Add a test for #676

Author: lunaticare

src/test/java/com/fasterxml/jackson/failing/TestPolymorphicDeserialization676.java

@@ -0,0 +1,149 @@
+package com.fasterxml.jackson.failing;
+
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.databind.BaseMapTest;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializationFeature;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Reproduction of [https://github.com/FasterXML/jackson-databind/issues/676]
+ * <p/>
+ * Deserialization of class with generic collection inside
+ * depends on how is was deserialized first time.
+ */
+public class TestPolymorphicDeserialization676 extends BaseMapTest {
+	private static final int TIMESTAMP = 123456;
+	private final MapContainer originMap;
+
+	public TestPolymorphicDeserialization676() {
+		Map<String, Object> localMap = new HashMap<String, Object>();
+		localMap.put("DateValue", new Date(TIMESTAMP));
+		originMap = new MapContainer(localMap);
+	}
+
+	/**
+	 * If the class was first deserialized as polymorphic field,
+	 * deserialization will fail at complex type.
+	 */
+	public void testDeSerFail() throws IOException {
+		ObjectMapper mapper = new ObjectMapper();
+
+		MapContainer deserMapBad = createDeSerMapContainer(originMap, mapper);
+
+		// map is deserialized as list
+		List<Object> list = Arrays.asList(new Object[] {"java.util.Date", TIMESTAMP});
+		assertFalse(list.equals(deserMapBad.getMap().get("DateValue")));
+		assertTrue(originMap.equals(deserMapBad));
+		assertTrue(originMap.equals(mapper.readValue(mapper.writeValueAsString(originMap),
+				MapContainer.class)));
+	}
+
+	/**
+	 * If the class was first deserialized as is,
+	 * deserialization will work correctly.
+	 */
+	public void testDeSerCorrect() throws IOException {
+		ObjectMapper mapper = new ObjectMapper();
+		mapper.enable(SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS);
+		Map<String, Object> map = new HashMap<String, Object>();
+		map.put("1", 1);
+		// commenting out the following statement will fail the test
+		assertEquals(new MapContainer(map),
+				mapper.readValue(
+						mapper.writeValueAsString(new MapContainer(map)),
+						MapContainer.class));
+
+		MapContainer deserMapGood = createDeSerMapContainer(originMap, mapper);
+
+		assertEquals(originMap, deserMapGood);
+		assertEquals(new Date(TIMESTAMP), deserMapGood.getMap().get("DateValue"));
+
+		assertEquals(originMap, mapper.readValue(mapper.writeValueAsString(originMap), MapContainer.class));
+	}
+
+	private static MapContainer createDeSerMapContainer(MapContainer originMap, ObjectMapper mapper) throws IOException {
+		PolymorphicValueWrapper result = new PolymorphicValueWrapper();
+		result.setValue(originMap);
+		String json = mapper.writeValueAsString(result);
+		assertEquals("{\"value\":{\"@class\":"
+						+ "\"com.fasterxml.jackson.failing.TestPolymorphicDeserialization676$MapContainer\","
+						+ "\"map\":{\"DateValue\":[\"java.util.Date\",123456]}}}",
+				json);
+		PolymorphicValueWrapper deserializedResult = mapper.readValue(json, PolymorphicValueWrapper.class);
+		return (MapContainer) deserializedResult.getValue();
+	}
+
+	@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
+	public static class MapContainer {
+		@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS,
+				include = JsonTypeInfo.As.PROPERTY,
+				property = "@class")
+		private Map<String, Object> map;
+
+		@SuppressWarnings("unused")
+		public MapContainer() {
+		}
+
+		public MapContainer(Map<String, Object> map) {
+			this.map = map;
+		}
+
+		public Map<String, Object> getMap() {
+			return map;
+		}
+
+		public void setMap(Map<String, Object> map) {
+			this.map = map;
+		}
+
+		@Override
+		public boolean equals(Object o) {
+			if (this == o) {
+				return true;
+			}
+			if (o == null || getClass() != o.getClass()) {
+				return false;
+			}
+
+			MapContainer that = (MapContainer) o;
+
+			return !(map != null ? !map.equals(that.map) : that.map != null);
+		}
+
+		@Override
+		public int hashCode() {
+			return map != null ? map.hashCode() : 0;
+		}
+
+		@Override
+		public String toString() {
+			return "MapContainer{" +
+					"map=" + map +
+					'}';
+		}
+	}
+
+	@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
+	public static class PolymorphicValueWrapper {
+		@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS,
+				include = JsonTypeInfo.As.PROPERTY,
+				property = "@class")
+		private Object value;
+
+		public Object getValue() {
+			return value;
+		}
+
+		public void setValue(Object value) {
+			this.value = value;
+		}
+	}
+}