Added a test for #37, noting fix requires 2.3.3 of jackson-databind

Author: cowtowncoder

pom.xml

@@ -29,7 +29,7 @@ Guava (http://code.google.com/p/guava-libraries/) types (currently mostly just c
   </contributors>
 
   <properties>
-    <version.jackson>2.3.2</version.jackson>
+    <version.jackson>2.3.3-SNAPSHOT</version.jackson>
 
     <!-- Generate PackageVersion.java into this directory. -->
     <packageVersion.dir>com/fasterxml/jackson/datatype/guava</packageVersion.dir>

release-notes/VERSION

@@ -1,6 +1,8 @@
 Project: jackson-datatype-guava
 Version: 2.3.3 (xx-xxx-2014)
 
+#37: `Optional` not correctly deserialized from JSON null, if inside a Collection
+ (reported by JYang-Addepar@github)
 #41: `Multimap` serializer does not honor @JsonInclude(JsonInclude.Include.NON_EMPTY) 
  (reported by Olve S-H)
 

src/main/java/com/fasterxml/jackson/datatype/guava/deser/GuavaOptionalDeserializer.java

@@ -91,7 +91,7 @@ public Optional<?> deserialize(JsonParser jp, DeserializationContext ctxt) throw
             JsonProcessingException
     {
         Object refd;
-        
+
         if (_valueTypeDeserializer == null) {
             refd = _valueDeserializer.deserialize(jp, ctxt);
         } else {
@@ -119,7 +119,6 @@ public Optional<?> deserializeWithType(JsonParser jp, DeserializationContext ctx
             return deserialize(jp, ctxt);
         }
         // with type deserializer to use here? Looks like we get passed same one?
-        Object ref = typeDeserializer.deserializeTypedFromAny(jp, ctxt);
-        return Optional.of(ref);
+        return Optional.of(typeDeserializer.deserializeTypedFromAny(jp, ctxt));
     }
 }

src/test/java/com/fasterxml/jackson/datatype/guava/TestOptional.java

@@ -1,8 +1,9 @@
 package com.fasterxml.jackson.datatype.guava;
 
+import java.util.*;
+
 import com.fasterxml.jackson.annotation.*;
 import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
-import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 
 import com.fasterxml.jackson.core.type.TypeReference;
 
@@ -37,7 +38,7 @@ public void link(Unit u) {
             baseUnit = Optional.of(u);
         }
     }
-    
+
     /*
     /**********************************************************************
     /* Test methods
@@ -137,7 +138,7 @@ public void testWithTypingEnabled() throws Exception
 		assertEquals(myData.myString, deserializedMyData.myString);
     }
 
-    // for [Issue#17]
+    // [Issue#17]
     public void testObjectId() throws Exception
     {
         final Unit input = new Unit();
@@ -150,4 +151,26 @@ public void testObjectId() throws Exception
         Unit base = result.baseUnit.get();
         assertSame(result, base);
     }
+
+    // [Issue#37]
+    public void testOptionalCollection() throws Exception {
+        ObjectMapper mapper = new ObjectMapper().registerModule(new GuavaModule());
+
+        TypeReference<List<Optional<String>>> typeReference =
+            new TypeReference<List<Optional<String>>>() {};
+
+        List<Optional<String>> list = new ArrayList<Optional<String>>();
+        list.add(Optional.of("2014-1-22"));
+        list.add(Optional.<String>absent());
+        list.add(Optional.of("2014-1-23"));
+
+        String str = mapper.writeValueAsString(list);
+        assertEquals("[\"2014-1-22\",null,\"2014-1-23\"]", str);
+
+        List<Optional<String>> result = mapper.readValue(str, typeReference);
+        assertEquals(list.size(), result.size());
+        for (int i = 0; i < list.size(); ++i) {
+            assertEquals("Entry #"+i, list.get(i), result.get(i));
+        }
+    }
 }