[type:bugfix] fix http sync error

shenyu-admin/src/main/java/org/apache/shenyu/admin/config/HttpLongPollingSyncConfiguration.java

@@ -19,6 +19,8 @@
 
 import org.apache.shenyu.admin.config.properties.HttpSyncProperties;
 import org.apache.shenyu.admin.listener.http.HttpLongPollingDataChangedListener;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
@@ -32,6 +34,8 @@
 @EnableConfigurationProperties(HttpSyncProperties.class)
 @ConditionalOnProperty(name = "shenyu.sync.http.enabled", havingValue = "true")
 public class HttpLongPollingSyncConfiguration {
+
+    private static final Logger LOG = LoggerFactory.getLogger(HttpLongPollingSyncConfiguration.class);
 
     /**
      * httpLongPollingDataChangedListener.
@@ -42,6 +46,7 @@ public class HttpLongPollingSyncConfiguration {
     @Bean
     @ConditionalOnMissingBean(HttpLongPollingDataChangedListener.class)
     public HttpLongPollingDataChangedListener httpLongPollingDataChangedListener(final HttpSyncProperties httpSyncProperties) {
+        LOG.info("support http sync, initing HttpLongPollingDataChangedListener");
         return new HttpLongPollingDataChangedListener(httpSyncProperties);
     }
 }