diff --git a/redisson/src/main/java/org/redisson/RedissonDoubleAdder.java b/redisson/src/main/java/org/redisson/RedissonDoubleAdder.java
index 2803d7ef3..66cc94cb6 100644
--- a/redisson/src/main/java/org/redisson/RedissonDoubleAdder.java
+++ b/redisson/src/main/java/org/redisson/RedissonDoubleAdder.java
@@ -15,13 +15,12 @@
  */
 package org.redisson;
 
-import java.util.concurrent.atomic.DoubleAdder;
-
 import org.redisson.api.RAtomicDouble;
 import org.redisson.api.RDoubleAdder;
 import org.redisson.api.RFuture;
 import org.redisson.api.RedissonClient;
 import org.redisson.command.CommandAsyncExecutor;
+import org.redisson.misc.DoubleAdder;
 
 /**
  * 
diff --git a/redisson/src/main/java/org/redisson/RedissonObject.java b/redisson/src/main/java/org/redisson/RedissonObject.java
index 1c2e6e7dd..0bbd82121 100644
--- a/redisson/src/main/java/org/redisson/RedissonObject.java
+++ b/redisson/src/main/java/org/redisson/RedissonObject.java
@@ -57,14 +57,14 @@ public abstract class RedissonObject implements RObject {
         return commandExecutor.await(future, timeout, timeoutUnit);
     }
     
-    protected String prefixName(String prefix, String name) {
+    protected static String prefixName(String prefix, String name) {
         if (name.contains("{")) {
             return prefix + ":" + name;
         }
         return prefix + ":{" + name + "}";
     }
     
-    protected String suffixName(String name, String suffix) {
+    protected static String suffixName(String name, String suffix) {
         if (name.contains("{")) {
             return name + ":" + suffix;
         }