spring - How to make @Cacheable return null when not found in cache but do not cache the result? - Stack Overflow

spring - How to make @Cacheable return null when not found in cache but do not cache the result? - Stack Overflow

Here is what I ended up with, trick was to use 'unless' to our advantage

@Cacheable(value="books", key="#isbn", unless = "#result == null")  public Book findBookFromCache(ISBN isbn, boolean checkWarehouse, boolean includeUsed)  {      return null;  }

this method

• Looks up in the cache based on key
• if found return the result from cache
• if not found evaluates method that return null
• return value is matched with unless condition (which always return true)
• null value do not get cached
• null value is returned to caller

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