diff --git a/pom.xml b/pom.xml
index d594a98..0758534 100644
--- a/pom.xml
+++ b/pom.xml
@@ -62,7 +62,7 @@
         <dependency>
             <groupId>io.netty</groupId>
             <artifactId>netty-handler</artifactId>
-            <version>4.1.65.Final</version>
+            <version>4.1.66.Final</version>
             <scope>provided</scope>
         </dependency>
         <dependency>
diff --git a/src/main/java/io/github/yezhihao/netmc/codec/MessageDecoderWrapper.java b/src/main/java/io/github/yezhihao/netmc/codec/MessageDecoderWrapper.java
index 2afa06b..a43539f 100644
--- a/src/main/java/io/github/yezhihao/netmc/codec/MessageDecoderWrapper.java
+++ b/src/main/java/io/github/yezhihao/netmc/codec/MessageDecoderWrapper.java
@@ -2,6 +2,7 @@ package io.github.yezhihao.netmc.codec;
 
 import io.github.yezhihao.netmc.session.Session;
 import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufUtil;
 import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInboundHandlerAdapter;
@@ -31,7 +32,7 @@ public class MessageDecoderWrapper extends ChannelInboundHandlerAdapter {
                     ctx.fireChannelRead(message);
                 buf.skipBytes(buf.readableBytes());
             } catch (Exception e) {
-                throw new DecoderException(e);
+                throw new DecoderException(ByteBufUtil.hexDump(buf), e);
             } finally {
                 buf.release();
             }
diff --git a/src/main/java/io/github/yezhihao/netmc/util/AdapterCollection.java b/src/main/java/io/github/yezhihao/netmc/util/AdapterCollection.java
new file mode 100644
index 0000000..dcf878f
--- /dev/null
+++ b/src/main/java/io/github/yezhihao/netmc/util/AdapterCollection.java
@@ -0,0 +1,50 @@
+package io.github.yezhihao.netmc.util;
+
+import java.util.AbstractCollection;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.function.Function;
+
+/**
+ * @author yezhihao
+ * home https://gitee.com/yezhihao/jt808-server
+ */
+public final class AdapterCollection<S, T> extends AbstractCollection<T> {
+
+    private final Collection<S> src;
+    private final Iterator<T> iterator;
+
+    public AdapterCollection(Collection<S> src, Function<S, T> function) {
+        this.src = src;
+        this.iterator = new Iterator<T>() {
+
+            private final Function<S, T> f = function;
+            private final Iterator<S> it = src.iterator();
+
+            @Override
+            public boolean hasNext() {
+                return it.hasNext();
+            }
+
+            @Override
+            public T next() {
+                return f.apply(it.next());
+            }
+
+            @Override
+            public void remove() {
+                it.remove();
+            }
+        };
+    }
+
+    @Override
+    public Iterator<T> iterator() {
+        return iterator;
+    }
+
+    @Override
+    public int size() {
+        return src.size();
+    }
+}
\ No newline at end of file