\'Access Restriction: \'The type \'Application\' is not API\' - How Do I Fix This Eclipse Error?\'

Access Restriction: Resolving Errors Using Eclipse Access Rules

Java developers commonly encounter an error that reads: "Access restriction: The type 'Application' is not API." This issue arises when attempting to utilize non-API classes that are not recognized by Eclipse's default access restrictions.

Understanding Access Restrictions

Eclipse's access restrictions are designed to prevent the use of classes not considered part of the public API. This feature aims to safeguard against unintentional usage of internal or private classes.

Cause of the Error

In this case, the error stems from an attempt to access the Application class from com.apple.eawt, which is not part of the standard Java API. Eclipse's access restrictions prevent such usage.

Resolving the Issue

To resolve the error, we need to modify Eclipse's access rules to explicitly allow the use of the desired non-API classes.

Steps to Modify Access Rules

1. Open the Properties dialogue box for your Java project.
2. Navigate to the "Java Build Path" tab.
3. Select the "Libraries" tab.
4. Expand the Java Runtime Environment (JRE) node.
5. Navigate to the "Access rules" entry.
6. Click "Edit..." and then "Add..."

7. Create a new access rule with the following settings:

   • Resolution: Accessible
   • Rule pattern: com/apple/eawt/** (or javax/smartcardio/** for the example mentioned in the assistant's response)

Additional Notes

• Make sure to use the correct rule pattern based on the package of the non-API classes you wish to access.
• Changing access rules should be done with caution. Avoid granting access to classes that are not explicitly intended for external use.
• If the issue persists despite these steps, verify that the correct JRE has been selected in your project's build path configuration.

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