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

following @cacheable annotation

@cacheable(value="books", key="#isbn") public book findbook(isbn isbn, boolean checkwarehouse, boolean includeused) 

• looks in cache based on key
• if found return result cache
• if not found evaluates method
• updates cache
• return result

so next time method called same arguments fetched cache.

what want instead to

• look in cache based on key
• if found return result cache
• if not found return null

i don't want update cache in case of cache-miss, there way using spring annotation

here ended with, trick use 'unless' our advantage

@cacheable(value="books", key="#isbn", unless = "#result == null") public book findbookfromcache(isbn isbn, boolean checkwarehouse, boolean includeused) {     return null; } 

this method

• looks in cache based on key
• if found return result cache
• if not found evaluates method return null
• return value matched unless condition (which return true)
• null value not cached
• null value returned caller