How can you combine @Cacheable with a condition to cache only results where the returned value is not null?

hard📝 Application Q9 of 15

Spring Boot - Caching

How can you combine @Cacheable with a condition to cache only results where the returned value is not null?

A@Cacheable(cacheNames = "data", condition = "#result == null")

B@Cacheable(cacheNames = "data", condition = "#result != null")

C@Cacheable(cacheNames = "data", unless = "#result != null")

D@Cacheable(cacheNames = "data", unless = "#result == null")

Step-by-Step Solution

Solution:

Step 1: Understand unless and condition attributes
condition controls if caching happens before method call; unless prevents caching after method call based on result.
Step 2: Choose correct attribute to skip caching null results
To skip caching when result is null, use unless = "#result == null". @Cacheable(cacheNames = "data", unless = "#result == null") matches this. Others are incorrect logic.
Final Answer:
@Cacheable(cacheNames = "data", unless = "#result == null") -> Option D
Quick Check:
Use unless to skip caching null results [OK]

Quick Trick: Use unless to skip caching null results [OK]

Common Mistakes:

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