Spring Boot Error Handling Rules

Implement standardized error handling with custom exceptions and @ControllerAdvice in Spring Boot.

1|Updated Mar 16, 2026

Search Tags:#error handling #java #rest api #kotlin #exception handling #spring boot

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npx skills add https://github.com/iceflower/opencode-agents-and-skills --skill spring-boot-error-handling-rules

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Please help me install this Agent Skill.
Skill: Spring Boot Error Handling Rules
Source: https://github.com/iceflower/opencode-agents-and-skills/tree/main/skills/spring-error-handling
Command: npx skills add https://github.com/iceflower/opencode-agents-and-skills --skill spring-boot-error-handling-rules

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill provides a structured and consistent approach to handling errors and exceptions within Spring Boot applications, ensuring graceful failure and informative responses.

Core Features & Use Cases

Standardized Error Codes: Defines a clear enum for consistent error reporting.
Global Exception Handling: Implements a centralized @ControllerAdvice for managing exceptions.
Custom Business Exceptions: Facilitates the creation of domain-specific exceptions.
External API Error Management: Offers patterns for handling errors from external services.
Use Case: When a user attempts to create a resource with a name that already exists, the application should return a 409 Conflict with a specific error code and message, preventing duplicate entries.

Quick Start

Implement the provided GlobalExceptionHandler class in your Spring Boot application to centralize error management.

Frequently Asked Questions about Spring Boot Error Handling Rules

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I implement global exception handling in Spring Boot REST APIs?▼

Global exception handling in Spring Boot REST APIs is implemented using a centralized `@ControllerAdvice` class. This approach intercepts exceptions across the whole application, mapping custom business exceptions and error code enums to consistent HTTP responses like 409 Conflict for duplicate entities.

What is the best way to return standardized error codes for Spring Boot exceptions?▼

The best way to return standardized error codes for Spring Boot exceptions is by defining an error code enum. This enum pairs with custom business exceptions and a global exception handler to ensure consistent API error responses across scenarios like invalid input or entity not found.

Does this Spring Boot error handling pattern support external API failures?▼

Yes, this Spring Boot error handling pattern supports external API failures. It provides specific patterns for external API error management, allowing your application to gracefully handle and map service failures into standardized error responses via the global exception handler.

How do I handle duplicate entity creation in a Spring Boot application?▼

To handle duplicate entity creation in a Spring Boot application, you use custom business exceptions. When a user creates a resource with an existing name, the application catches the exception and returns a 409 Conflict status with a specific error code and message.

Can I use this exception handling approach with Kotlin Spring Boot applications?▼

Yes, you can use this exception handling approach with Kotlin Spring Boot applications. The pattern relies on standard framework features like `@ControllerAdvice` and custom exceptions, which are fully compatible with Kotlin for building robust REST APIs.

When do I need custom business exceptions in Spring Boot?▼

You need custom business exceptions in Spring Boot when handling domain-specific failures like entity not found, duplicate entity creation, or invalid input. They allow you to attach specific error codes and map them to appropriate HTTP statuses through centralized global exception handling.