commons-jcs3-core/src/main/java/org/apache/commons/jcs3/auxiliary/AbstractAuxiliaryCache.java [60:89]:
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        if (keys != null)
        {
            return keys.stream()
                .map(key -> {
                    try
                    {
                        return get(key);
                    }
                    catch (final IOException e)
                    {
                        return null;
                    }
                })
                .filter(Objects::nonNull)
                .collect(Collectors.toMap(
                        ICacheElement::getKey,
                        element -> element));
        }

        return new HashMap<>();
    }

    /**
     * Gets the item from the cache.
     *
     * @param key
     * @return ICacheElement, a wrapper around the key, value, and attributes
     * @throws IOException
     */
    @Override
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commons-jcs3-core/src/main/java/org/apache/commons/jcs3/engine/memory/AbstractMemoryCache.java [120:150]:
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        if (keys != null)
        {
            return keys.stream()
                .map(key -> {
                    try
                    {
                        return get(key);
                    }
                    catch (final IOException e)
                    {
                        return null;
                    }
                })
                .filter(Objects::nonNull)
                .collect(Collectors.toMap(
                        ICacheElement::getKey,
                        element -> element));
        }

        return new HashMap<>();
    }

    /**
     * Get an item from the cache without affecting its last access time or position. Not all memory
     * cache implementations can get quietly.
     * <p>
     * @param key Identifies item to find
     * @return Element matching key if found, or null
     * @throws IOException
     */
    @Override
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