【bugfix】修复上下文类加载器切换恢复异常问题(develop)

sermant-plugins/sermant-springboot-registry/springboot-registry-plugin/src/main/java/com/huawei/discovery/interceptors/httpclient/HttpAsyncClient4xInterceptor.java

@@ -337,11 +337,14 @@ private HttpRequest rebuildRequest(String uriNew, String method, HttpRequest htt
             return httpPost;
         } else {
             final ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
-            Thread.currentThread().setContextClassLoader(HttpClient.class.getClassLoader());
-            final Optional<Object> result = ReflectUtils
-                    .buildWithConstructor(COMMON_REQUEST_CLASS,
-                            new Class[]{String.class, String.class}, new Object[]{method, uriNew});
-            Thread.currentThread().setContextClassLoader(contextClassLoader);
+            final Optional<Object> result;
+            try {
+                Thread.currentThread().setContextClassLoader(HttpClient.class.getClassLoader());
+                result = ReflectUtils.buildWithConstructor(COMMON_REQUEST_CLASS,
+                        new Class[]{String.class, String.class}, new Object[]{method, uriNew});
+            } finally {
+                Thread.currentThread().setContextClassLoader(contextClassLoader);
+            }
             return (HttpRequest) result.orElse(null);
         }
     }

sermant-plugins/sermant-springboot-registry/springboot-registry-service/src/main/java/com/huawei/discovery/service/lb/discovery/zk/ZkDiscoveryClient.java

@@ -164,6 +164,8 @@ public Collection<ServiceInstance> getInstances(String serviceId) throws QueryIn
             LOGGER.log(Level.WARNING, "Can not query service instances from registry center!", exception);
             Thread.currentThread().setContextClassLoader(contextClassLoader);
             throw new QueryInstanceException(exception.getMessage());
+        } finally {
+            Thread.currentThread().setContextClassLoader(contextClassLoader);
         }
     }
 
@@ -270,7 +272,9 @@ public void close() {
      */
     public static class ZkInstanceSerializer<T> implements InstanceSerializer<T> {
         private final ObjectMapper mapper;
+
         private final Class<T> payloadClass;
+
         private final JavaType type;
 
         /**