backport #346 fix for 2.2.4

Author: cowtowncoder

src/main/java/com/fasterxml/jackson/databind/deser/std/JsonNodeDeserializer.java

@@ -255,6 +255,7 @@ protected final JsonNode deserializeAny(JsonParser jp, DeserializationContext ct
     {
         switch (jp.getCurrentToken()) {
         case START_OBJECT:
+        case END_OBJECT: // for empty JSON Objects we may point to this
             return deserializeObject(jp, ctxt, nodeFactory);
 
         case START_ARRAY:

src/test/java/com/fasterxml/jackson/databind/node/TestObjectNode.java

@@ -3,16 +3,56 @@
 import java.math.BigDecimal;
 import java.util.*;
 
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.databind.*;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 
 /**
  * Additional tests for {@link ObjectNode} container class.
  */
 public class TestObjectNode
     extends BaseMapTest
 {
-    private final ObjectMapper MAPPER = new ObjectMapper();
+    @JsonDeserialize(as = DataImpl.class)
+    public interface Data {
+    }
+
+    public static class DataImpl implements Data
+    {
+        protected JsonNode root;
+
+        @JsonCreator
+        public DataImpl(JsonNode n) {
+            root = n;
+        }
+        
+        @JsonValue
+        public JsonNode value() { return root; }
+        
+        /*
+        public Wrapper(ObjectNode n) { root = n; }
+        
+        @JsonValue
+        public ObjectNode value() { return root; }
+        */
+    }
+    
+    /*
+    /**********************************************************
+    /* Test methods
+    /**********************************************************
+     */
+    
+    private final ObjectMapper MAPPER = objectMapper();
 
+    // for [Issue#346]
+    public void testEmptyNodeAsValue() throws Exception
+    {
+        Data w = MAPPER.readValue("{}", Data.class);
+        assertNotNull(w);
+    }
+    
     public void testBasics()
     {
         ObjectNode n = new ObjectNode(JsonNodeFactory.instance);