commons-jcs3-core/src/main/java/org/apache/commons/jcs3/auxiliary/lateral/LateralCacheNoWait.java [200:220]:
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            return keys.stream()
                .collect(Collectors.toMap(
                        key -> key,
                        this::get)).entrySet().stream()
                    .filter(entry -> entry.getValue() != null)
                    .collect(Collectors.toMap(
                            Entry::getKey,
                            Entry::getValue));
        }

        return new HashMap<>();
    }

    /**
     * Synchronously reads from the lateral cache.
     * <p>
     * @param pattern
     * @return ICacheElement&lt;K, V&gt; if found, else empty
     */
    @Override
    public Map<K, ICacheElement<K, V>> getMatching(final String pattern)
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commons-jcs3-core/src/main/java/org/apache/commons/jcs3/auxiliary/lateral/LateralCacheNoWaitFacade.java [272:293]:
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            return keys.stream()
                .collect(Collectors.toMap(
                        key -> key,
                        this::get)).entrySet().stream()
                    .filter(entry -> entry.getValue() != null)
                    .collect(Collectors.toMap(
                            Entry::getKey,
                            Entry::getValue));
        }

        return new HashMap<>();
    }

    /**
     * Synchronously reads from the lateral cache. Get a response from each! This will be slow.
     * Merge them.
     * <p>
     * @param pattern
     * @return ICacheElement
     */
    @Override
    public Map<K, ICacheElement<K, V>> getMatching(final String pattern)
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