bug fix for issue #2851

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;
  }

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));
+ }
+}