Adding a classpath variable to the build path

Select the project to which you want to add the classpath variable
From the project's pop-up menu, select Properties

1. In the Properties page, select the Java Build Path page.
2. On the Libraries tab, click Add Variable for adding a variable that refers to a JAR file.
   The New Variable Classpath Entry dialog appears which shows all available classpath variables. You can Edit... New... a variable or create a new variable with New....
   







3. Press New...
4. Enter the variable's name and path then press OK.
5. If the variable resolves to a folder, you have to specify a path extension that points to a JAR. To do this press the Extend... button. If the variable already resolves to a JAR file you can click OK directly.

Classpath variables
Build classpath

Attaching source to a class path variable
Creating Java elements
Defining a class path variable
Deleting a class path variable
Viewing and editing a project's build path

Classpath Variables preference page
Build path properties page