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} catch (error) { if (error instanceof UserNotFoundException) { // Very specific: handle this particular failure mode return notFound(`User not found: ${error.userId}`); } else if (error instanceof ValidationError) { // Medium specificity: any validation failure return badRequest(error.validationErrors); } else if (error instanceof BusinessError) { // Broader category: any business rule violation logger.warn("Business rule violated", error); return conflict(error.message); } else if (error instanceof ApplicationError) { // Application-level catch-all (our custom base) logger.error("Application error", error); return internalError("An error occurred"); } else { // Unknown/unexpected errors logger.error("Unexpected error", error); reportToMonitoring(error); return internalError("Unexpected error"); } }72:T4f2,// JavaScript/TypeScript has a minimal built-in hierarchy // The built-in Error class and its subtypes: class Error { name: string; message: string; stack?: string; } class TypeError extends Error {} // Type-related errors class ReferenceError extends Error {} // Undefined variable access class SyntaxError extends Error {} // Parsing errors class RangeError extends Error {} // Values out of range class URIError extends Error {} // URI encoding errors class EvalError extends Error {} // eval() errors (mostly unused) // IMPORTANT: JavaScript allows throwing ANYTHING throw "a string"; // Works but loses stack trace throw 42; // Works but provides no context throw { error: "bad" }; // Works but not instanceof Error throw new Error("proper"); // Best practice: always throw Error instances // TypeScript cannot track exception types at compile time // You must use runtime checks: try { riskyOperation(); } catch (error) { if (error instanceof TypeError) { // Handle type error } else if (error instanceof Error) { // Handle generic error } else { // Handle non-Error thrown values throw new Error(`Unknown error: ${String(error)}`); } }73:T92b,/** * Application base exception class. * * All application-specific exceptions should extend this class, * enabling unified handling, logging, and monitoring. */ public abstract class ApplicationException extends RuntimeException { private final String errorCode; private final Instant timestamp; private final Map context; protected ApplicationException(String message) { this(message, null, null, Collections.emptyMap()); } protected ApplicationException(String message, Throwable cause) { this(message, cause, null, Collections.emptyMap()); } protected ApplicationException( String message, Throwable cause, String errorCode, Map context) { super(message, cause); this.errorCode = errorCode; this.timestamp = Instant.now(); this.context = new HashMap<>(context); } /** * Machine-readable error code for programmatic handling. * Format: DOMAIN.CATEGORY.SPECIFIC (e.g., "USER.VALIDATION.EMAIL_INVALID") */ public String getErrorCode() { return errorCode; } /** * When the exception occurred. Useful for debugging and correlation. */ public Instant getTimestamp() { return timestamp; } /** * Additional structured data about the error context. * May include entity IDs, operation names, etc. */ public Map getContext() { return Collections.unmodifiableMap(context); } /** * Fluent method to add context without modifying constructors. */ public T withContext(String key, Object value) { this.context.put(key, value); @SuppressWarnings("unchecked") T self = (T) this; return self; } /** * HTTP status code suggestion for REST API boundaries. * Subclasses override to provide appropriate codes. */ public int suggestedHttpStatus() { return 500; // Internal Server Error by default } /** * Whether this exception represents a retriable condition. * Default false; transient failure subclasses override. */ public boolean isRetriable() { return false; } }74:T954,/** * Application base error class. * * All application-specific errors should extend this class, * enabling unified handling, logging, and monitoring. */ export abstract class ApplicationError extends Error { public readonly errorCode: string | undefined; public readonly timestamp: Date; public readonly context: Record; public readonly cause?: Error; constructor( message: string, options: { cause?: Error; errorCode?: string; context?: Record; } = {} ) { super(message); // Maintain proper prototype chain for instanceof checks Object.setPrototypeOf(this, new.target.prototype); // Set the name to the class name for better error messages this.name = this.constructor.name; this.cause = options.cause; this.errorCode = options.errorCode; this.timestamp = new Date(); this.context = { ...options.context }; // Capture stack trace, excluding constructor call if (Error.captureStackTrace) { Error.captureStackTrace(this, this.constructor); } } /** * Add context fluently without modifying constructor calls. */ withContext(key: string, value: unknown): this { this.context[key] = value; return this; } /** * HTTP status code suggestion for REST API boundaries. * Subclasses override to provide appropriate codes. */ get suggestedHttpStatus(): number { return 500; // Internal Server Error by default } /** * Whether this error represents a retriable condition. * Default false; transient failure subclasses override. */ get isRetriable(): boolean { return false; } /** * Serialization for logging and error responses. */ toJSON(): Record { return { name: this.name, message: this.message, errorCode: this.errorCode, timestamp: this.timestamp.toISOString(), context: this.context, stack: this.stack, cause: this.cause instanceof Error ? { name: this.cause.name, message: this.cause.message } : undefined, }; } }75:T7e7,""" Application base exception class. 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""" from datetime import datetime, timezone from typing import Any, Optional from dataclasses import dataclass, field class ApplicationError(Exception): """Base class for all application exceptions.""" def __init__( self, message: str, *, cause: Optional[Exception] = None, error_code: Optional[str] = None, context: Optional[dict[str, Any]] = None, ) -> None: super().__init__(message) self.message = message self.cause = cause self.error_code = error_code self.timestamp = datetime.now(timezone.utc) self.context: dict[str, Any] = context or {} # Chain the cause for proper exception chaining if cause: self.__cause__ = cause def with_context(self, key: str, value: Any) -> "ApplicationError": """Add context fluently without modifying constructor calls.""" self.context[key] = value return self @property def suggested_http_status(self) -> int: """HTTP status code suggestion for REST API boundaries.""" return 500 # Internal Server Error by default @property def is_retriable(self) -> bool: """Whether this error represents a retriable condition.""" return False def to_dict(self) -> dict[str, Any]: """Serialization for logging and error responses.""" return { "type": self.__class__.__name__, "message": self.message, "error_code": self.error_code, "timestamp": self.timestamp.isoformat(), "context": self.context, "cause": str(self.cause) if self.cause else None, } def __str__(self) -> str: if self.error_code: return f"[{self.error_code}] {self.message}" return self.message76:T9fc,// Repository Layer: Catches database exceptions, wraps in domain terms public class UserRepository { public User findById(UserId id) { try { return jdbcTemplate.queryForObject( "SELECT * FROM users WHERE id = ?", userRowMapper, id.value() ); } catch (EmptyResultDataAccessException e) { // Convert to domain exception - no chaining needed here throw new UserNotFoundException(id); } catch (DataAccessException e) { // Wrap infrastructure exception with cause chain throw new RepositoryException( "Failed to fetch user: " + id, e // ← Original exception preserved as cause ); } } } // Service Layer: Catches repository exceptions, wraps in service terms public class UserService { public UserDTO getUser(String userId) { try { User user = userRepository.findById(UserId.of(userId)); return userMapper.toDTO(user); } catch (UserNotFoundException e) { // Domain exception - rethrow as-is throw e; } catch (RepositoryException e) { // Wrap in service-level exception throw new UserServiceException( "Failed to retrieve user profile", e // ← RepositoryException (with its SQLException cause) preserved ); } } } // Controller Layer: Logs full chain, returns clean response @RestController public class UserController { @GetMapping("/users/{id}") public ResponseEntity getUser(@PathVariable String id) { try { UserDTO user = userService.getUser(id); return ResponseEntity.ok(user); } catch (UserNotFoundException e) { return ResponseEntity.notFound().build(); } catch (UserServiceException e) { // Log the FULL exception chain for debugging log.error("Failed to get user", e); // Print cause chain: // UserServiceException → RepositoryException → SQLException → SocketException Throwable cause = e; while (cause != null) { log.debug("Caused by: {}", cause.getClass().getName()); cause = cause.getCause(); } return ResponseEntity.internalServerError().build(); } } }77:Ta48,// Repository Layer: Catches database errors, wraps in domain terms class UserRepository { async findById(id: UserId): Promise { try { const result = await this.db.query( 'SELECT * FROM users WHERE id = ?', [id.value] ); if (!result.rows[0]) { throw new UserNotFoundError(id); } return this.mapToUser(result.rows[0]); } catch (error) { if (error instanceof UserNotFoundError) { throw error; // Rethrow domain exceptions } // Wrap infrastructure errors with cause chain throw new RepositoryError( `Failed to fetch user: ${id.value}`, { cause: error as Error } // ← Original error preserved ); } } } // Service Layer: Catches repository errors, wraps in service terms class UserService { async getUser(userId: string): Promise { try { const user = await this.userRepository.findById(UserId.of(userId)); return this.userMapper.toDTO(user); } catch (error) { if (error instanceof UserNotFoundError) { throw error; // Domain error - rethrow as-is } // Wrap in service-level error throw new UserServiceError( 'Failed to retrieve user profile', { cause: error as Error } // ← RepositoryError chain preserved ); } } } // Controller Layer: Logs full chain, returns clean response class UserController { async getUser(req: Request, res: Response): Promise { try { const user = await this.userService.getUser(req.params.id); res.json(user); } catch (error) { if (error instanceof UserNotFoundError) { res.status(404).json({ error: 'User not found' }); return; } // Log the FULL error chain for debugging this.logger.error('Failed to get user', error); // Walk cause chain for detailed logging let cause: Error | undefined = error as Error; while 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TechnicalException extends ApplicationException { protected TechnicalException(String message, Throwable cause) { super(message, cause); } protected TechnicalException(String message, Throwable cause, String errorCode) { super(message, cause, errorCode, Collections.emptyMap()); } @Override public int suggestedHttpStatus() { return 503; // Service Unavailable by default } @Override public boolean isRetriable() { return true; // Technical failures are often transient } } /** * Security-related exceptions. * Authentication and authorization failures. */ public abstract class SecurityException extends ApplicationException { protected SecurityException(String message) { super(message); } @Override public int suggestedHttpStatus() { return 403; // Forbidden by default } } // Example: Now specific exceptions extend these bases public class InsufficientFundsException extends BusinessException { private final Money requested; private final Money available; public 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Design (LLD)","topic":"Exception Hierarchy Design","title":"Exception Hierarchy Design","description":"Master the art of designing robust exception hierarchies that enable precise error handling, clear error communication, and maintainable error management across large-scale systems. Learn to structure exceptions for clarity, extensibility, and operational excellence.","difficulty":"INTERMEDIATE","estimatedMinutes":60,"pages":[{"id":"seed_7d8e2feea1d9f864b35c801f60691f23","title":"Base Exception Classes","order":0,"content":[{"id":"opening-hook","title":"The Foundation of Error Communication","content":[{"data":{"content":"Every robust software system must communicate failure. When a database connection drops, when input validation fails, when business rules are violated—the system must signal these conditions in ways that callers can understand, handle, and recover from. At the heart of this communication lies a surprisingly nuanced question: **How should we structure the types that represent failures?**\n\nThe answer to this question shapes everything downstream: how callers catch and handle errors, how errors propagate across module boundaries, how teams reason about failure modes, and ultimately, how reliable and maintainable your system becomes.\n\nThis page examines the **base exception classes** that form the foundation of exception hierarchies—the root types from which all other exceptions derive. Understanding these foundations is essential before you can design effective custom exception hierarchies for your own systems."},"type":"text"},{"data":{"icon":"Target","title":"What You Will Learn","content":"By completing this page, you will understand: (1) how major languages structure their base exception classes and why, (2) the semantic differences between exception categories at the root level, (3) how to leverage base class hierarchies for effective error handling, and (4) the design principles that guide robust exception hierarchy architecture.","variant":"info"},"type":"callout"}]},{"id":"concept-exception-hierarchies","title":"The Concept of Exception Hierarchies","content":[{"data":{"content":"In object-oriented programming, exceptions are represented as objects—instances of classes that carry information about what went wrong. These classes don't exist in isolation; they're organized into **hierarchies** where more specific exception types inherit from more general ones.\n\nThis hierarchical structure serves a fundamental purpose: **it enables catch blocks to operate at different levels of specificity**. You can catch a very specific exception type when you know exactly how to handle it, or catch a broader base type when you want to handle an entire category of failures uniformly."},"type":"text"},{"data":{"fileName":"Hierarchy Catching Semantics","languages":[{"code":"// Exception hierarchy enables different handling granularities\n\ntry {\n processUserRequest(request);\n} catch (UserNotFoundException e) {\n // Very specific: handle this particular failure mode\n return notFound(\"User not found: \" + e.getUserId());\n \n} catch (ValidationException e) {\n // Medium specificity: any validation failure\n return badRequest(e.getValidationErrors());\n \n} catch (BusinessException e) {\n // Broader category: any business rule violation\n log.warn(\"Business rule violated\", e);\n return conflict(e.getMessage());\n \n} catch (ApplicationException e) {\n // Application-level catch-all (our custom base)\n log.error(\"Application error\", e);\n return internalError(\"An error occurred\");\n \n} catch (RuntimeException e) {\n // Language runtime exceptions\n log.error(\"Unexpected runtime error\", e);\n reportToMonitoring(e);\n return internalError(\"Unexpected error\");\n}","label":"Java","value":"java"},{"code":"$71","label":"TypeScript","value":"typescript"},{"code":"# Python exception hierarchy with custom base classes\n\ntry:\n process_user_request(request)\n \nexcept UserNotFoundException as e:\n # Very specific: handle this particular failure mode\n return not_found(f\"User not found: {e.user_id}\")\n \nexcept ValidationError as e:\n # Medium specificity: any validation failure\n return bad_request(e.validation_errors)\n \nexcept BusinessError as e:\n # Broader category: any business rule violation\n logger.warning(\"Business rule violated\", exc_info=e)\n return conflict(str(e))\n \nexcept ApplicationError as e:\n # Application-level catch-all (our custom base)\n logger.error(\"Application error\", exc_info=e)\n return internal_error(\"An error occurred\")\n \nexcept Exception as e:\n # Unknown/unexpected errors\n logger.error(\"Unexpected error\", exc_info=e)\n report_to_monitoring(e)\n return internal_error(\"Unexpected error\")","label":"Python","value":"python"}]},"type":"code"},{"data":{"content":"**The hierarchical structure provides three critical benefits:**\n\n1. **Precision when needed**: Catch specific types like `UserNotFoundException` when you have a specific recovery strategy\n\n2. **Categorization for common handling**: Catch intermediate types like `ValidationException` to handle all validation failures uniformly\n\n3. **Safety net for unanticipated failures**: Catch base types like `ApplicationException` to ensure nothing escapes without logging\n\nThis layered approach is only possible because exception classes inherit from base classes in a well-designed hierarchy."},"type":"text"}],"titleType":"number","titleNumber":1},{"id":"language-exception-hierarchies","title":"Language Exception Hierarchies","content":[{"data":{"content":"Before designing your own exception hierarchies, you must understand the base classes provided by your target language. Each language's exception system reflects different philosophies about error handling, and your custom exceptions must integrate properly with these foundations."},"type":"text"},{"data":{"content":"### Java Exception Hierarchy\n\nJava has one of the most carefully designed exception hierarchies, distinguishing between recoverable and unrecoverable conditions at the language level:"},"type":"text"},{"data":{"height":"450px","mermaidSyntax":"flowchart TD\n A[Throwable\nRoot of all errors] --> B[Error\nUnrecoverable conditions]\n A --> C[Exception\nRecoverable conditions]\n \n B --> D[OutOfMemoryError]\n B --> E[StackOverflowError]\n B --> F[VirtualMachineError]\n \n C --> G[RuntimeException\nUnchecked exceptions]\n C --> H[Checked Exceptions\nMust be declared/caught]\n \n G --> I[NullPointerException]\n G --> J[IllegalArgumentException]\n G --> K[IllegalStateException]\n G --> L[IndexOutOfBoundsException]\n \n H --> M[IOException]\n H --> N[SQLException]\n H --> O[InterruptedException]\n \n style A fill:#1e3a5f,stroke:#60a5fa,color:#fff\n style B fill:#7f1d1d,stroke:#f87171,color:#fff\n style C fill:#14532d,stroke:#4ade80,color:#fff\n style G fill:#713f12,stroke:#fbbf24,color:#fff\n style H fill:#312e81,stroke:#a78bfa,color:#fff"},"type":"mermaid-excalidraw"},{"data":{"rows":[["**Throwable**","Root of all throwable objects","Never extend directly; catch only in top-level handlers","N/A"],["**Error**","Serious problems that applications shouldn't try to handle","Never extend; never catch (usually)","No"],["**Exception**","Conditions that applications might want to catch","Extend for custom checked exceptions","Yes"],["**RuntimeException**","Exceptions that can be thrown during normal JVM operation","Extend for custom unchecked exceptions","No"]],"caption":"Java Exception Base Classes","headers":["Class","Purpose","When to Extend/Catch","Checked?"]},"type":"table"},{"data":{"icon":"Lightbulb","title":"Java's Checked vs Unchecked Philosophy","content":"Java forces you to declare or catch checked exceptions, making failure modes explicit in APIs. Unchecked exceptions (RuntimeException subclasses) represent programming errors or conditions that could happen almost anywhere. Most modern frameworks prefer unchecked exceptions for cleaner APIs, but checked exceptions remain valuable for critical operations where callers must acknowledge possible failures.","variant":"tip"},"type":"callout"},{"data":{"content":"### C# Exception Hierarchy\n\nC# takes a simpler approach than Java, with no distinction between checked and unchecked exceptions at the language level:"},"type":"text"},{"data":{"height":"380px","mermaidSyntax":"flowchart TD\n A[Exception\nBase for all exceptions] --> B[SystemException\nCLR/System failures]\n A --> C[ApplicationException\nApplication failures - Deprecated]\n \n B --> D[NullReferenceException]\n B --> E[ArgumentException]\n B --> F[InvalidOperationException]\n B --> G[IOException]\n B --> H[OutOfMemoryException]\n \n E --> I[ArgumentNullException]\n E --> J[ArgumentOutOfRangeException]\n \n style A fill:#1e3a5f,stroke:#60a5fa,color:#fff\n style B fill:#14532d,stroke:#4ade80,color:#fff\n style C fill:#7f1d1d,stroke:#f87171,color:#fff"},"type":"mermaid-excalidraw"},{"data":{"icon":"AlertCircle","title":"Avoid ApplicationException in C#","content":"Despite its appealing name, Microsoft recommends against deriving from ApplicationException. It was intended to distinguish application from system exceptions but provided no real benefit. Instead, derive custom exceptions directly from Exception or from more specific system exceptions when appropriate.","variant":"warning"},"type":"callout"},{"data":{"content":"### Python Exception Hierarchy\n\nPython's exception hierarchy emphasizes simplicity and broad categorization:"},"type":"text"},{"data":{"height":"420px","mermaidSyntax":"flowchart TD\n A[BaseException\nRoot of all exceptions] --> B[SystemExit\nsys.exit calls]\n A --> C[KeyboardInterrupt\nCtrl+C pressed]\n A --> D[GeneratorExit\nGenerator closed]\n A --> E[Exception\nAll regular exceptions]\n \n E --> F[ArithmeticError]\n E --> G[LookupError]\n E --> H[ValueError]\n E --> I[TypeError]\n E --> J[OSError]\n \n F --> K[ZeroDivisionError]\n G --> L[KeyError]\n G --> M[IndexError]\n J --> N[FileNotFoundError]\n J --> O[PermissionError]\n \n style A fill:#1e3a5f,stroke:#60a5fa,color:#fff\n style E fill:#14532d,stroke:#4ade80,color:#fff"},"type":"mermaid-excalidraw"},{"data":{"content":"Python's key design decision: **BaseException** exists separately from **Exception** to allow certain exceptions (like `KeyboardInterrupt` and `SystemExit`) to escape `except Exception` blocks. This lets users interrupt programs even when there's a broad exception handler.\n\n**Best practice**: Always catch `Exception` rather than `BaseException` unless you specifically need to intercept system-level signals."},"type":"text"},{"data":{"content":"### TypeScript/JavaScript Exception Model\n\nJavaScript and TypeScript have a fundamentally different approach—anything can be thrown, and there's no compile-time exception tracking:"},"type":"text"},{"data":{"fileName":"JavaScript/TypeScript Error Model","languages":[{"code":"$72","label":"TypeScript","value":"typescript"}]},"type":"code"},{"data":{"icon":"Info","title":"TypeScript Exception Design","content":"Since TypeScript can't track exception types statically, well-designed exception hierarchies become even more important. They provide the runtime type information needed for proper error handling. Always extend Error, never throw raw strings or objects, and establish clear hierarchy conventions for your project.","variant":"note"},"type":"callout"}],"titleType":"number","titleNumber":2},{"id":"anatomy-base-exception","title":"Anatomy of a Base Exception Class","content":[{"data":{"content":"Regardless of language, effective base exception classes share common characteristics. Understanding these elements helps you design your own application-specific base classes that integrate cleanly with the language's exception system."},"type":"text"},{"data":{"items":["**Message** — Human-readable description of what went wrong. Should be detailed enough for debugging but not expose sensitive information.","**Stack Trace** — The call chain that led to the exception. Essential for debugging; automatically captured in most languages.","**Cause/Inner Exception** — Reference to an underlying exception that triggered this one. Enables exception chaining without losing original context.","**Type Identity** — The class itself serves as a semantic tag. Catching proceeds by matching exception types, so the type hierarchy IS the API.","**Additional Context** — Language-specific fields like error codes, timestamps, correlation IDs, or domain-specific data."],"title":{"icon":"Target","text":"Essential Components of Base Exception Classes","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"fileName":"Base Exception Implementation Patterns","languages":[{"code":"$73","label":"Java","value":"java"},{"code":"$74","label":"TypeScript","value":"typescript"},{"code":"$75","label":"Python","value":"python"}]},"type":"code"},{"data":{"icon":"Lightbulb","title":"Design for Operability","content":"Notice how these base classes include fields like `errorCode`, `timestamp`, and `context`. These aren't just nice-to-haves—they're essential for production systems. Error codes enable monitoring dashboards, timestamps enable correlation, and context enables debugging. Build these capabilities into your base class so all exceptions automatically support production operations.","variant":"tip"},"type":"callout"}],"titleType":"number","titleNumber":3},{"id":"exception-chaining-wrapping","title":"Exception Chaining and Wrapping","content":[{"data":{"content":"One of the most critical features of base exception classes is **exception chaining**—the ability to wrap a lower-level exception within a higher-level one while preserving the original error information. This mechanism is fundamental to layered architectures where exceptions must cross abstraction boundaries."},"type":"text"},{"data":{"content":"### Why Exception Chaining Matters\n\nConsider a typical layered application: a controller calls a service, which calls a repository, which uses a database driver. When the database connection fails, you don't want the controller to catch `SQLException`—that would leak implementation details. But you also don't want to lose the root cause information.\n\n**Exception chaining solves this**: each layer catches exceptions from below and wraps them in domain-appropriate exceptions, while preserving the original as the 'cause'."},"type":"text"},{"data":{"height":"400px","mermaidSyntax":"flowchart TB\n subgraph \"Exception Propagation with Chaining\"\n A[Database Driver] -->|throws SQLException| B[Repository Layer]\n B -->|wraps as DataAccessException| C[Service Layer]\n C -->|wraps as ServiceException| D[Controller Layer]\n D -->|returns error response| E[Client]\n end\n \n subgraph \"Preserved Chain\"\n F[ServiceException] -->|cause| G[DataAccessException]\n G -->|cause| H[SQLException]\n H -->|cause| I[SocketException]\n end\n \n style A fill:#7f1d1d,stroke:#f87171,color:#fff\n style F fill:#1e3a5f,stroke:#60a5fa,color:#fff\n style G fill:#14532d,stroke:#4ade80,color:#fff\n style H fill:#713f12,stroke:#fbbf24,color:#fff\n style I fill:#581c87,stroke:#c084fc,color:#fff"},"type":"mermaid-excalidraw"},{"data":{"fileName":"Exception Chaining in Practice","languages":[{"code":"$76","label":"Java","value":"java"},{"code":"$77","label":"TypeScript","value":"typescript"}]},"type":"code"},{"data":{"items":["**Always preserve the cause** — When wrapping exceptions, pass the original as the cause. Never swallow the root exception.","**Chain at abstraction boundaries** — Wrap when crossing from infrastructure to domain, from domain to application, etc.","**Use appropriate abstraction level** — The wrapped exception should make sense at its layer. Don't expose `SQLException` from a service.","**Log the full chain once** — At the top-level handler, log the complete chain. Don't log at every layer.","**Include root cause in operational context** — Error monitoring should capture the original exception type, not just the wrapper."],"title":{"icon":"CheckCircle","text":"Exception Chaining Best Practices","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"}],"titleType":"number","titleNumber":4},{"id":"designing-application-base-class","title":"Designing Your Application Base Class","content":[{"data":{"content":"Most non-trivial applications benefit from a custom base exception class that sits between the language's built-in exceptions and your specific domain exceptions. This application base class provides:\n\n1. **Consistent structure** across all application exceptions\n2. **Built-in operational support** (error codes, context, serialization)\n3. **API boundary hints** (HTTP status suggestions, retriability)\n4. **A single interception point** for cross-cutting concerns"},"type":"text"},{"data":{"content":"### Hierarchy Design Decisions\n\nWhen designing your application's base exception class, you'll face several key decisions:"},"type":"text"},{"data":{"rows":[["**Abstract vs Concrete**","Abstract base (can't instantiate directly)","Concrete base (can throw directly)","**Abstract** — Forces creation of specific types, improves categorization"],["**Checked vs Unchecked (Java)**","Extend Exception (checked)","Extend RuntimeException (unchecked)","**Unchecked** — Cleaner APIs, but consider checked for critical operations"],["**Sealed vs Open (C#)**","Sealed hierarchy (no external extension)","Open hierarchy (anyone can extend)","**Open** — Allow modules to define their own exceptions"],["**Error codes required?**","Mandatory error code in constructor","Optional error code (nullable)","**Required** — Ensures consistent operational data"],["**Mutable context?**","Immutable context (set at creation)","Mutable context (add during propagation)","**Mutable** — Allows enrichment as exception propagates up"]],"caption":"Application Base Class Design Decisions","headers":["Decision","Option A","Option B","Recommendation"]},"type":"table"},{"data":{"fileName":"Complete Application Exception Hierarchy","languages":[{"code":"$78","label":"Java","value":"java"}]},"type":"code"},{"data":{"height":"450px","mermaidSyntax":"flowchart TD\n A[ApplicationException\nAbstract, adds error code, context, HTTP hints] --> B[BusinessException\nDomain rule violations\nHTTP 4xx]\n A --> C[TechnicalException\nInfrastructure failures\nHTTP 5xx, retriable]\n A --> D[SecurityException\nAuth failures\nHTTP 401/403]\n \n B --> E[ValidationException]\n B --> F[EntityNotFoundException]\n B --> G[InsufficientFundsException]\n B --> H[BusinessRuleViolation]\n \n C --> I[DatabaseException]\n C --> J[ExternalServiceException]\n C --> K[MessagingException]\n \n D --> L[AuthenticationException]\n D --> M[AuthorizationException]\n D --> N[TokenExpiredException]\n \n style A fill:#1e3a5f,stroke:#60a5fa,color:#fff\n style B fill:#14532d,stroke:#4ade80,color:#fff\n style C fill:#713f12,stroke:#fbbf24,color:#fff\n style D fill:#7f1d1d,stroke:#f87171,color:#fff"},"type":"mermaid-excalidraw"}],"titleType":"number","titleNumber":5},{"id":"anti-patterns","title":"Anti-Patterns to Avoid","content":[{"data":{"content":"Understanding what NOT to do is just as important as understanding best practices. Here are common anti-patterns in base exception class design:"},"type":"text"},{"data":{"left":[{"data":{"items":["**One generic exception for everything** — Using a single `ApplicationException` with a type field instead of separate classes","**Skipping the hierarchy** — Every exception extends directly from `Exception` with no intermediate organization","**Losing the cause** — Catching, logging, and rethrowing without preserving the original exception","**Over-engineering** — 10+ levels of exception hierarchy, complex generics, excessive abstraction","**Exposing implementation** — Letting `SQLException` escape from the data layer"],"title":{"icon":"XCircle","text":"Anti-Patterns","type":"icon","color":"destructive","variant":"outline-circle"},"variant":"glass"},"type":"list"}],"right":[{"data":{"items":["**Semantic exception types** — Each exception class represents a specific failure mode","**Organized hierarchy** — 2-3 levels of categorization (Application → Category → Specific)","**Complete cause chains** — Every wrapped exception includes `cause` pointing to original","**Pragmatic depth** — Hierarchy serves catching needs, no deeper","**Layer-appropriate exceptions** — Each layer throws exceptions at its abstraction level"],"title":{"icon":"CheckCircle","text":"Correct Patterns","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"}]},"type":"two-column"},{"data":{"fileName":"Anti-Pattern Examples","languages":[{"code":"$79","label":"Java","value":"java"}]},"type":"code"}],"titleType":"number","titleNumber":6},{"id":"summary-key-takeaways","title":"Summary: Base Exception Classes","content":[{"data":{"content":"Base exception classes form the foundation of your application's error handling architecture. Getting them right enables precise catching, clean abstraction boundaries, and effective operational support."},"type":"text"},{"data":{"type":"ordered","items":["**Exception hierarchies enable multi-level catching** — Catch specific types when you can handle them, broader types as safety nets.","**Know your language's base classes** — Java's `RuntimeException` vs `Exception`, Python's `Exception` vs `BaseException`, TypeScript's `Error` class.","**Design a rich base class** — Include error codes, timestamps, context maps, HTTP hints, and retriability flags.","**Use exception chaining religiously** — Always preserve causes when wrapping. The original exception is essential for debugging.","**Create intermediate categories** — `BusinessException`, `TechnicalException`, `SecurityException` provide useful grouping.","**Avoid anti-patterns** — Don't use a single exception with type enum. Don't create overly deep hierarchies. Don't lose causes."],"title":{"icon":"CheckCircle","text":"Key Takeaways","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"content":"**What's next:**\n\nWith a solid understanding of base exception classes, we'll move to **Custom Exception Classes**—how to design specific exceptions for your domain, what information they should carry, and how to make them useful for both error handling and debugging."},"type":"text"},{"data":{"icon":"CheckCircle","title":"Page Complete","content":"You now understand the role of base exception classes in exception hierarchies, how major languages structure their built-in hierarchies, and how to design your own application base class. 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