To add a classpath variable to the Java build path of a project, follow these steps:
Hint: You can add multiple variable entries at once to the Java build path:
Select more than one variable in the New Variable Classpath
Entry dialog, or multiple JAR files in the Variable Extension dialog.
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