diff --git a/broker/src/main/java/io/moquette/spi/impl/subscriptions/Subscription.java b/broker/src/main/java/io/moquette/spi/impl/subscriptions/Subscription.java
index 98c066c0..1dd9adec 100644
--- a/broker/src/main/java/io/moquette/spi/impl/subscriptions/Subscription.java
+++ b/broker/src/main/java/io/moquette/spi/impl/subscriptions/Subscription.java
@@ -13,28 +13,27 @@
  *
  * You may elect to redistribute this code under either of these licenses.
  */
+
 package io.moquette.spi.impl.subscriptions;
 
 import io.moquette.spi.ISessionsStore.ClientTopicCouple;
 import io.netty.handler.codec.mqtt.MqttQoS;
-
 import java.io.Serializable;
 
 /**
- * Maintain the information about which Topic a certain ClientID is subscribed 
- * and at which QoS
- * 
- * 
+ * Maintain the information about which Topic a certain ClientID is subscribed and at which QoS
+ *
+ *
  * @author andrea
  */
 public final class Subscription implements Serializable {
 
     private static final long serialVersionUID = -3383457629635732794L;
-    final MqttQoS requestedQos; //max QoS acceptable
+    final MqttQoS requestedQos; // max QoS acceptable
     final String clientId;
     final String topicFilter;
     final boolean active;
-    
+
     public Subscription(String clientId, String topicFilter, MqttQoS requestedQos) {
         this.requestedQos = requestedQos;
         this.clientId = clientId;
@@ -67,12 +66,15 @@ public final class Subscription implements Serializable {
 
     @Override
     public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
 
         Subscription that = (Subscription) o;
 
-        if (clientId != null ? !clientId.equals(that.clientId) : that.clientId != null) return false;
+        if (clientId != null ? !clientId.equals(that.clientId) : that.clientId != null)
+            return false;
         return !(topicFilter != null ? !topicFilter.equals(that.topicFilter) : that.topicFilter != null);
 
     }
@@ -86,8 +88,12 @@ public final class Subscription implements Serializable {
 
     @Override
     public String toString() {
-        return String.format("[filter:%s, cliID: %s, qos: %s, active: %s]", this.topicFilter, this.clientId,
-                this.requestedQos, this.active);
+        return String.format(
+                "[filter:%s, cliID: %s, qos: %s, active: %s]",
+                this.topicFilter,
+                this.clientId,
+                this.requestedQos,
+                this.active);
     }
 
     @Override