Spring Boot: ignore deserialization errors with Redis cache

To store java objects in Redis for caching with Srping Boot they need to implement Serializable and have serialVersionId. If you update the object and change its serialVersionId Spring will start throwing deserialization errors. You can clear the cache during deployment but that is not ideal as it presents additional steps especially if you are using CD/CI. The solution I used is to ignore the errors, Spring will act like there is no cache, and it will override the cache key. To configure it, you need to extend CachingConfigurerSupport and replace CacheErrorHandler with custom implementation:

@Configuration
@Slf4j
public class CacheConfiguration extends CachingConfigurerSupport {

    /**
     * ignore cache get errors
     */
    @Slf4j
    private static class RelaxedCacheErrorHandler extends SimpleCacheErrorHandler {
        @Override
        public void handleCacheGetError(RuntimeException exception, Cache cache, Object key) {
            log.warn("Deserialization error on {} cache. Refreshing", cache.getName());
        }
    }

    @Override
    public CacheErrorHandler errorHandler() {
        return new RelaxedCacheErrorHandler();
    }

}