diff --git a/src/org/redkale/convert/ArrayDecoder.java b/src/org/redkale/convert/ArrayDecoder.java
index 2b78324ef..a404a30e1 100644
--- a/src/org/redkale/convert/ArrayDecoder.java
+++ b/src/org/redkale/convert/ArrayDecoder.java
@@ -28,7 +28,7 @@ public final class ArrayDecoder<T> implements Decodeable<Reader, T[]> {
 
     private final Class componentClass;
 
-    private final Decodeable<Reader, T> decoder;
+    protected final Decodeable<Reader, T> decoder;
 
     public ArrayDecoder(final ConvertFactory factory, final Type type) {
         this.type = type;
diff --git a/src/org/redkale/convert/CollectionDecoder.java b/src/org/redkale/convert/CollectionDecoder.java
index 0b0808ca7..db5545eb5 100644
--- a/src/org/redkale/convert/CollectionDecoder.java
+++ b/src/org/redkale/convert/CollectionDecoder.java
@@ -30,7 +30,7 @@ public final class CollectionDecoder<T> implements Decodeable<Reader, Collection
 
     protected Creator<Collection<T>> creator;
 
-    private final Decodeable<Reader, T> decoder;
+    protected final Decodeable<Reader, T> decoder;
 
     public CollectionDecoder(final ConvertFactory factory, final Type type) {
         this.type = type;
diff --git a/src/org/redkale/convert/MapDecoder.java b/src/org/redkale/convert/MapDecoder.java
index 9b053285e..fc1541c8b 100644
--- a/src/org/redkale/convert/MapDecoder.java
+++ b/src/org/redkale/convert/MapDecoder.java
@@ -28,9 +28,9 @@ public final class MapDecoder<K, V> implements Decodeable<Reader, Map<K, V>> {
 
     protected Creator<Map<K, V>> creator;
 
-    private final Decodeable<Reader, K> keyDecoder;
+    protected final Decodeable<Reader, K> keyDecoder;
 
-    private final Decodeable<Reader, V> valueDecoder;
+    protected final Decodeable<Reader, V> valueDecoder;
 
     public MapDecoder(final ConvertFactory factory, final Type type) {
         this.type = type;