AccessRestriction Error with "The Type 'Application' is Not API"

This error occurs when attempting to access non-API classes, such as com.apple.eawt.Application, which are not exposed as part of the Java public API.

Background: Eclipse Access Restrictions

Eclipse employs access restrictions to safeguard developers from using non-API classes that may introduce security or stability concerns. API classes are explicitly defined in the official Java documentation.

Problem: Using Non-API Classes

Some situations arise where it may be necessary to access non-API classes, such as for advanced functionalities or compatibility with specific platforms. In these cases, Eclipse's access restrictions prevent the use of such classes.

Solution: Modifying Access Restrictions

To resolve the error, you can modify the access restrictions in Eclipse by following these steps:

1. Right-click on the project in the Package Explorer and select "Properties."
2. Navigate to "Java Build Path" and then to the "Libraries" tab.
3. Expand the problematic library (e.g., rt.jar).
4. Under "Access Rules," click "Edit..." and then "Add...
5. Create a new resolution with "Accessible" and a corresponding rule pattern (e.g., "com/apple/eawt/**").

This process will allow you to access the necessary non-API classes while preserving the security and stability measures of Eclipse.