Скачать или смотреть Why is Redis Cache Not Empty in Your Spring Boot Application? Here’s How to Fix It!

Learn why your Redis Cache may not be clearing in your Spring Boot app and discover effective solutions to ensure your data stays fresh and relevant.
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Why is Redis Cache Not Empty in Your Spring Boot Application? Here’s How to Fix It!

Using Redis Cache in a Spring Boot application can greatly enhance the performance of your API calls by storing data temporarily. However, there may be times when you encounter issues, such as the cache not getting cleared, leading to stale data being presented to users. If you've found yourself asking, "Why is my Redis Cache not getting empty?", you're not alone. In this guide, we will break down the problem and provide actionable solutions.

The Problem: Stale Data in Redis Cache

You may have set up your Spring Boot application to regularly clear Redis cache using scheduled tasks, but if the cache still shows outdated data, it can be frustrating. The source code you've provided shows that you are using both @ Scheduled tasks and @ CacheEvict annotations, among other configurations. The key questions are:

Is everything configured correctly?

Why is the cache not being cleared as expected?

Key Variables in Your Code

You provided two main pieces of code for analysis:

Cache Eviction Method

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Cache Configuration

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Solutions to Clear Redis Cache Effectively

To ensure your Redis Cache gets cleared as intended, follow these steps:

Step 1: Enable Caching

Ensure that you have the @ EnableCaching annotation in your Spring Boot application's configuration file. This annotation is essential for enabling cache management capabilities and it might be the missing link in your case.

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Step 2: Use Either @ CacheEvict or Manual Clearing

Using both @ CacheEvict and calling clear() on the cache manager in the same method can result in confusion. They both aim to clear the cache, and using them together can sometimes nullify the intended effect. Choose one method to achieve your goal effectively:

Using @ CacheEvict alone:

Remove the call to redisCacheMngr.getCache("redis-cache").clear();. The @ CacheEvict annotation will take care of clearing entries based on your settings.

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Using Manual Clearing alone:

If you prefer to manage cache entries manually, you can skip the @ CacheEvict and call clear() directly, which provides more control.

Final Thoughts

With these simple adjustments, you should find that your Redis Cache is properly clearing, providing up-to-date data for your Spring Boot application’s API. Remember, caching is a powerful tool, but it must be managed correctly to be effective. By ensuring that caching is enabled and simplifying your cache clearing methods, you can eliminate stale data issues and enhance user experience.

If you still encounter difficulties, don't hesitate to revisit your logs or seek community support. Happy coding!