Caffeine: How can we restrict 'Null' values to add into cache?

[ankit8051]

Hi Team,

How can we restrict 'Null' values to add into cache?
Because I have one use case that if the value is null then we have to grab the data, not from the cache.

Thanks in advance.

[ben-manes]

The cache does not allow storing null values. If you perform a computation and return null then this indicates the data doesn't exist and the caller receives null. So for example cache.get(key, function) or CacheLoader#load behave similar to ConcurrentHashMap#computeIfAbsent. An explicit put(key, null) is not allowed and will throw an exception.

Does that resolve your scenario?

[ankit8051]

Thanks, Ben,

Thanks for your quick reply.

You are right. Cache is not allowing the null values.

Actually, I was storing java.util.Optional so that's why I was not getting an exception.

[ben-manes]

Optional is a good technique for negative caching.

Can you clarify if you have an open question? I'm unsure how to proceed.

[ankit8051]

My question is resolved now.

Closing this question.