TestDictionaryItem item1 = new TestDictionaryItem();
        TestDictionaryItem item2 = new TestDictionaryItem();

        item1.id = 100L;
        item2.id = 200L;

        assertEquals(100L, item1.getId());
        assertEquals(200L, item2.getId());

        // Verify they don't affect each other
        item1.id = 300L;
        assertEquals(300L, item1.getId());
        assertEquals(200L, item2.getId());

        // Test that defensive copy handles null arrays correctly
        SynonymItem item1 = new SynonymItem(1, new String[] { "a" }, new String[] { "x" });

        // Set to null
        item1.setNewInputs(null);
        item1.setNewOutputs(null);

        // Should return null, not crash
        assertNull(item1.getNewInputs());
        assertNull(item1.getNewOutputs());
    }

    description: str
    type: str


class CarItem(BaseItem):
    type: str = "car"


class PlaneItem(BaseItem):
    type: str = "plane"
    size: int


items = {
    "item1": {"description": "All my friends drive a low rider", "type": "car"},
    "item2": {
        "description": "Music is my aeroplane, it's my aeroplane",
        "type": "plane",
        "size": 5,
    },
}

    System.out.println(response.getContentAsString());
}
```

### Asynchronous request

```java
import org.codelibs.curl.Curl;

Curl.post("https://api.example.com/items")
    .body("{\"name\":\"item1\"}")
    .header("Content-Type", "application/json")
    .execute(
        response -> System.out.println("Async status: " + response.getHttpStatusCode()),
        error -> error.printStackTrace());
```

        assertEquals(arr.length, result.length);
        assertEquals(arr[0], result[0]);

        // Test ArrayList
        final List<String> list = new ArrayList<>();
        list.add("item1");
        list.add("item2");
        binary = SerializeUtil.fromObjectToBinary(list);
        @SuppressWarnings("unchecked")
        final List<String> resultList = (List<String>) SerializeUtil.fromBinaryToObject(binary);

    }

    @Test
    public void test_register_nonEntityList() {
        RenderData data = new RenderData();
        List<String> stringList = Arrays.asList("item1", "item2", "item3");

        RenderDataUtil.register(data, "strings", stringList);

        Object result = data.getDataMap().get("strings");