Uncaught Exceptions in Visualforce

Visualforce displays extra information when a page encounters errors during execution. This information can help you resolve problems with the page’s code, or at least track down an owner to look further into the problem.

If a Visualforce page that you didn’t develop has an error or uncaught exception:

• You see a simple explanation of the problem in Salesforce.
• The developer who wrote the page receives the error via email with your organization and user ID. No other user data is included in the report.

If you’re in development mode and not in the same namespace as the page, you see the exception message, the exception type, and a notification that the developer was notified by email.

If you’re the developer and in the same namespace as the page, and you are not in development mode, you see an exception message. You might also see a message indicating that the developer has been notified. If you are in development mode, you see the exception message, the exception type, and the Apex stack trace.