diff --git a/src/main/java/org/redkale/boot/ApiDocCommand.java b/src/main/java/org/redkale/boot/ApiDocCommand.java
index a2891e703..acd326065 100644
--- a/src/main/java/org/redkale/boot/ApiDocCommand.java
+++ b/src/main/java/org/redkale/boot/ApiDocCommand.java
@@ -699,7 +699,7 @@ public final class ApiDocCommand {
                                 factory,
                                 logger,
                                 componentsMap,
-                                ((SimpledCoder) member.getEncoder()).getType(),
+                                TypeToken.typeToClass(((SimpledCoder) member.getEncoder()).getType()),
                                 ((SimpledCoder) member.getEncoder()).getType(),
                                 new LinkedHashMap<>(),
                                 true);
@@ -756,7 +756,7 @@ public final class ApiDocCommand {
             }
             return sb + (array ? "_Array" : "_Collection");
         } else if (encodeable instanceof SimpledCoder) {
-            Class stype = ((SimpledCoder) encodeable).getType();
+            Class stype = TypeToken.typeToClass(((SimpledCoder) encodeable).getType());
             if (stype.isPrimitive()
                     || stype == Boolean.class
                     || Number.class.isAssignableFrom(stype)
diff --git a/src/main/java/org/redkale/convert/OptionalCoder.java b/src/main/java/org/redkale/convert/OptionalCoder.java
index c09b79505..a77bcd572 100644
--- a/src/main/java/org/redkale/convert/OptionalCoder.java
+++ b/src/main/java/org/redkale/convert/OptionalCoder.java
@@ -110,9 +110,4 @@ public class OptionalCoder<R extends Reader, W extends Writer, T> extends Simple
         }
         return Optional.ofNullable(this.decoder.convertFrom(in));
     }
-
-    @Override
-    public Class getType() {
-        return Optional.class;
-    }
 }
diff --git a/src/main/java/org/redkale/convert/SimpledCoder.java b/src/main/java/org/redkale/convert/SimpledCoder.java
index f386e6bdc..7f154c79d 100644
--- a/src/main/java/org/redkale/convert/SimpledCoder.java
+++ b/src/main/java/org/redkale/convert/SimpledCoder.java
@@ -32,7 +32,7 @@ public abstract class SimpledCoder<R extends Reader, W extends Writer, T>
 
     @Override
     @SuppressWarnings("unchecked")
-    public Class<T> getType() {
+    public Type getType() {
         if (type == null) {
             Type[] ts = ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments();
             type = ts[ts.length - 1];
@@ -40,7 +40,7 @@ public abstract class SimpledCoder<R extends Reader, W extends Writer, T>
                 throw new ConvertException(type + " is not class");
             }
         }
-        return (Class<T>) type;
+        return type;
     }
 
     @Override