使用timer处理重试任务

Author: chengyouling

clients/service-center-client/src/main/java/org/apache/servicecomb/service/center/client/DiscoveryEvents.java

@@ -27,7 +27,7 @@
 import com.fasterxml.jackson.databind.ObjectMapper;
 
 public abstract class DiscoveryEvents {
-  private final static ObjectMapper OBJECT_MAPPER = new ObjectMapper();
+  private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
 
   public static class InstanceChangedEvent extends DiscoveryEvents {
     private final String appName;