This closes #88 Fix jdk 1.7 build on MQTT
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@ -39,7 +39,7 @@ public class MQTTSessionState
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// Used to store Packet ID of Publish QoS1 and QoS2 message. See spec: 4.3.3 QoS 2: Exactly once delivery. Method B.
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private Map<Integer, MQTTMessageInfo> messageRefStore;
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private Map<String, Map<Long, Integer>> addressMessageMap;
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private ConcurrentHashMap<String, Map<Long, Integer>> addressMessageMap;
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private Set<Integer> pubRec;
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