diff --git a/src/org/redkale/convert/ConvertFactory.java b/src/org/redkale/convert/ConvertFactory.java
index 5883be176..9f83668b9 100644
--- a/src/org/redkale/convert/ConvertFactory.java
+++ b/src/org/redkale/convert/ConvertFactory.java
@@ -615,6 +615,7 @@ public abstract class ConvertFactory<R extends Reader, W extends Writer> {
             decoder = od;
         } else if (!clazz.getName().startsWith("java.")
             || java.net.HttpCookie.class == clazz
+            || java.util.AbstractMap.SimpleEntry.class == clazz
             || clazz.getName().startsWith("java.awt.geom.Point2D")) {
             Decodeable simpleCoder = null;
             for (final Method method : clazz.getDeclaredMethods()) {
@@ -698,7 +699,7 @@ public abstract class ConvertFactory<R extends Reader, W extends Writer> {
             encoder = new OptionalCoder(this, type);
         } else if (clazz == Object.class) {
             return (Encodeable<W, E>) this.anyEncoder;
-        } else if (!clazz.getName().startsWith("java.") || java.net.HttpCookie.class == clazz) {
+        } else if (!clazz.getName().startsWith("java.") || java.net.HttpCookie.class == clazz || java.util.AbstractMap.SimpleEntry.class == clazz) {
             Encodeable simpleCoder = null;
             for (final Method method : clazz.getDeclaredMethods()) {
                 if (!Modifier.isStatic(method.getModifiers())) continue;
diff --git a/src/org/redkale/service/RetResult.java b/src/org/redkale/service/RetResult.java
index 98fcb46b1..5187ab47b 100644
--- a/src/org/redkale/service/RetResult.java
+++ b/src/org/redkale/service/RetResult.java
@@ -54,11 +54,11 @@ public class RetResult<T> {
         this.result = result;
     }
 
-    public static RetResult success() {
-        return new RetResult();
+    public static <T> RetResult<T> success() {
+        return new RetResult<>();
     }
 
-    public static <V> RetResult success(V result) {
+    public static <V, T> RetResult<T> success(V result) {
         return new RetResult().result(result);
     }
 
diff --git a/src/org/redkale/util/Creator.java b/src/org/redkale/util/Creator.java
index 563ee4c2a..e798b67f2 100644
--- a/src/org/redkale/util/Creator.java
+++ b/src/org/redkale/util/Creator.java
@@ -85,6 +85,13 @@ public interface Creator<T> {
             creatorCacheMap.put(Stream.class, (params) -> new ArrayList<>().stream());
             creatorCacheMap.put(ConcurrentHashMap.class, (params) -> new ConcurrentHashMap<>());
             creatorCacheMap.put(CompletableFuture.class, (params) -> new CompletableFuture<>());
+            creatorCacheMap.put(AbstractMap.SimpleEntry.class, new Creator<AbstractMap.SimpleEntry>() {
+                @Override
+                @ConstructorParameters({"key", "value"})
+                public AbstractMap.SimpleEntry create(Object... params) {
+                    return new AbstractMap.SimpleEntry(params[0], params[1]);
+                }
+            });
         }
 
         static class SimpleClassVisitor extends ClassVisitor {