👀 Views: 3 💬 Answers: 1 📅 Created: 2025-06-09

java spring-webflux redis reactive-programming Java

I've tried everything I can think of but I'm working on a personal project and This might be a silly question, but I'm working on a Spring WebFlux application that uses Redis as a cache layer, but I'm running into issues when trying to implement reactive streams for data retrieval. I have a service that fetches data from a Redis repository, and I expected the returned `Mono<T>` to emit values reactively. However, when I call the method, it seems to block the thread instead of being non-blocking. Here’s a simplified version of my code: ```java @Service public class MyService { private final ReactiveRedisTemplate<String, MyEntity> redisTemplate; public MyService(ReactiveRedisTemplate<String, MyEntity> redisTemplate) { this.redisTemplate = redisTemplate; } public Mono<MyEntity> getMyEntity(String id) { return redisTemplate.opsForValue().get(id); } } ``` When I call `getMyEntity(id)` from my controller, it seems to block instead of returning immediately: ```java @RestController public class MyController { private final MyService myService; public MyController(MyService myService) { this.myService = myService; } @GetMapping("/entity/{id}") public Mono<MyEntity> fetchEntity(@PathVariable String id) { return myService.getMyEntity(id); } } ``` Despite using `Mono`, I see a warning in my logs: `Publisher failed with a blocking call`. I’ve ensured that I’m using the appropriate versions of Spring Boot (2.6.4) and Spring Data Redis (2.6.4) to support reactive programming. I've also verified that Redis is running in the right mode and is accessible. I tried adding `@EnableReactiveRedisRepositories` to my configuration, but that didn’t resolve the scenario. The Redis connection factory is properly set up as a `ReactiveRedisConnectionFactory`. Could this be related to how I am trying to read data from Redis? Any insights or suggestions on how to properly implement this in a reactive manner would be greatly appreciated. I'm looking for best practices to ensure that my application remains non-blocking while utilizing Redis as a cache. This is part of a larger application I'm building. For context: I'm using Java on Debian. Any pointers in the right direction? This issue appeared after updating to Java 3.10. Cheers for any assistance! I've been using Java for about a year now. What's the correct way to implement this?