重构类结构

discovery-plugin-framework/src/main/java/com/nepxion/discovery/plugin/framework/adapter/AbstractPluginAdapter.java

@@ -25,7 +25,7 @@ import com.netflix.loadbalancer.Server;
 
 public abstract class AbstractPluginAdapter implements PluginAdapter {
     @Autowired
-    private Registration registration;
+    protected Registration registration;
 
     @Autowired
     protected PluginContextAware pluginContextAware;
@@ -42,7 +42,7 @@ public abstract class AbstractPluginAdapter implements PluginAdapter {
 
         String group = getMetaData().get(groupKey);
         if (StringUtils.isEmpty(group)) {
-            throw new PluginException("The value is empty for metadata key=" + groupKey + ", please check your configuration");
+            throw new PluginException("The value is null or empty for metadata key=" + groupKey + ", please check your configuration");
         }
 
         return group;