Add failing test for #1388

Author: cowtowncoder

src/test/java/com/fasterxml/jackson/failing/JsonIdentiyInfo1388Test.java

@@ -0,0 +1,87 @@
+package com.fasterxml.jackson.failing;
+
+import java.util.*;
+
+import com.fasterxml.jackson.annotation.*;
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.*;
+
+public class JsonIdentiyInfo1388Test extends BaseMapTest
+{
+    @JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class)
+    public static class NamedThing {
+        private final UUID id;
+        private final String name;
+
+        @JsonCreator
+        public NamedThing(@JsonProperty("id") UUID id, @JsonProperty("name") String name) {
+            this.id = id;
+            this.name = name;
+        }
+
+        public UUID getId() {
+            return id;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            NamedThing that = (NamedThing) o;
+            return that.id.equals(id) && that.name.equals(name);
+        }
+
+        @Override
+        public int hashCode() {
+            return name.hashCode();
+        }
+    }
+
+
+    public void testDeserializationFinalClassJSOG() throws Exception
+    {
+        final ObjectMapper mapper = new ObjectMapper();
+        final UUID id = UUID.fromString("a59aa02c-fe3c-43f8-9b5a-5fe01878a818");
+        final NamedThing thing = new NamedThing(id, "Hello");
+
+        final TypeReference<?> namedThingListType = new TypeReference<List<NamedThing>>() { };
+
+        final String jsog = mapper.writeValueAsString(Arrays.asList(thing, thing, thing));
+        {
+            final List<NamedThing> list = mapper.readValue(jsog, namedThingListType);
+            _assertAllSame(list);
+        }
+
+        // this is the jsog representation of the list of 3 of the same item
+        assertTrue(jsog.equals("[{\"@id\":1,\"id\":\"a59aa02c-fe3c-43f8-9b5a-5fe01878a818\",\"name\":\"Hello\"},1,1]"));
+
+        // now move it around it have forward references
+        final String forwardReferences = "[1,1,{\"@id\":1,\"id\":\"a59aa02c-fe3c-43f8-9b5a-5fe01878a818\",\"name\":\"Hello\"}]";
+        // this works
+        {
+            final List<NamedThing> forward = mapper.readValue(forwardReferences, namedThingListType);
+            _assertAllSame(forward);
+        }
+
+        // now move the @id to be not the first key in the object
+        final String notFirstKey = "[1,1,{\"id\":\"a59aa02c-fe3c-43f8-9b5a-5fe01878a818\",\"name\":\"Hello\",\"@id\":1}]";
+        // this fails
+        {
+            final List<NamedThing> forward = mapper.readValue(notFirstKey, namedThingListType);
+            _assertAllSame(forward);
+        }
+    }
+
+    private void _assertAllSame(List<?> entries) {
+        Object first = entries.get(0);
+        for (int i = 0, end = entries.size(); i < end; ++i) {
+            if (first != entries.get(i)) {
+                fail("Mismatch: entry #"+i+" not same as #0");
+            }
+        }
+    }
+}