Fix #5238

src/test-jdk17/java/com/fasterxml/jackson/databind/records/JsonIdentityOnRecord5328Test.java

@@ -0,0 +1,84 @@
+package com.fasterxml.jackson.databind.records;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+// [databind#5328] immutable classes with @JsonIdentityInfo can be deserialized; records cannot
+public class JsonIdentityOnRecord5328Test
+{
+
+    private final ObjectMapper MAPPER = new ObjectMapper();
+
+    // ✅ Working test with POJO
+    @Test
+    void testIdentityWithPojo() throws Exception {
+        ThingPojo t1 = new ThingPojo(1, "a");
+        ThingPojo t2 = new ThingPojo(2, "b");
+
+        ExamplePojo input = new ExamplePojo(List.of(t1, t2), t2);
+
+        String json = MAPPER.writeValueAsString(input);
+        ExamplePojo result = MAPPER.readValue(json, ExamplePojo.class);
+
+        assertEquals(input.selected.id, result.selected.id);
+        assertEquals(input.selected.name, result.selected.name);
+    }
+
+    // ❌ Failing test with record
+    @Test
+    void testIdentityWithRecord() throws Exception {
+        ThingRecord t1 = new ThingRecord(1, "a");
+        ThingRecord t2 = new ThingRecord(2, "b");
+
+        ExampleRecord input = new ExampleRecord(List.of(t1, t2), t2);
+
+        String json = MAPPER.writeValueAsString(input);
+
+        Exception ex = assertThrows(Exception.class, () ->
+                MAPPER.readValue(json, ExampleRecord.class));
+
+        System.out.println("Expected failure:");
+        ex.printStackTrace();
+    }
+
+    // Record-based data
+    record ExampleRecord(List<ThingRecord> allThings, ThingRecord selected) {}
+
+    @JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
+    record ThingRecord(int id, String name) {}
+
+    // POJO-based data
+    static class ExamplePojo {
+        public List<ThingPojo> allThings;
+        public ThingPojo selected;
+
+        @JsonCreator
+        public ExamplePojo(
+                @JsonProperty("allThings") List<ThingPojo> allThings,
+                @JsonProperty("selected") ThingPojo selected) {
+            this.allThings = allThings;
+            this.selected = selected;
+        }
+    }
+
+    @JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
+    static class ThingPojo {
+        public final int id;
+        public final String name;
+
+        @JsonCreator
+        public ThingPojo(@JsonProperty("id") int id, @JsonProperty("name") String name) {
+            this.id = id;
+            this.name = name;
+        }
+    }
+}