Ehcache 3.3 with value as collection of object

[vaibhav srivastava]

1. What version of Ehcache you are currently using; 3.3
2. Paste the configuration for the Cache/CacheManager you have an issue with;

3. CacheManager cacheManager = CacheManagerBuilder.newCacheManagerBuilder().
           withCache("testCache", 
                       CacheConfigurationBuilder.newCacheConfigurationBuilder
                       (String.class,**customObject.class**,ResourcePoolsBuilder.heap(10))
                       .withExpiry(Expirations.timeToLiveExpiration(Duration.of(200, TimeUnit.SECONDS)))
                     ).build();

4. Add any name and version of other library or framework you use Ehcache with (e.g. Hibernate);
5. Providing JDK and OS versions maybe useful as well.

I want to replace that customobject.class with List<customObject>

How to initialize cache with value collection of custom object ?

Can we do it ?

[Louis Jacomet]

Hi,

Yes you can do it and it will work, but the type system will not help you ... and even stand in your way in places.

In short, you cannot express the class of List<CustomObject> so you have to create a String.class, List.class cache.

Then when getting the cache, you have to cast it from Cache<String, List> to Cache<String, List<CustomObject>>.

Also, whenever you cache a mutable object make sure to understand that mutating it will be reflected in the cache unless you use copiers or move beyond heap.

Regards,

Louis

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