fix jsonb deserialize error on null list field ,for issue #2181

core/src/main/java/com/alibaba/fastjson2/reader/FieldReaderList.java

@@ -139,7 +139,9 @@ public void readFieldValue(JSONReader jsonReader, T object) {
     public Object readFieldValue(JSONReader jsonReader) {
         if (jsonReader.jsonb) {
             int entryCnt = jsonReader.startArray();
-
+            if (entryCnt == -1) {
+                return null;
+            }
             Object[] array = new Object[entryCnt];
             ObjectReader itemObjectReader
                     = getItemObjectReader(

core/src/test/java/com/alibaba/fastjson2/issues_2100/Issue2181.java

@@ -0,0 +1,70 @@
+package com.alibaba.fastjson2.issues_2100;
+
+import com.alibaba.fastjson2.JSONB;
+import com.alibaba.fastjson2.JSONReader;
+import com.alibaba.fastjson2.JSONWriter;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+import org.apache.dubbo.common.serialize.fastjson2.FastJson2ObjectInput;
+import org.apache.dubbo.common.serialize.fastjson2.FastJson2ObjectOutput;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * @author 张治保
+ * @since 2024/1/15
+ */
+public class Issue2181 {
+    @ToString
+    @Getter
+    @Setter
+    public static class CommonException extends RuntimeException {
+        Integer code;
+        String message;
+        List params;
+
+        public CommonException(Integer code, String message) {
+//            super(message);
+            this.message = message;
+            this.code = code;
+        }
+
+    }
+
+    /**
+     * @see FastJson2ObjectOutput#writeObject(Object)
+     * @see FastJson2ObjectInput#readObject(Class)
+     */
+    @Test
+    void test() {
+        //writeObject
+        CommonException error = new CommonException(1, "error");
+        byte[] bytes = JSONB.toBytes(
+                error,
+                JSONWriter.Feature.WriteClassName,
+                JSONWriter.Feature.FieldBased,
+                JSONWriter.Feature.ErrorOnNoneSerializable,
+                JSONWriter.Feature.ReferenceDetection,
+                JSONWriter.Feature.WriteNulls,
+                JSONWriter.Feature.NotWriteDefaultValue,
+                JSONWriter.Feature.NotWriteHashMapArrayListClassName,
+                JSONWriter.Feature.WriteNameAsSymbol);
+        // readObject
+        Object result = JSONB.parseObject(
+                bytes,
+                Exception.class,
+                JSONReader.autoTypeFilter(true, CommonException.class),
+                JSONReader.Feature.UseDefaultConstructorAsPossible,
+                JSONReader.Feature.ErrorOnNoneSerializable,
+                JSONReader.Feature.IgnoreAutoTypeNotMatch,
+                JSONReader.Feature.UseNativeObject,
+                JSONReader.Feature.FieldBased);
+        assertNotNull(result);
+        assertSame(result.getClass(), CommonException.class);
+    }
+}

pom.xml

@@ -660,6 +660,7 @@
                                 com/alibaba/fastjson2/util/BeanUtilsTest.java,
                                 com/alibaba/fastjson2/issues_1000/Issue1395.java,
                                 com/alibaba/fastjson2/issues_2100/Issue2164.java,
+                                com/alibaba/fastjson2/issues_2100/Issue2181.java,
                                 com/alibaba/fastjson/v2issues/Issue1432.java
                             </excludes>
                         </configuration>