[ISSUE #3361]DefaultMQProducer's constructor can call the overloaded constructor. (#3362)

Co-authored-by: Nzhangjidi <zhangjidi@cmss.chinamobile.com>

client/src/main/java/org/apache/rocketmq/client/producer/DefaultMQProducer.java

@@ -158,22 +158,7 @@ public class DefaultMQProducer extends ClientConfig implements MQProducer {
      */
     public DefaultMQProducer(final String producerGroup, RPCHook rpcHook, boolean enableMsgTrace,
         final String customizedTraceTopic) {
-        this.producerGroup = producerGroup;
-        defaultMQProducerImpl = new DefaultMQProducerImpl(this, rpcHook);
-        //if client open the message trace feature
-        if (enableMsgTrace) {
-            try {
-                AsyncTraceDispatcher dispatcher = new AsyncTraceDispatcher(producerGroup, TraceDispatcher.Type.PRODUCE, customizedTraceTopic, rpcHook);
-                dispatcher.setHostProducer(this.defaultMQProducerImpl);
-                traceDispatcher = dispatcher;
-                this.defaultMQProducerImpl.registerSendMessageHook(
-                    new SendMessageTraceHookImpl(traceDispatcher));
-                this.defaultMQProducerImpl.registerEndTransactionHook(
-                    new EndTransactionTraceHookImpl(traceDispatcher));
-            } catch (Throwable e) {
-                log.error("system mqtrace hook init failed ,maybe can't send msg trace data");
-            }
-        }
+        this(null, producerGroup, rpcHook, enableMsgTrace, customizedTraceTopic);
     }
 
     /**
@@ -251,9 +236,9 @@ public class DefaultMQProducer extends ClientConfig implements MQProducer {
         if (enableMsgTrace) {
             try {
                 AsyncTraceDispatcher dispatcher = new AsyncTraceDispatcher(producerGroup, TraceDispatcher.Type.PRODUCE, customizedTraceTopic, rpcHook);
-                dispatcher.setHostProducer(this.getDefaultMQProducerImpl());
+                dispatcher.setHostProducer(this.defaultMQProducerImpl);
                 traceDispatcher = dispatcher;
-                this.getDefaultMQProducerImpl().registerSendMessageHook(
+                this.defaultMQProducerImpl.registerSendMessageHook(
                     new SendMessageTraceHookImpl(traceDispatcher));
                 this.defaultMQProducerImpl.registerEndTransactionHook(
                     new EndTransactionTraceHookImpl(traceDispatcher));