Java
development overview
The JDT project provides the tool plug-ins that implement
a Java IDE supporting the development of any Java application, including
Eclipse plug-ins. It adds a Java project nature and Java perspective to the
Eclipse Workbench as well as a number of views, editors, wizards, builders, and
code merging and refactoring tools. The JDT project allows Eclipse to be a
development environment for itself.
Preparing
Eclipse
In this section, you will verify that Eclipse
is properly set up for Java development. The following is assumed:
- You are starting with a new Eclipse installation
with default settings.
- You are familiar with the basic Eclipse workbench
mechanisms, such as views and perspectives.
Verifying
JRE installation and classpath variables
1.
If you still see
the Eclipse Welcome page, click the arrow icon to begin using Eclipse.
2.
Select the menu
item 
Window > Preferences... to open the workbench preferences.
Window > Preferences... to open the workbench preferences.
3.
Select the Java > Installed JREs preference page to display the installed Java Runtime
Environments. Confirm that a JRE has been detected. By default, the JRE used to
run the workbench will be used to build and run Java programs. It should appear
with a checkmark in the list of installed JREs. We recommend that you use a
Java SDK instead of a JRE. An SDK is designed for development and contains the
source code for the Java library, easing debugging. Additional SDKs can be
added by searching the hard drive for installed SDKs. To do so, simply click
the Search... button and specify a
root folder for the search.
If you work with code that does not yet use generics (as we do in this tutorial), we recommend that you install a Java SDK 1.4 as well, but leave the most recent version checked as default.
Java > Installed JREs preference page to display the installed Java Runtime
Environments. Confirm that a JRE has been detected. By default, the JRE used to
run the workbench will be used to build and run Java programs. It should appear
with a checkmark in the list of installed JREs. We recommend that you use a
Java SDK instead of a JRE. An SDK is designed for development and contains the
source code for the Java library, easing debugging. Additional SDKs can be
added by searching the hard drive for installed SDKs. To do so, simply click
the Search... button and specify a
root folder for the search. If you work with code that does not yet use generics (as we do in this tutorial), we recommend that you install a Java SDK 1.4 as well, but leave the most recent version checked as default.
4. Select the General > Workspace preference page. Confirm that the Build automatically option is checked.
General > Workspace preference page. Confirm that the Build automatically option is checked.
5. Select the Java > Build Path preference
page. Confirm that Source and output folder is set to Folders.
Java > Build Path preference
page. Confirm that Source and output folder is set to Folders. 
6. Select the Java > Editor preference
page. Confirm that option Report problems as you type is checked.
Java > Editor preference
page. Confirm that option Report problems as you type is checked. 
7. Select the Java >
Compiler preference page. Confirm that option Compiler
compliance level matches your default JRE version (usually 1.6).
Java >
Compiler preference page. Confirm that option Compiler
compliance level matches your default JRE version (usually 1.6). 
8. Click on OK
to save the preferences.
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