NullReferenceException, seems to be storing no value for bool?

[jimmycartrette]

I'm just getting started with plugging FusionCache to replace our existing cache systems. I'm calling this: _cache.Set(GetKeyName(key), obj, expiresIn); With obj being a bool. When it's brought back: var maybeValue = _cache.TryGet(GetKeyName(key)); Of type bool, I get a nullreferenceexception.

System.Exception: Error in Evaluate_ExpiredSecretPasswordChangeMessage: System.NullReferenceException: Object reference not set to an instance of an object.
   at ZiggyCreatures.Caching.Fusion.Internals.Memory.FusionCacheMemoryEntry`1.GetValue[TValue1]() in D:\repos\FusionCache\src\ZiggyCreatures.FusionCache\Internals\Memory\FusionCacheMemoryEntry.cs:line 66
   at ZiggyCreatures.Caching.Fusion.FusionCache.GetValueFromMemoryEntry[TValue](String operationId, String key, IFusionCacheMemoryEntry entry, FusionCacheEntryOptions options) in D:\repos\FusionCache\src\ZiggyCreatures.FusionCache\FusionCache.cs:line 967
   at ZiggyCreatures.Caching.Fusion.FusionCache.TryGet[TValue](String key, FusionCacheEntryOptions options, CancellationToken token) in D:\repos\FusionCache\src\ZiggyCreatures.FusionCache\FusionCache_Sync.cs:line 565

Trying to dig into the cache itself, it has no "v" or value:

hgetall v0:Fusion:fe08c382-ef5d-4fce-87f5-670b32d0770a:SecretMessage_Enabled 1) "absexp" 2) "638656609480003673" 3) "data" 4) "{\"m\":{\"e\":\"2024-10-27T21:22:28.0003673+00:00\"},\"t\":638656573480003673}" 5) "sldexp" 6) "-1"

A good entry looks like this: 1) "absexp" 2) "638656608619653733" 3) "data" 4) "{\"v\":true,\"m\":{\"e\":\"2024-10-27T21:21:01.9653733+00:00\"},\"t\":638656572619653733}" 5) "sldexp" 6) "-1"

Any idea what could be going wrong? Using newtonsoft serializer, redis backplane/L2

[jimmycartrette]

I think the default JsonSerializerSettings needs DefaultValueHandling to be set:

                var serializer = new FusionCacheNewtonsoftJsonSerializer(new JsonSerializerSettings()
                {
                    TypeNameHandling = TypeNameHandling.Auto,
                    DefaultValueHandling = DefaultValueHandling.Include
                });

[jodydonetti]

Hi @jimmycartrette , yes I was about to suggest looking into the configuration of the specific serializer. Glad it now works.

Just to be clear, regarding the code above which one is:

• var maybeValue = _cache.TryGet<bool>(GetKeyName(key)); -> bool
• var maybeValue = _cache.TryGet<bool?>(GetKeyName(key)); -> bool?

I want to doublecheck something...

[jimmycartrette]

The first one, not a nullable value type

[jodydonetti]

What I thought: I don't if this is exactly the case, but in general if you try do deserialize null into a bool you will have an exception.