diff --git a/src/com/wentch/redkale/convert/bson/BsonByteBufferWriter.java b/src/com/wentch/redkale/convert/bson/BsonByteBufferWriter.java
index 61d07339e..247f07279 100644
--- a/src/com/wentch/redkale/convert/bson/BsonByteBufferWriter.java
+++ b/src/com/wentch/redkale/convert/bson/BsonByteBufferWriter.java
@@ -20,7 +20,7 @@ public final class BsonByteBufferWriter extends BsonWriter {
 
     private int index;
 
-    public BsonByteBufferWriter(Supplier<ByteBuffer> supplier) {
+    protected BsonByteBufferWriter(Supplier<ByteBuffer> supplier) {
         super((byte[]) null);
         this.supplier = supplier;
     }
diff --git a/src/com/wentch/redkale/convert/bson/BsonConvert.java b/src/com/wentch/redkale/convert/bson/BsonConvert.java
index 939a20231..1f5750a6e 100644
--- a/src/com/wentch/redkale/convert/bson/BsonConvert.java
+++ b/src/com/wentch/redkale/convert/bson/BsonConvert.java
@@ -44,6 +44,10 @@ public final class BsonConvert extends Convert<BsonReader, BsonWriter> {
         this.tiny = tiny;
     }
 
+    public BsonByteBufferWriter pollBsonWriter(final Supplier<ByteBuffer> supplier) {
+        return new BsonByteBufferWriter(supplier).setTiny(tiny);
+    }
+
     public BsonWriter pollBsonWriter() {
         return writerPool.get().setTiny(tiny);
     }
diff --git a/src/com/wentch/redkale/convert/json/JsonByteBufferWriter.java b/src/com/wentch/redkale/convert/json/JsonByteBufferWriter.java
index 54a604956..34882e304 100644
--- a/src/com/wentch/redkale/convert/json/JsonByteBufferWriter.java
+++ b/src/com/wentch/redkale/convert/json/JsonByteBufferWriter.java
@@ -27,15 +27,21 @@ public final class JsonByteBufferWriter extends JsonWriter {
 
     private int index;
 
-    public JsonByteBufferWriter(Supplier<ByteBuffer> supplier) {
+    protected JsonByteBufferWriter(Supplier<ByteBuffer> supplier) {
         this(null, supplier);
     }
 
-    public JsonByteBufferWriter(Charset charset, Supplier<ByteBuffer> supplier) {
+    protected JsonByteBufferWriter(Charset charset, Supplier<ByteBuffer> supplier) {
         this.charset = UTF8.equals(charset) ? null : charset;
         this.supplier = supplier;
     }
 
+    @Override
+    public JsonByteBufferWriter setTiny(boolean tiny) {
+        this.tiny = tiny;
+        return this;
+    }
+
     @Override
     protected boolean recycle() {
         this.index = 0;
diff --git a/src/com/wentch/redkale/convert/json/JsonConvert.java b/src/com/wentch/redkale/convert/json/JsonConvert.java
index 5f7ef298f..cfa34e3be 100644
--- a/src/com/wentch/redkale/convert/json/JsonConvert.java
+++ b/src/com/wentch/redkale/convert/json/JsonConvert.java
@@ -33,6 +33,14 @@ public final class JsonConvert extends Convert<JsonReader, JsonWriter> {
         this.tiny = tiny;
     }
 
+    public JsonByteBufferWriter pollJsonWriter(final Supplier<ByteBuffer> supplier) {
+        return new JsonByteBufferWriter(supplier).setTiny(tiny);
+    }
+
+    public JsonByteBufferWriter pollJsonWriter(final Charset charset, final Supplier<ByteBuffer> supplier) {
+        return new JsonByteBufferWriter(charset, supplier).setTiny(tiny);
+    }
+
     public JsonWriter pollJsonWriter() {
         return writerPool.get().setTiny(tiny);
     }