Adding reproduction test case for #1298

Author: JeffQuandt

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

@@ -0,0 +1,96 @@
+package com.fasterxml.jackson.failing;
+
+import com.fasterxml.jackson.annotation.*;
+import com.fasterxml.jackson.core.JsonEncoding;
+import com.fasterxml.jackson.core.json.UTF8JsonGenerator;
+import com.fasterxml.jackson.databind.BaseMapTest;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.ObjectWriter;
+
+import java.io.ByteArrayOutputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+// Test case for https://github.com/FasterXML/jackson-databind/issues/1298
+public class TestObjectIdWithUnwrappingBeanPropertyWriter extends BaseMapTest
+{
+
+        private static Long id = 1L;
+
+        public static final class ListOfParents{
+            @JsonUnwrapped
+            public List<Parent> parents = new ArrayList<>();
+
+            public void addParent( Parent parent) { parents.add(parent);}
+        }
+
+        @JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id", scope = Parent.class)
+        public static final class Parent {
+
+            public Long id;
+
+            @JsonUnwrapped
+            public Child child;
+            public Parent() { this.id = TestObjectIdWithUnwrappingBeanPropertyWriter.id++;}
+
+        }
+
+        @JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id", scope = Child.class)
+        public static final class Child {
+
+            public Long id;
+
+            @JsonProperty
+            private final String name;
+
+            public Child(@JsonProperty("name") String name) {
+                this.name = name;
+                this.id = TestObjectIdWithUnwrappingBeanPropertyWriter.id++;
+            }
+        }
+
+        public void testObjectIdWithRepeatedChild() throws Exception
+        {
+            ObjectMapper mapper = new ObjectMapper();
+            ObjectWriter writer = mapper.writer();
+
+            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+
+            UTF8JsonGenerator generator = (UTF8JsonGenerator) mapper.getFactory().createGenerator(outputStream, JsonEncoding.UTF8);
+
+            // Equivalent to Spring _embedded for Bean w/ List property
+            ListOfParents parents = new ListOfParents();
+
+            //Bean with Relationship
+            Parent parent1 = new Parent();
+            Child child1 = new Child("Child1");
+            parent1.child = child1;
+
+            // Bean with Relationship
+            Parent parent2 = new Parent();
+            Child child2 = new Child( "Child2");
+            parent2.child = child2;
+
+            // Bean w/ repeated relationship from parent1, should generate ObjectId
+            Parent parent3 = new Parent();
+            parent3.child = child1;
+
+
+            parents.addParent(parent1);
+            parents.addParent(parent2);
+
+            String json;
+            // serialize parent1 and parent2
+            writer.writeValue(generator, parents);
+            json = outputStream.toString();
+            outputStream.reset();
+            System.out.println("This works: " + json);
+
+            // Add parent3 to create ObjectId reference
+            parents.addParent(parent3);
+
+            writer.writeValue(generator, parents);
+            json = outputStream.toString();
+            System.out.println("This fails: " + json);
+        }
+}