afv-library/skills/platform-apex-generate/assets/exception.cls

/**
 * Custom exception for {describe when this exception is thrown}.
 *              Use this exception to signal domain-specific errors that callers
 *              can catch and handle distinctly from system exceptions.
 *
 * @example
 * throw new {ClassName}('Account merge failed: duplicate detected.');
 *
 * // Wrap a caught exception
 * try {
 *     // ... risky operation
 * } catch (DmlException e) {
 *     throw new {ClassName}('DML failed during account merge: ' + e.getMessage());
 * }
 */
public with sharing class {ClassName} extends Exception {
    // Apex custom exceptions automatically inherit:
    //   - getMessage()
    //   - getCause()
    //   - getStackTraceString()
    //   - setMessage(String)
    //   - initCause(Exception)
    //
    // And support these constructor patterns:
    //   - new {ClassName}()
    //   - new {ClassName}('message')
    //   - new {ClassName}(causeException)
    //   - new {ClassName}('message', causeException)
    //
    // Note: Apex does NOT support custom constructors on Exception subclasses.
    // To add context, use the message string or create a wrapper pattern:
    //
    // Example wrapper pattern (if you need structured error data):
    //
    // public class {ClassName}Detail {
    //     public String errorCode;
    //     public List<Id> failedRecordIds;
    //     public String detail;
    //
    //     public {ClassName}Detail(String errorCode, List<Id> failedRecordIds, String detail) {
    //         this.errorCode = errorCode;
    //         this.failedRecordIds = failedRecordIds;
    //         this.detail = detail;
    //     }
    //
    //     public override String toString() {
    //         return '[' + errorCode + '] ' + detail + ' (Records: ' + failedRecordIds + ')';
    //     }
    // }
}