[ROCKETMQ-139] Degrade the client related modules' JDK version to 1.6

client/pom.xml

@@ -22,12 +22,16 @@
         <version>4.1.0-incubating-SNAPSHOT</version>
     </parent>
 
-
     <modelVersion>4.0.0</modelVersion>
     <packaging>jar</packaging>
     <artifactId>rocketmq-client</artifactId>
     <name>rocketmq-client ${project.version}</name>
 
+    <properties>
+        <maven.compiler.source>1.6</maven.compiler.source>
+        <maven.compiler.target>1.6</maven.compiler.target>
+    </properties>
+
     <dependencies>
         <dependency>
             <groupId>${project.groupId}</groupId>

client/src/main/java/org/apache/rocketmq/client/consumer/DefaultMQPushConsumer.java

@@ -133,7 +133,7 @@ public class DefaultMQPushConsumer extends ClientConfig implements MQPushConsume
     /**
      * Subscription relationship
      */
-    private Map<String /* topic */, String /* sub expression */> subscription = new HashMap<>();
+    private Map<String /* topic */, String /* sub expression */> subscription = new HashMap<String, String>();
 
     /**
      * Message listener

client/src/main/java/org/apache/rocketmq/client/impl/factory/MQClientInstance.java

@@ -842,7 +842,11 @@ public class MQClientInstance {
                         try {
                             this.mQClientAPIImpl.unregisterClient(addr, this.clientId, producerGroup, consumerGroup, 3000);
                             log.info("unregister client[Producer: {} Consumer: {}] from broker[{} {} {}] success", producerGroup, consumerGroup, brokerName, entry1.getKey(), addr);
-                        } catch (RemotingException | InterruptedException | MQBrokerException e) {
+                        } catch (RemotingException e) {
+                            log.error("unregister client exception from broker: " + addr, e);
+                        } catch (InterruptedException e) {
+                            log.error("unregister client exception from broker: " + addr, e);
+                        } catch (MQBrokerException e) {
                             log.error("unregister client exception from broker: " + addr, e);
                         }
                     }

client/src/test/java/org/apache/rocketmq/client/consumer/DefaultMQPullConsumerTest.java

@@ -99,7 +99,7 @@ public class DefaultMQPullConsumerTest {
         assertThat(pullResult.getNextBeginOffset()).isEqualTo(1024 + 1);
         assertThat(pullResult.getMinOffset()).isEqualTo(123);
         assertThat(pullResult.getMaxOffset()).isEqualTo(2048);
-        assertThat(pullResult.getMsgFoundList()).isEqualTo(new ArrayList<>());
+        assertThat(pullResult.getMsgFoundList()).isEqualTo(new ArrayList<Object>());
     }
 
     @Test
@@ -137,7 +137,7 @@ public class DefaultMQPullConsumerTest {
                 assertThat(pullResult.getNextBeginOffset()).isEqualTo(1024 + 1);
                 assertThat(pullResult.getMinOffset()).isEqualTo(123);
                 assertThat(pullResult.getMaxOffset()).isEqualTo(2048);
-                assertThat(pullResult.getMsgFoundList()).isEqualTo(new ArrayList<>());
+                assertThat(pullResult.getMsgFoundList()).isEqualTo(new ArrayList<Object>());
             }
 
             @Override public void onException(Throwable e) {

client/src/test/java/org/apache/rocketmq/client/consumer/DefaultMQPushConsumerTest.java

@@ -143,7 +143,7 @@ public class DefaultMQPushConsumerTest {
 
         doReturn(new FindBrokerResult("127.0.0.1:10911", false)).when(mQClientFactory).findBrokerAddressInSubscribe(anyString(), anyLong(), anyBoolean());
         doReturn(Collections.singletonList(mQClientFactory.getClientId())).when(mQClientFactory).findConsumerIdList(anyString(), anyString());
-        Set<MessageQueue> messageQueueSet = new HashSet<>();
+        Set<MessageQueue> messageQueueSet = new HashSet<MessageQueue>();
         messageQueueSet.add(createPullRequest().getMessageQueue());
         pushConsumer.getDefaultMQPushConsumerImpl().updateTopicSubscribeInfo(topic, messageQueueSet);
         doReturn(123L).when(rebalancePushImpl).computePullFromWhere(any(MessageQueue.class));

client/src/test/java/org/apache/rocketmq/client/consumer/store/LocalFileOffsetStoreTest.java

@@ -69,7 +69,7 @@ public class LocalFileOffsetStoreTest {
         offsetStore.updateOffset(messageQueue, 1024, false);
         assertThat(offsetStore.readOffset(messageQueue, ReadOffsetType.READ_FROM_STORE)).isEqualTo(-1);
 
-        offsetStore.persistAll(new HashSet<>(Collections.singletonList(messageQueue)));
+        offsetStore.persistAll(new HashSet<MessageQueue>(Collections.singletonList(messageQueue)));
         assertThat(offsetStore.readOffset(messageQueue, ReadOffsetType.READ_FROM_STORE)).isEqualTo(1024);
     }
 }
\ No newline at end of file

client/src/test/java/org/apache/rocketmq/client/consumer/store/RemoteBrokerOffsetStoreTest.java

@@ -119,7 +119,7 @@ public class RemoteBrokerOffsetStoreTest {
         assertThat(offsetStore.readOffset(messageQueue, ReadOffsetType.READ_FROM_STORE)).isEqualTo(1023);
 
         offsetStore.updateOffset(messageQueue, 1025, false);
-        offsetStore.persistAll(new HashSet<>(Collections.singletonList(messageQueue)));
+        offsetStore.persistAll(new HashSet<MessageQueue>(Collections.singletonList(messageQueue)));
         assertThat(offsetStore.readOffset(messageQueue, ReadOffsetType.READ_FROM_STORE)).isEqualTo(1025);
     }
 

client/src/test/java/org/apache/rocketmq/client/impl/factory/MQClientInstanceTest.java

@@ -48,17 +48,17 @@ public class MQClientInstanceTest {
         TopicRouteData topicRouteData = new TopicRouteData();
 
         topicRouteData.setFilterServerTable(new HashMap<String, List<String>>());
-        List<BrokerData> brokerDataList = new ArrayList<>();
+        List<BrokerData> brokerDataList = new ArrayList<BrokerData>();
         BrokerData brokerData = new BrokerData();
         brokerData.setBrokerName("BrokerA");
         brokerData.setCluster("DefaultCluster");
-        HashMap<Long, String> brokerAddrs = new HashMap<>();
+        HashMap<Long, String> brokerAddrs = new HashMap<Long, String>();
         brokerAddrs.put(0L, "127.0.0.1:10911");
         brokerData.setBrokerAddrs(brokerAddrs);
         brokerDataList.add(brokerData);
         topicRouteData.setBrokerDatas(brokerDataList);
 
-        List<QueueData> queueDataList = new ArrayList<>();
+        List<QueueData> queueDataList = new ArrayList<QueueData>();
         QueueData queueData = new QueueData();
         queueData.setBrokerName("BrokerA");
         queueData.setPerm(6);

client/src/test/java/org/apache/rocketmq/client/producer/DefaultMQProducerTest.java

@@ -194,17 +194,17 @@ public class DefaultMQProducerTest {
         TopicRouteData topicRouteData = new TopicRouteData();
 
         topicRouteData.setFilterServerTable(new HashMap<String, List<String>>());
-        List<BrokerData> brokerDataList = new ArrayList<>();
+        List<BrokerData> brokerDataList = new ArrayList<BrokerData>();
         BrokerData brokerData = new BrokerData();
         brokerData.setBrokerName("BrokerA");
         brokerData.setCluster("DefaultCluster");
-        HashMap<Long, String> brokerAddrs = new HashMap<>();
+        HashMap<Long, String> brokerAddrs = new HashMap<Long, String>();
         brokerAddrs.put(0L, "127.0.0.1:10911");
         brokerData.setBrokerAddrs(brokerAddrs);
         brokerDataList.add(brokerData);
         topicRouteData.setBrokerDatas(brokerDataList);
 
-        List<QueueData> queueDataList = new ArrayList<>();
+        List<QueueData> queueDataList = new ArrayList<QueueData>();
         QueueData queueData = new QueueData();
         queueData.setBrokerName("BrokerA");
         queueData.setPerm(6);

client/src/test/java/org/apache/rocketmq/client/producer/selector/SelectMessageQueueByHashTest.java

@@ -34,7 +34,7 @@ public class SelectMessageQueueByHashTest {
 
         Message message = new Message(topic, new byte[] {});
 
-        List<MessageQueue> messageQueues = new ArrayList<>();
+        List<MessageQueue> messageQueues = new ArrayList<MessageQueue>();
         for (int i = 0; i < 10; i++) {
             MessageQueue messageQueue = new MessageQueue(topic, "DefaultBroker", i);
             messageQueues.add(messageQueue);

common/pom.xml

@@ -27,6 +27,10 @@
     <artifactId>rocketmq-common</artifactId>
     <name>rocketmq-common ${project.version}</name>
 
+    <properties>
+        <maven.compiler.source>1.6</maven.compiler.source>
+        <maven.compiler.target>1.6</maven.compiler.target>
+    </properties>
 
     <dependencies>
         <dependency>

common/src/main/java/org/apache/rocketmq/common/MixAll.java

@@ -256,7 +256,7 @@ public class MixAll {
                         if (null == value) {
                             value = "";
                         }
-                    } catch (IllegalArgumentException | IllegalAccessException e) {
+                    } catch (IllegalAccessException e) {
                         e.printStackTrace();
                     }
 
@@ -313,7 +313,7 @@ public class MixAll {
                     try {
                         field.setAccessible(true);
                         value = field.get(object);
-                    } catch (IllegalArgumentException | IllegalAccessException e) {
+                    } catch (IllegalAccessException e) {
                         e.printStackTrace();
                     }
 

common/src/test/java/org/apache/rocketmq/common/MixAllTest.java

@@ -59,9 +59,9 @@ public class MixAllTest {
             file.delete();
         }
         file.createNewFile();
-        try (PrintWriter out = new PrintWriter(fileName)) {
-            out.write("TestForMixAll");
-        }
+        PrintWriter out = new PrintWriter(fileName);
+        out.write("TestForMixAll");
+        out.close();
         String string = MixAll.file2String(fileName);
         assertThat(string).isEqualTo("TestForMixAll");
         file.delete();

common/src/test/java/org/apache/rocketmq/common/filter/FilterAPITest.java

@@ -36,7 +36,7 @@ public class FilterAPITest {
         assertThat(subscriptionData.getTopic()).isEqualTo(topic);
         assertThat(subscriptionData.getSubString()).isEqualTo(subString);
         String [] tags = subString.split("\\|\\|");
-        Set<String> tagSet = new HashSet<>();
+        Set<String> tagSet = new HashSet<String>();
         for (String tag : tags) {
             tagSet.add(tag.trim());
         }

remoting/pom.xml

@@ -27,6 +27,10 @@
     <artifactId>rocketmq-remoting</artifactId>
     <name>rocketmq-remoting ${project.version}</name>
 
+    <properties>
+        <maven.compiler.source>1.6</maven.compiler.source>
+        <maven.compiler.target>1.6</maven.compiler.target>
+    </properties>
 
     <dependencies>
         <dependency>

remoting/src/main/java/org/apache/rocketmq/remoting/netty/NettyRemotingClient.java

@@ -73,12 +73,12 @@ public class NettyRemotingClient extends NettyRemotingAbstract implements Remoti
     private final Bootstrap bootstrap = new Bootstrap();
     private final EventLoopGroup eventLoopGroupWorker;
     private final Lock lockChannelTables = new ReentrantLock();
-    private final ConcurrentHashMap<String /* addr */, ChannelWrapper> channelTables = new ConcurrentHashMap<>();
+    private final ConcurrentHashMap<String /* addr */, ChannelWrapper> channelTables = new ConcurrentHashMap<String, ChannelWrapper>();
 
     private final Timer timer = new Timer("ClientHouseKeepingService", true);
 
-    private final AtomicReference<List<String>> namesrvAddrList = new AtomicReference<>();
-    private final AtomicReference<String> namesrvAddrChoosed = new AtomicReference<>();
+    private final AtomicReference<List<String>> namesrvAddrList = new AtomicReference<List<String>>();
+    private final AtomicReference<String> namesrvAddrChoosed = new AtomicReference<String>();
     private final AtomicInteger namesrvIndex = new AtomicInteger(initValueIndex());
     private final Lock lockNamesrvChannel = new ReentrantLock();
 
@@ -522,7 +522,7 @@ public class NettyRemotingClient extends NettyRemotingAbstract implements Remoti
             executorThis = this.publicExecutor;
         }
 
-        Pair<NettyRequestProcessor, ExecutorService> pair = new Pair<>(processor, executorThis);
+        Pair<NettyRequestProcessor, ExecutorService> pair = new Pair<NettyRequestProcessor, ExecutorService>(processor, executorThis);
         this.processorTable.put(requestCode, pair);
     }