler for:– JVM events– Business Components for Java events– Custom events

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Customizing JDeveloper

Customize the IDE

• Look and feel

• General environment

• Dockable windows

• Component Palette

• Load preset keymaps

Rename classes and packages by using refactoring.

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Using the Help System

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Obtaining Help on a Topic

Use [F1] to invoke context-specific Help.

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Oracle JDeveloper 10g Debugger

• Helps find and fix program errors:– Run-time errors– Logic errors

• Allows control of execution

• Allows examination of variables

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Setting Breakpoints

Setting breakpoints:

• Manage multiple breakpoints

• Manage conditional breakpoints

• Define columns displayed in window– Description– Type– Status, and so on

• Control scope of action – Global > Workspace > Project

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Using the Debugger Windows

View Debug information:

• Classes: Displays list of loaded classes and status

• Watch: Evaluates and displays expressions

• Monitors: Displays information about active monitors

• Threads: Displays the names and statuses of all threads

• Smart Data: Analyzes source code near execution point

• … and more

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Stepping Through a Program

Step through a program by using the buttons on the Debugger toolbar:

• Start the debugger.

• Resume the program.

• Step over a method call.

• Step into a method call.

• Step out of a method call.

• Step to the end of the method.

• Pause execution.

• Stop the debugger.

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Watching Data and Variables

• The Smart Data tab displays analyzed variables and fields.

• The Data tab displays arguments, local variables, and static fields from the current context.

• To watch other variables:– Select a variable in the source window and right-

click.– Select Watch... at Cursor from the context menu.– View the variable in the Watch tab.– Right-click a data item to modify it.

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Summary

In this lesson, you should have learned how:

• JDeveloper builds, debugs, and runs all types of Java applications

• JDeveloper can be used to develop:– Java applications– Java servlets– JSPs– EJBs

• JDeveloper can be used to build enterprise applications

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Practice 6: Overview

This practice covers:

• Exploring the Oracle JDeveloper 10g IDE

• Creating a workspace and project

• Including application files from the earlier lesson