Fix #1473

Author: cowtowncoder

release-notes/VERSION

@@ -16,6 +16,7 @@ Project: jackson-databind
 #1453: `UntypedObjectDeserializer` does not retain `float` type (over `double`)
 #1456: `TypeFactory` type resolution broken in 2.7 for generic types
    when using `constructType` with context
+#1473: Add explicit deserializer for `StringBuilder` due to Java 9 changes
 
 2.8.5 (14-Nov-2016)
 

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

@@ -41,6 +41,7 @@ public static Class<?>[] types() {
             TimeZone.class,
             InetAddress.class,
             InetSocketAddress.class,
+            StringBuilder.class,
         };
     }
 
@@ -85,6 +86,8 @@ public static Std findDeserializer(Class<?> rawType)
             kind = Std.STD_INET_ADDRESS;
         } else if (rawType == InetSocketAddress.class) {
             kind = Std.STD_INET_SOCKET_ADDRESS;
+        } else if (rawType == StringBuilder.class) {
+            kind = Std.STD_STRING_BUILDER;
         } else {
             return null;
         }
@@ -199,6 +202,7 @@ public static class Std extends FromStringDeserializer<Object>
         public final static int STD_TIME_ZONE = 10;
         public final static int STD_INET_ADDRESS = 11;
         public final static int STD_INET_SOCKET_ADDRESS = 12;
+        public final static int STD_STRING_BUILDER = 13;
 
         protected final int _kind;
 
@@ -276,6 +280,8 @@ protected Object _deserialize(String value, DeserializationContext ctxt) throws
                 }
                 // host or unbracketed IPv6, without port number
                 return new InetSocketAddress(value, 0);
+            case STD_STRING_BUILDER:
+                return new StringBuilder(value);
             }
             throw new IllegalArgumentException();
         }
@@ -290,10 +296,12 @@ protected Object _deserializeFromEmptyString() throws IOException {
             if (_kind == STD_LOCALE) {
                 return Locale.ROOT;
             }
+            if (_kind == STD_STRING_BUILDER) {
+                return new StringBuilder();
+            }
             return super._deserializeFromEmptyString();
         }
 
-
         protected int _firstHyphenOrUnderscore(String str)
         {
             for (int i = 0, end = str.length(); i < end; ++i) {