...

Author: cowtowncoder

src/main/java/com/fasterxml/jackson/databind/ObjectMapper.java

@@ -2393,9 +2393,7 @@ public <T> T readValue(JsonParser p, JavaType valueType)
     public <T extends TreeNode> T readTree(JsonParser p)
         throws IOException, JsonProcessingException
     {
-        /* 05-Aug-2011, tatu: Also, must check for EOF here before
-         *   calling readValue(), since that'll choke on it otherwise
-         */
+        // Must check for EOF here before calling readValue(), since that'll choke on it otherwise
         DeserializationConfig cfg = getDeserializationConfig();
         JsonToken t = p.getCurrentToken();
         if (t == null) {
@@ -2404,17 +2402,13 @@ public <T extends TreeNode> T readTree(JsonParser p)
                 return null;
             }
         }
+        // NOTE! _readValue() will check for trailing tokens
         JsonNode n = (JsonNode) _readValue(cfg, p, JSON_NODE_TYPE);
         if (n == null) {
             n = getNodeFactory().nullNode();
         }
         @SuppressWarnings("unchecked")
         T result = (T) n;
-        /*
-        if (cfg.isEnabled(DeserializationFeature.FAIL_ON_TRAILING_TOKENS)) {
-            _verifyNoTrailingTokens(p, ctxt, valueType);
-        }
-*/
         return result;
     }
 
@@ -4029,14 +4023,13 @@ protected JsonNode _readTreeAndClose(JsonParser p0) throws IOException
             } else {
                 ctxt = createDeserializationContext(p, cfg);
                 JsonDeserializer<Object> deser = _findRootDeserializer(ctxt, valueType);
-                Object result;
                 if (cfg.useRootWrapping()) {
                     resultNode = (JsonNode) _unwrapAndDeserialize(p, ctxt, cfg, valueType, deser);
                 } else {
                     resultNode = (JsonNode) deser.deserialize(p, ctxt);
                 }
             }
-            if (cfg.isEnabled(DeserializationFeature.FAIL_ON_TRAILING_TOKENS)) {
+            if (checkTrailing) {
                 _verifyNoTrailingTokens(p, ctxt, valueType);
             }
             // No ObjectIds so can ignore

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

@@ -89,8 +89,7 @@ public void testNullFromEOFWithParserAndReader() throws Exception
             _assertNullTree(MAPPER.reader().readTree(p));
         }
     }
-    */
-
+*/
     // [databind#2211]: when passing content sources OTHER than `JsonParser`,
     // return "missing node" instead of alternate (return `null`, throw exception).
     public void testMissingNodeForEOFOtherMapper() throws Exception

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

@@ -14,6 +14,8 @@
  */
 public class TreeReadViaMapperTest extends BaseMapTest
 {
+    private final ObjectMapper MAPPER = objectMapper();
+
     public void testSimple() throws Exception
     {
         final String JSON = SAMPLE_DOC_JSON_SPEC;
@@ -22,9 +24,9 @@ public void testSimple() throws Exception
             JsonNode result;
 
             if (type == 0) {
-                result = objectMapper().readTree(new StringReader(JSON));
+                result = MAPPER.readTree(new StringReader(JSON));
             } else {
-                result = objectMapper().readTree(JSON);
+                result = MAPPER.readTree(JSON);
             }
 
             assertType(result, ObjectNode.class);
@@ -90,9 +92,8 @@ public void testSimple() throws Exception
 
     public void testMixed() throws IOException
     {
-        ObjectMapper om = new ObjectMapper();
         String JSON = "{\"node\" : { \"a\" : 3 }, \"x\" : 9 }";
-        Bean bean = om.readValue(JSON, Bean.class);
+        Bean bean = MAPPER.readValue(JSON, Bean.class);
 
         assertEquals(9, bean._x);
         JsonNode n = bean._node;
@@ -115,15 +116,26 @@ public void testEOF() throws Exception
             ;
         JsonFactory jf = new JsonFactory();
         JsonParser p = jf.createParser(new StringReader(JSON));
-        JsonNode result = objectMapper().readTree(p);
+        JsonNode result = MAPPER.readTree(p);
 
         assertTrue(result.isObject());
         assertEquals(4, result.size());
 
-        assertNull(objectMapper().readTree(p));
+        assertNull(MAPPER.readTree(p));
         p.close();
     }
 
+    public void testNullViaParser() throws Exception
+    {
+        final String JSON = " null ";
+        JsonFactory jf = new JsonFactory();
+
+        try (JsonParser p = jf.createParser(new StringReader(JSON))) {
+            final JsonNode result = MAPPER.readTree(p);
+            assertTrue(result.isNull());
+        }
+    }
+
     public void testMultiple() throws Exception
     {
         String JSON = "12  \"string\" [ 1, 2, 3 ]";