[ISSUE #282] Upgrade RocketMQ version to 4.7.1

diff --git a/rocketmq-spring-boot-parent/pom.xml b/rocketmq-spring-boot-parent/pom.xml
index b1e0d3c..7b990d6 100644
--- a/rocketmq-spring-boot-parent/pom.xml
+++ b/rocketmq-spring-boot-parent/pom.xml
@@ -40,7 +40,7 @@
 
         <rocketmq.spring.boot.version>2.1.1-SNAPSHOT</rocketmq.spring.boot.version>
 
-        <rocketmq-version>4.7.0</rocketmq-version>
+        <rocketmq-version>4.7.1</rocketmq-version>
         <slf4j.version>1.7.25</slf4j.version>
         <jackson.version>2.9.7</jackson.version>
 
diff --git a/rocketmq-spring-boot/src/main/java/org/apache/rocketmq/spring/autoconfigure/RocketMQProperties.java b/rocketmq-spring-boot/src/main/java/org/apache/rocketmq/spring/autoconfigure/RocketMQProperties.java
index 1957389..c08b377 100644
--- a/rocketmq-spring-boot/src/main/java/org/apache/rocketmq/spring/autoconfigure/RocketMQProperties.java
+++ b/rocketmq-spring-boot/src/main/java/org/apache/rocketmq/spring/autoconfigure/RocketMQProperties.java
@@ -17,7 +17,7 @@
 
 package org.apache.rocketmq.spring.autoconfigure;
 
-import org.apache.rocketmq.common.MixAll;
+import org.apache.rocketmq.common.topic.TopicValidator;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 
 import java.util.HashMap;
@@ -130,7 +130,7 @@
         /**
          * The name value of message trace topic.If you don't config,you can use the default trace topic name.
          */
-        private String customizedTraceTopic = MixAll.RMQ_SYS_TRACE_TOPIC;
+        private String customizedTraceTopic = TopicValidator.RMQ_SYS_TRACE_TOPIC;
 
         public String getGroup() {
             return group;