Spring Boot - Caching
You want to cache results of a method that returns a list of users filtered by role. How do you ensure caching works correctly for different roles?
You want to cache results of a method that returns a list of users filtered by role. How do you ensure caching works correctly for different roles?
hard📝 component behavior Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand caching by method parameters
To cache results differently based on the role parameter, specify a key using SpEL expression referencing the role.
Step 2: Evaluate options
Use
@Cacheable(cacheNames = "users", key = "#role")to cache by role parameter. correctly useskey = "#role"to cache by role. Use@Cacheable(cacheNames = "users")without key; caching will auto-differentiate. caches all calls under same key, causing wrong reuse. Use@Cacheable(cacheNames = "users", key = "#root.methodName")to cache by method name. caches by method name only, ignoring parameters. Caching cannot be used with methods returning lists. is false.Final Answer:
Use @Cacheable(cacheNames = "users", key = "#role") to cache by role parameter. -> Option BQuick Check:
Use key to cache by parameter [OK]
Quick Trick: Use key attribute to cache by specific parameter [OK]
Common Mistakes:
- Not specifying key for parameter-based caching
- Caching by method name only
- Thinking lists can't be cached
Master "Caching" in Spring Boot
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