Spring @Cacheable with complex keys still executed

Question

I have the following for the usage of a @Cacheable in spring (3.1):

spring:

Answer 1

In my case, the problem was caused by using the wrong configuration of the cache provider (Caffeine):

@Bean
public Caffeine caffeineCacheBuilder() {
    return Caffeine.newBuilder()
        .initialCapacity(100)
        .maximumSize(1000)
        .expireAfterAccess(10, TimeUnit.MINUTES)
        .weakKeys(); // cause problems when concatenated keys used
}

As the docs says, weakKeys() method:

Specifies that each key (not value) stored in the cache should be wrapped in a WeakReference (by default, strong references are used).

Warning: when this method is used, the resulting cache will use identity ({@code ==}) comparison to determine equality of keys. Its {@link Cache#asMap} view will therefore technically violate the {@link Map} specification (in the same way that {@link IdentityHashMap} does).