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Change Log

Version 2.5

2015-11-24

  • Updated minimum JDK version to 1.6
  • Improved Date Deserialization by accepting many date formats
  • Added support for java.util.Currency, AtomicLong, AtomicLongArray, AtomicInteger, AtomicIntegerArray, AtomicBoolean. This change is backward-incompatible because the earlier version of Gson used the default serialization which wasn't intuitive. We hope that these classes are not used enough to actually cause problems in the field.
  • Improved debugging information when some exceptions are thrown

Version 2.4

2015-10-04

  • Drop IOException from TypeAdapter.toJson(). This is a binary-compatible change, but may cause compiler errors where IOExceptions are being caught but no longer thrown. The correct fix for this problem is to remove the unnecessary catch clause.
  • New: Gson.newJsonWriter method returns configured JsonWriter instances.
  • New: @SerializedName now works with [AutoValue’s][autovalue] abstract property methods.
  • New: @SerializedName permits alternate names when deserializing.
  • New: JsonWriter#jsonValue writes raw JSON values.
  • New: APIs to add primitives directly to JsonArray instances.
  • New: ISO 8601 date type adapter. Find this in extras.
  • Fix: FieldNamingPolicy now works properly when running on a device with a Turkish locale. [autovalue]: https://github.com/google/auto/tree/master/value

Version 2.3.1

2014-11-20

  • Added support to serialize objects with self-referential fields. The self-referential field is set to null in JSON. Previous version of Gson threw a StackOverflowException on encountering any self-referential fields.
    • The most visible impact of this is that Gson can now serialize Throwable (Exception and Error)
  • Added support for @JsonAdapter annotation on enums which are user defined types
  • Fixed bug in getPath() with array of objects and arrays of arrays
  • Other smaller bug fixes

Version 2.3

2014-08-11

  • The new @JsonAdapter annotation to specify a Json TypeAdapter for a class field
  • JsonPath support: JsonReader.getPath() method returns the JsonPath expression
  • New public methods in JsonArray (similar to the java.util.List): contains(JsonElement), remove(JsonElement), remove(int index), set(int index, JsonElement element)
  • Many other smaller bug fixes

Version 2.2.4

2013-05-13

  • Fix internal map (LinkedHashTreeMap) hashing bug.
  • Bug fix (Issue 511)

Version 2.2.3

2013-04-12

  • Fixes for possible DoS attack due to poor String hashing

Version 2.2.2

2012-07-02

  • Gson now allows a user to override default type adapters for Primitives and Strings. This behavior was allowed in earlier versions of Gson but was prohibited started Gson 2.0. We decided to allow it again: This enables a user to parse 1/0 as boolean values for compatibility with iOS JSON libraries.
  • (Incompatible behavior change in JsonParser): In the past, if JsonParser encountered a stream that terminated prematurely, it returned JsonNull. This behavior wasn't correct because the stream had invalid JSON, not a null. JsonParser is now changed to throw JsonSyntaxException in this case. Note that if JsonParser (or Gson) encounter an empty stream, they still return JsonNull.

Version 2.2.1

2012-05-05

  • Very minor fixes

Version 2.2

2012-05-05

  • Added getDelegateAdapter in Gson class
  • Fixed a security bug related to denial of service attack with Java HashMap String collisions.

Version 2.1

2011-12-30 (Targeted Dec 31, 2011)

  • Support for user-defined streaming type adapters
  • continued performance enhancements
  • Dropped support for type hierarchy instance creators. We don't expect this to be a problem. We'll also detect fewer errors where multiple type adapters can serialize the same type. With APIs like getNextTypeAdapter, this might actually be an improvement!

Version 2.0

2011-11-13 Faster

  • Previous versions first parsed complete document into a DOM-style model (JsonObject or JsonArray) and then bound data against that. Gson 2 does data binding directly from the stream parser.

More Predictable

  • Objects are serialized and deserialized in the same way, regardless of where they occur in the object graph.

Changes to watch out for

  • Gson 1.7 would serialize top-level nulls as "". 2.0 serializes them as "null".
String json = gson.toJson(null, Foo.class);
1.7: json == ""
2.0: json == "null"

Gson 1.7 permitted duplicate map keys. 2.0 forbids them.

String json = "{'a':1,'a':2}";
Map<String, Integer> map = gson.fromJson(json, mapType);
1.7: map == {a=2}
2.0: JsonSyntaxException thrown

Gson 1.7 won’t serialize subclass fields in collection elements. 2.0 adds this extra information.

List<Point2d> points = new ArrayList<Point2d>();
points.add(new Point3d(1, 2, 3));
String json = gson.toJson(points, 
    new TypeToken<List<Point2d>>() {}.getType());
1.7: json == "[{'x':1,'y':2}]"
2.0: json == "[{'x':1,'y':2,'z':3}]"

Gson 1.7 binds single-element arrays as their contents. 2.0 doesn’t.

Integer i = gson.fromJson("[42]", Integer.class);
1.7: i == 42
2.0: JsonSyntaxException thrown

Other changes to be aware of

  • Gson 2.0 doesn’t support type adapters for primitive types.
  • Gson 1.7 uses arbitrary precision for primitive type conversion (so -122.08e-2132 != 0). Gson 2.0 uses double precision (so -122.08e-2132 == 0).
  • Gson 1.7 sets subclass fields when an InstanceCreator returns a subclass when the value is a field of another object. Gson 2.0 sets fields of the requested type only.
  • Gson 1.7 versioning never skips the top-level object. Gson 2.0 versioning applies to all objects.
  • Gson 1.7 truncates oversized large integers. Gson 2.0 fails on them.
  • Gson 2.0 permits integers to have .0 fractions like "1.0".
  • Gson 1.7 throws IllegalStateException on circular references. Gson 2.0 lets the runtime throw a StackOverflowError.

Version 1.7.2

2011-09-30 (Unplanned release)

  • Fixed a threading issue in FieldAttributes (Issue 354)

Version 1.7.1

2011-04-13 (Unplanned release)

  • Fixed Gson jars in Maven Central repository
  • Removed assembly-descriptor.xml and maven pom.xml/pom.properties files from Gson binary jar. This also ensures that jarjar can be run correctly on Gson.

Version 1.7

2011-04-12 (Targeted: Jan 2011)

  • No need to define no-args constructors for classes serialized with Gson
  • Ability to register a hierarchical type adapter
  • Support for serialization and deserialization of maps with complex keys
  • Serialization and deserialization specific exclusion strategies
  • Allow concrete data structure fields without type adapters
  • Fixes "type" management (i.e. Wildcards, etc.)
  • Major performance enhancements by reducing the need for Java reflection See detailed announcement at this thread in the Gson Google Group.

Version 1.6

2010-11-24 (Targeted: Oct, 2010)

  • New stream parser APIs
  • New parser that improves parsing performance significantly

Version 1.5

2010-08-19 (Target Date: Aug 18, 2010)

  • Added UPPER_CAMEL_CASE_WITH_SPACES naming policy
  • Added SQL date and time support
  • A number of performance improvements: Using caching of field annotations for speeding up reflection, replacing recursive calls in the parser with a for loop.

Version 1.4 BETA

2009_10_09

  • JsonStreamParser: A streaming parser API class to deserialize multiple JSON objects on a stream (such as a pipelined HTTP response)
  • Raised the deserialization limit for byte and object arrays and collection to over 11MB from 80KB. See issue 96.
  • While serializing, Gson now uses the actual type of a field. This allows serialization of base-class references holding sub-classes to the JSON for the sub-class. It also allows serialization of raw collections. See Issue 155, 156.
  • Added a Gson.toJsonTree() method that serializes a Java object to a tree of JsonElements. See issue 110.
  • Added a Gson.fromJson(JsonElement) method that deserializes from a Json parse tree.
  • Updated Expose annotation to contain parameters serialize and deserialize to control whether a field gets serialized or deserialized. See issue 146.
  • Added a new naming policy LOWER_CASE_WITH_DASHES
  • Default date type adapter is now thread-safe. See Issue 162.
  • JsonElement.toString() now outputs valid JSON after escaping characters properly. See issue 154.
  • JsonPrimitive.equals() now returns true for two numbers if their values are equal. All integral types (long, int, short, byte, BigDecimal, Long, Integer, Short, Byte) are treated equivalent for comparison. Similarly, floating point types (double, float, BigDecimal, Double, Float) are treated equivalent as well. See issue 147.
  • Fixed bugs in pretty printing. See issue 153.
  • If a field causes circular reference error, Gson lists the field name instead of the object value. See issue 118.
  • Gson now serializes a list with null elements correctly. See issue 117.
  • Fixed issue 121, 123, 126.
  • Support user defined exclusion strategies (Feature Request 138).

Version 1.3

2009-04-01

  • Fix security token to remove the <data> element.
  • Changed JsonParser.parse method to be non-static
  • Throw JsonParseExceptions instead of ClassCastExceptions and UnsupportedOperationExceptions

Version 1.3 beta3

2009-03-17

  • Supported custom mapping of field names by making FieldNamingStrategy public and allowing FieldNamingStrategy to be set in GsonBuilder. See issue 104.
  • Added a new GsonBuilder setting generateNonExecutableJson() that prefixes the generated JSON with some text to make the output non-executable Javascript. Gson now recognizes this text from input while deserializing and filters it out. This feature is meant to prevent script sourcing attacks. See Issue 42.
  • Supported deserialization of sets with elements that do not implement Comparable. See Issue 100
  • Supported deserialization of floating point numbers without a sign after E. See Issue 94

Version 1.3 beta2

2009-02-05

  • Added a new Parser API. See issue 65
  • Supported deserialization of java.util.Properties. See Issue 87
  • Fixed the pretty printing of maps. See Issue 93
  • Supported automatic conversion of strings into numeric and boolean types if possible. See Issue 89
  • Supported deserialization of longs into strings. See Issue 82

Version 1.3 beta1

2009_01 (Target Date Friday, Dec 15, 2008)

  • Made JSON parser lenient by allowing unquoted member names while parsing. See Issue 41
  • Better precision handling for floating points. See Issue 71, 72
  • Support for deserialization of special double values: NaN, infinity and negative infinity. See Issue 81
  • Backward compatibility issue found with serialization of Collection