From 05edc921752c40fa66e11c823f151b05c49bda52 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=AB=98=E9=93=81?= <shaojin.wensj@alibaba-inc.com>
Date: Thu, 8 Aug 2024 09:31:36 +0800
Subject: [PATCH] bug fix for issue #2851

---
 .../reader/ObjectReaderImplList.java          |  3 +++
 .../fastjson2/issues_2800/Issue2851.java      | 22 +++++++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 core/src/test/java/com/alibaba/fastjson2/issues_2800/Issue2851.java

diff --git a/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderImplList.java b/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderImplList.java
index 001ddd564e..97d4c46039 100644
--- a/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderImplList.java
+++ b/core/src/main/java/com/alibaba/fastjson2/reader/ObjectReaderImplList.java
@@ -174,6 +174,9 @@ public static ObjectReader of(Type type, Class listClass, long features) {
                     instanceClass = TreeSet.class;
                     builder = (Function<NavigableSet, NavigableSet>) Collections::synchronizedNavigableSet;
                     break;
+                case "java.util.AbstractList$RandomAccessSubList":
+                    instanceClass = ArrayList.class;
+                    break;
                 default:
                     instanceClass = listClass;
             }
diff --git a/core/src/test/java/com/alibaba/fastjson2/issues_2800/Issue2851.java b/core/src/test/java/com/alibaba/fastjson2/issues_2800/Issue2851.java
new file mode 100644
index 0000000000..2f57d2794c
--- /dev/null
+++ b/core/src/test/java/com/alibaba/fastjson2/issues_2800/Issue2851.java
@@ -0,0 +1,22 @@
+package com.alibaba.fastjson2.issues_2800;
+
+import com.alibaba.fastjson2.*;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class Issue2851 {
+    @Test
+    public void test() {
+        List<String> list = Arrays.asList("").subList(0, 1);
+        byte[] bytes = JSONB.toBytes(list, JSONWriter.Feature.WriteClassName);
+        JSONReader.AutoTypeBeforeHandler autoTypeFilter = JSONReader.autoTypeFilter("java.util.AbstractList");
+        JSONReader.Context context = JSONFactory.createReadContext();
+        context.config(autoTypeFilter);
+        List<String> parsed = (List<String>) JSONB.parse(bytes, context);
+        assertEquals(list.get(0), parsed.get(0));
+    }
+}