From 097671a525b0292996f59c73e3174b8d222eeb93 Mon Sep 17 00:00:00 2001
From: mark4z <mark4z@apache.com>
Date: Sun, 3 Jul 2022 15:03:51 +0800
Subject: [PATCH] nil slice decode to empty slice

---
 list.go      |  7 ++++++-
 list_test.go | 13 +++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/list.go b/list.go
index c89bc49d..0ce242b8 100644
--- a/list.go
+++ b/list.go
@@ -152,7 +152,12 @@ func (e *Encoder) writeTypedList(v interface{}) error {
 	var err error
 
 	value := reflect.ValueOf(v)
-
+	// https://github.com/apache/dubbo-go-hessian2/issues/317
+	// if list is null, just return 'N'
+	if value.IsNil() {
+		e.buffer = encByte(e.buffer, BC_NULL) // 'N'
+		return nil
+	}
 	// check ref
 	if n, ok := e.checkRefMap(value); ok {
 		e.buffer = encRef(e.buffer, n)
diff --git a/list_test.go b/list_test.go
index 65783669..849e9bbd 100644
--- a/list_test.go
+++ b/list_test.go
@@ -207,6 +207,19 @@ func TestListEncode(t *testing.T) {
 	testJavaDecode(t, "customArgTypedFixedList_Object", []Object{new(A0)})
 }
 
+func TestNilList(t *testing.T) {
+	var List []*A0
+	e := NewEncoder()
+	_ = e.Encode(List)
+
+	d := NewDecoder(e.Buffer())
+	res, err := d.Decode()
+	if err != nil {
+		t.Fail()
+	}
+	assert.Nil(t, res)
+}
+
 type TypedListTest struct {
 	A     *A0
 	List  [][]*A0