Async caching using caffeine

Question

I came across asynchronous caching using Caffeine library. Following https://www.programcreek.com/java-api-examples/?api=com.github.benmanes.caffeine.cache.AsyncCacheLoader, I have following code snippet:

import com.github.benmanes.caffeine.cache.AsyncCacheLoader;
import com.github.benmanes.caffeine.cache.AsyncLoadingCache;
import com.github.benmanes.caffeine.cache.Cache;
import com.github.benmanes.caffeine.cache.Caffeine;
import com.github.benmanes.caffeine.cache.Weigher;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;

public class CacheManager {
private static AsyncLoadingCache<String, Object> loader;

public static void initLoadingCache(<datatype> obj) {
    if (loader == null) {
        loader = Caffeine.newBuilder()
                .concurrencyLevel(10)
                .expireAfterWrite(60, TimeUnit.MINUTES) // Cache will expire after 60 minutes
                .buildAsync(new AsyncCacheLoader<String, Object>() { // Build the CacheLoader
                    @Override
                    public CompletableFuture<Object> asyncLoad(String key, Executor executor) throws Exception{
                        Object temp = obj.getTemp(key); // my function which does processing
                        if (temp == null)  LOGGER.error("Not found");
                        return temp;
                    }
                });
        }
    }
}

public Object getTemp(String key) {
    Query query = somequery();
    List<Object> val = query.getResultList();
    return val.get(0);
}

1. It is obvious that the above code will have error as I am returning temp which is Object but the function is expecting CompletableFuture<Object>. How can I achieve this? I am guessing that getTemp() needs to return ListenableFuture<> as well (https://www.programcreek.com/java-api-examples/?code=Netflix%2Ftitus-control-plane%2Ftitus-control-plane-master%2Ftitus-supplementary-component%2Ftasks-publisher%2Fsrc%2Fmain%2Fjava%2Fcom%2Fnetflix%2Ftitus%2Fsupplementary%2Ftaskspublisher%2FTitusClientImpl.java) but I am not sure how can I achieve this since it has DB queries.