fix:#558 com.alibaba.dubbo.common.serialize.support.dubbo.Builder#new…

…ObjectBuilder 存在死循环的风险 (#589)

dubbo-common/src/main/java/com/alibaba/dubbo/common/serialize/support/dubbo/Builder.java

@@ -983,7 +983,7 @@ private static Builder<?> newObjectBuilder(final Class<?> c) {
                 t = t.getSuperclass();
                 if (t == null)
                     throw new RuntimeException("Can not found Constructor?");
-                cs = c.getDeclaredConstructors();
+                cs = t.getDeclaredConstructors();
             }
             while (cs.length == 0);
         }