Backport #1868 fix

Author: cowtowncoder

release-notes/VERSION-2.x

@@ -10,6 +10,8 @@ Project: jackson-databind
 #1854: NPE deserializing collection with `@JsonCreator` and `ACCEPT_CASE_INSENSITIVE_PROPERTIES`
  (reported by rue-jw@github)
 #1855: Blacklist for more serialization gadgets (dbcp/tomcat, spring)
+#1868: Class name handling for JDK unmodifiable Collection types changed
+  (reported by Rob W)
 
 2.9.3 (09-Dec-2017)
 

src/main/java/com/fasterxml/jackson/databind/deser/BuilderBasedDeserializer.java

@@ -165,7 +165,7 @@ public Boolean supportsUpdate(DeserializationConfig config) {
     /**********************************************************
      */
 
-    protected final Object finishBuild(DeserializationContext ctxt, Object builder)
+    protected Object finishBuild(DeserializationContext ctxt, Object builder)
             throws IOException
     {
         // As per [databind#777], allow returning builder itself
@@ -183,7 +183,7 @@ protected final Object finishBuild(DeserializationContext ctxt, Object builder)
      * Main deserialization method for bean-based objects (POJOs).
      */
     @Override
-    public final Object deserialize(JsonParser p, DeserializationContext ctxt)
+    public Object deserialize(JsonParser p, DeserializationContext ctxt)
         throws IOException
     {
         // common case first:
@@ -334,7 +334,7 @@ public Object deserializeFromObject(JsonParser p, DeserializationContext ctxt)
      */
     @Override
     @SuppressWarnings("resource")
-    protected final Object _deserializeUsingPropertyBased(final JsonParser p,
+    protected Object _deserializeUsingPropertyBased(final JsonParser p,
             final DeserializationContext ctxt)
         throws IOException
     { 

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

@@ -134,8 +134,7 @@ private static boolean isJavaUtilCollectionClass(String clz, String type)
         if (clz.startsWith("Collections$")) {
             // 02-Jan-2017, tatu: As per [databind#1868], may need to leave Unmodifiable variants as is
             return (clz.indexOf(type) > 0)
-//                    && !clz.contains("Unmodifiable");
-                    ;
+                    && !clz.contains("Unmodifiable");
         }
         if (clz.startsWith("Arrays$")) {
             return (clz.indexOf(type) > 0);

src/test/java/com/fasterxml/jackson/databind/deser/jdk/JDKCollectionsDeserTest.java

@@ -46,8 +46,7 @@ public void testSingletonCollections() throws Exception
         assertEquals(28, result.iterator().next().x);
     }
 
-    // [databind#1868]: Not sure if this should or should not pass...
-    /*
+    // [databind#1868]: Verify class name serialized as is
     public void testUnmodifiableSet() throws Exception
     {
         ObjectMapper mapper = new ObjectMapper();
@@ -58,10 +57,15 @@ public void testUnmodifiableSet() throws Exception
 
         assertEquals("[\"java.util.Collections$UnmodifiableSet\",[\"a\"]]", json);
 
-        // and back...
+        // 04-Jan-2018, tatu: Alas, no way to make this actually work well, at this point.
+         //   In theory could jiggle things back on deser, using one of two ways:
+         //
+         //   1) Do mapping to regular Set/List types (abstract type mapping): would work, but get rid of immutability
+         //   2) Have actually separate deserializer OR ValueInstantiator
+        /*
         Set<String> result = mapper.readValue(json, Set.class);
         assertNotNull(result);
         assertEquals(1, result.size());
+        */
     }
-    */
 }