Spring Cloud Gateway Circuit Breaker

In this tutorial, you'll learn about Fix Spring Cloud Gateway Circuit Breaker Not Opening. We cover key concepts, practical examples, and best practices.

The Problem

The circuit breaker never opens despite repeated failures downstream.

Quick Fix

Add circuit breaker filter

Wrong:

# No CircuitBreaker filter

Output:

No circuit breaker

Right:

spring.cloud.gateway.routes[0].filters[0]=CircuitBreaker=myCircuitBreaker

Output:

Circuit breaker configured

Configure fallback URI

Wrong:

filters[0].args.fallbackUri=forward:/fallback

Output:

No fallback when open

Right:

filters[0].args.fallbackUri=forward:/fallback

Output:

Fallback endpoint configured

Prevention

• Add the CircuitBreaker filter to the route
• Configure fallbackUri for degraded responses
• Set proper timeout and failure rate threshold

Common Mistakes with cloud gateway circuit breaker

1. Misunderstanding that String is [Char] with poor performance for large text operations
2. Using foldl instead of foldl' causing stack overflow on large lists
3. Forgetting deriving (Show, Eq) on custom data types needed for debugging

These mistakes appear frequently in real-world SPRING code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ

This quick fix is part of the DodaTech Spring & JVM ecosystem series. Built by the developers of Doda Browser, DodaZIP, and Durga Antivirus Pro.