[FIXED] Using Spring Cache with Hazelcast Near Cache

Issue

I'm trying to configure Spring CacheManager with Hazelcast. Also, I want to configure Hazelcast's Near Cache so I can retrieve the (already deserialized) instance of my cached object.

Here is my configuration

    @Bean
    public HazelcastInstance hazelcastConfig() {
        val config = new Config().setInstanceName("instance");
        val serializationConfig = config.getSerializationConfig();
        addCacheConfig(config, "USERS")
        serializationConfig.addSerializerConfig(new SerializerConfig()
                        .setImplementation(getSerializer())
                        .setTypeClass(User.class)
        return Hazelcast.newHazelcastInstance(config);
    }

    @Bean
    public CacheManager cacheManager(HazelcastInstance hazelcastInstance) {
        return new HazelcastCacheManager(hazelcastInstance);
    }

    @Bean
    public PlatformTransactionManager chainedTransactionManager(PlatformTransactionManager jpaTransactionManager, HazelcastInstance hazelcastInstance) {
        return new ChainedTransactionManager(
                jpaTransactionManager,
                new HazelcastTransactionManager(hazelcastInstance)
        );
    }

    // Configure Near Cache
    private void addCacheConfig(Config config, String cacheName) {
        val nearCacheConfig = new NearCacheConfig()
                .setInMemoryFormat(OBJECT)
                .setCacheLocalEntries(true)
                .setInvalidateOnChange(false)
                .setTimeToLiveSeconds(hazelcastProperties.getTimeToLiveSeconds())
                .setEvictionConfig(new EvictionConfig()
                        .setMaxSizePolicy(ENTRY_COUNT)
                        .setEvictionPolicy(EvictionPolicy.LRU)
                        .setSize(hazelcastProperties.getMaxEntriesSize()));
        config.getMapConfig(cacheName)
                .setInMemoryFormat(BINARY)
                .setNearCacheConfig(nearCacheConfig);
    }

Saving and retrieving from the Cache is working fine, but my object is deserialized every time I have a cache hit. I want to avoid this deserialization time using a NearCache, but it doesn´t work. I also tried BINARY memory format.

Is this possible with Hazelcast? Or is this deserialization always executed even if I have a NearCache?

Thanks

Solution

So after a few changes, it is working now. Here is my conclusion:

So in order to have NearCache working with Spring Cache, all your cached objects should be Immutable. This means final classes and final fields. Also, they all should extend the Serializable interface.

Answered By - jpadilladev
Answer Checked By - Senaida (JavaFixing Volunteer)