skip @typ key for feature DuplicateKeyValueAsArray, for issue #3284

alibaba · Feb 9, 2025 · 177f40d · 177f40d
1 parent 10e4381
commit 177f40d
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diff --git a/core/src/main/java/com/alibaba/fastjson2/JSONReader.java b/core/src/main/java/com/alibaba/fastjson2/JSONReader.java
@@ -2244,8 +2244,7 @@ public void read(Map object, long features) {
                 continue;
             }
 
-            if (i == 0
-                    && (contextFeatures & Feature.SupportAutoType.mask) != 0
+            if ((contextFeatures & Feature.SupportAutoType.mask) != 0
                     && name.equals("@type")
                     && object.getClass().getName().equals(value)
             ) {

diff --git a/core/src/test/java/com/alibaba/fastjson2/issues_3200/Issue3284.java b/core/src/test/java/com/alibaba/fastjson2/issues_3200/Issue3284.java
@@ -0,0 +1,18 @@
+package com.alibaba.fastjson2.issues_3200;
+
+import com.alibaba.fastjson2.JSON;
+import com.alibaba.fastjson2.JSONReader;
+import org.junit.jupiter.api.Test;
+
+import java.util.HashMap;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+
+public class Issue3284 {
+    @Test
+    public void test() {
+        String str = "{\"endDataTime\":\"2024\",\"@type\":\"java.util.HashMap\",\"startDataTime\":\"2023\"}";
+        HashMap hashMap = JSON.parseObject(str, HashMap.class, JSONReader.Feature.SupportAutoType);
+        assertFalse(hashMap.containsKey("@type"));
+    }
+}