Add release note entry for #2467

Author: cowtowncoder

release-notes/CREDITS-2.x

@@ -963,3 +963,8 @@ David Connelly (dconnelly@github)
 Wahey (KevynBct@github)
   * Reported #2466: Didn't find class "java.nio.file.Path" below Android api 26
   (2.10.0)
+
+Martín Coll (colltoaction@github)
+  * Contributed #2467: Accept `JsonTypeInfo.As.WRAPPER_ARRAY` with no second argument to
+   deserialize as "null value"
+  (2.10.0)

release-notes/VERSION-2.x

@@ -8,6 +8,9 @@ Project: jackson-databind
 
 #2466: Didn't find class "java.nio.file.Path" below Android api 26
  (reported by KevynBct@github)
+#2467: Accept `JsonTypeInfo.As.WRAPPER_ARRAY` with no second argument to
+  deserialize as "null value"
+ (contributed by Martin C)
 
 2.10.0.pr3 (17-Sep-2019)
 

src/main/java/com/fasterxml/jackson/databind/jsontype/impl/AsArrayTypeDeserializer.java

@@ -113,6 +113,7 @@ protected Object _deserialize(JsonParser p, DeserializationContext ctxt) throws
             p = JsonParserSequence.createFlattened(false, tb.asParser(p), p);
             p.nextToken();
         }
+        // [databind#2467] (2.10): Allow missing value to be taken as "just use null value"
         if (hadStartArray && p.currentToken() == JsonToken.END_ARRAY) {
             return deser.getNullValue(ctxt);
         }

src/test/java/com/fasterxml/jackson/databind/jsontype/TestTypedDeserialization.java

@@ -57,7 +57,7 @@ public Cat(@JsonProperty("furColor") String c) {
         public void setName(String n) { name = n; }
     }
 
-    // for [JACKSON-319] -- allow "empty" beans
+    // Allow "empty" beans
     @JsonTypeName("fishy")
     static class Fish extends Animal
     {
@@ -68,6 +68,7 @@ public Fish()
         }
     }
 
+    // [databind#2467]: Allow missing "content" for as-array deserialization
     @JsonDeserialize(using = NullAnimalDeserializer.class)
     static class NullAnimal extends Animal
     {
@@ -264,6 +265,7 @@ public void testIssue506WithNumber() throws Exception
         assertEquals(input.number, output.number);
     }
 
+    // [databind#2467]: Allow missing "content" for as-array deserialization
     public void testTypeAsArrayWithNullableType() throws Exception
     {
         ObjectMapper m = new ObjectMapper();
@@ -273,6 +275,7 @@ public void testTypeAsArrayWithNullableType() throws Exception
         assertNull(a);
     }
 
+    // [databind#2467]
     public void testTypeAsArrayWithCustomDeserializer() throws Exception
     {
         ObjectMapper m = new ObjectMapper();