Fix #63

Author: cowtowncoder

jr-objects/src/main/java/com/fasterxml/jackson/jr/ob/JSON.java

@@ -257,8 +257,7 @@ public enum Feature
         *
         * @since 2.8 (enabled by default since 2.10)
         */
-       USE_FIELDS(false, true),
-       
+       USE_FIELDS(true, true),
        ;
 
        /*

jr-objects/src/main/java/com/fasterxml/jackson/jr/ob/impl/ArrayReader.java

@@ -26,7 +26,8 @@ public Object readNext(JSONReader r, JsonParser p) throws IOException {
             if (p.hasToken(JsonToken.VALUE_NULL)) {
                 return null;
             }
-            throw JSONObjectException.from(p, "Unexpected token "+p.getCurrentToken()+"; should get START_ARRAY");
+            throw JSONObjectException.from(p, "Unexpected token %s; should get START_ARRAY",
+                    p.getCurrentToken());
         }
 
         CollectionBuilder b = r._collectionBuilder(null);
@@ -60,4 +61,4 @@ public Object read(JSONReader r, JsonParser p) throws IOException {
         } while (p.nextToken() != JsonToken.END_ARRAY);
         return b.buildArray(_elementType);
     }
-}
+}

jr-objects/src/main/java/com/fasterxml/jackson/jr/ob/impl/ValueReaderLocator.java

@@ -172,7 +172,7 @@ protected ValueReader collectionReader(Class<?> collectionType, ResolvedType val
             List<ResolvedType> params = valueType.typeParametersFor(Map.class);
             valueReader = mapReader(rawValueType, params.get(1));
         } else {
-            valueReader = createReader(null, rawValueType, rawValueType);
+            valueReader = findReader(rawValueType);
         }
         return new CollectionReader(collectionType, valueReader);
     }
@@ -195,7 +195,7 @@ protected ValueReader mapReader(Class<?> mapType, ResolvedType valueType)
             List<ResolvedType> params = valueType.typeParametersFor(Map.class);
             valueReader = mapReader(rawValueType, params.get(1));
         } else {
-            valueReader = createReader(null, rawValueType, rawValueType);
+            valueReader = findReader(rawValueType);
         }
         return new MapReader(mapType, valueReader);
     }

jr-objects/src/test/java/com/fasterxml/jackson/jr/ob/SimpleFieldTest.java

@@ -18,8 +18,16 @@ protected XY() { }
         public void setY(int value) { y = value; }
     }
 
-    public void testDefaulSettings() {
-        assertFalse(JSON.std.isEnabled(JSON.Feature.USE_FIELDS));
+    public void testDefaultSettings() {
+        // Changed in 2.10
+        assertTrue(JSON.std.isEnabled(JSON.Feature.USE_FIELDS));
+    }
+
+    public void testSerializeWithoutField() throws Exception
+    {
+        String json = JSON.std.without(JSON.Feature.USE_FIELDS)
+                .asString(new XY(1, 2));
+        assertEquals(aposToQuotes("{'y':2}"), json);
     }
 
     public void testSerializeWithField() throws Exception

jr-objects/src/test/java/com/fasterxml/jackson/jr/ob/WriteBeansTest.java

@@ -22,14 +22,14 @@ public byte[] getStuff() {
     }
 
     static class BeanBase {
-        public int _value;
+        int _value;
 
         public int getValue() { return _value; }
         public void setValue(int v) { _value = v; }
     }
 
     static class BaseImpl extends BeanBase {
-        public int _extra;
+        int _extra;
 
         protected BaseImpl() { }
         public BaseImpl(int v, int x) {

release-notes/VERSION-2.x

@@ -6,7 +6,7 @@ Project: jackson-jr
 
 2.10.0 (not yet released)
 
-No changes since 2.9
+#63: Change default for `JSON.Feature.USE_FIELDS` to `true` (from false) in 2.10
 
 2.9.9 (not yet released)