Java Version set to 1.8

anonymous types replaced by lambda's
Method references used instead of Lambda's
Explicit type replaced by <>
travis.yml updated to java 1.8

broker/src/test/java/io/moquette/spi/impl/ProtocolProcessorTest.java

@@ -19,7 +19,6 @@ package io.moquette.spi.impl;
 import io.moquette.interception.InterceptHandler;
 import io.moquette.persistence.MemoryStorageService;
 import io.moquette.server.netty.NettyUtils;
-import io.moquette.spi.IMatchingCondition;
 import io.moquette.spi.IMessagesStore;
 import io.moquette.spi.IMessagesStore.StoredMessage;
 import io.moquette.spi.ISessionsStore;
@@ -417,12 +416,8 @@ public class ProtocolProcessorTest {
                 .payload(Unpooled.copiedBuffer("Hello".getBytes())).retained(true).messageId(100).build();
         m_processor.processPublish(m_channel, msg);
 
-        Collection<IMessagesStore.StoredMessage> messages = m_messagesStore.searchMatching(new IMatchingCondition() {
-
-            public boolean match(Topic key) {
-                return key.match(new Topic(FAKE_TOPIC));
-            }
-        });
+        Collection<IMessagesStore.StoredMessage> messages = m_messagesStore
+                .searchMatching(key -> key.match(new Topic(FAKE_TOPIC)));
         assertFalse(messages.isEmpty());
 
         // Exercise
@@ -432,12 +427,7 @@ public class ProtocolProcessorTest {
         m_processor.processPublish(m_channel, cleanPubMsg);
 
         // Verify
-        messages = m_messagesStore.searchMatching(new IMatchingCondition() {
-
-            public boolean match(Topic key) {
-                return key.match(new Topic(FAKE_TOPIC));
-            }
-        });
+        messages = m_messagesStore.searchMatching(key -> key.match(new Topic(FAKE_TOPIC)));
         assertTrue(messages.isEmpty());
     }
 

broker/src/test/java/io/moquette/testclient/Client.java

@@ -134,12 +134,9 @@ public class Client {
 
     private void doConnect(MqttConnectMessage connectMessage) {
         final CountDownLatch latch = new CountDownLatch(1);
-        this.setCallback(new Client.ICallback() {
-
-            public void call(MqttMessage msg) {
-                receivedMsg = msg;
-                latch.countDown();
-            }
+        this.setCallback(msg -> {
+            receivedMsg = msg;
+            latch.countDown();
         });
 
         this.sendMessage(connectMessage);