Jackson Release 2.6

Version 2.6.0 was released July 17th, 2015. It is a "minor" release following 2.5, meaning that it adds new functionality but be backwards compatible with earlier 2.x releases.

New Modules

This version introduced 2 new FasterXML-maintained standard modules:

Protobuf data format module for handling Protocol Buffers encoded data
OSGi module for injecting helper objects (via @JacksonInject) using OSGi registry

Patches

Beyond initial 2.6.0 (described here), following patch releases have been made or are planned:

2.6.1 (09-Aug-2015)
2.6.2 (15-Sep-2015)
2.6.3 (12-Oct-2015)
2.6.4 (not yet released)

Changes: compatibility

No changes to JDK requirements or baseline requirements/supports for external platforms (like Android or Scala versions)

Changes, core

Annotations

#43: Add @JsonFormat(with=Feature.xxx) to support things like DeserializationFeature.WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED on per-property basis.
#58: Add new properties for @JsonIgnoreProperties, "allowGetters", "allowSetters"
#60: Add new value type, OptBoolean, for "optional booleans", to support proper handling and usage of default values, not just explicit true/false.
#61: Add new property, @JsonProperty.access (and matching enum) to support read-only/write-only properties
#64: Add @Documented for @JsonPropertyDescription

Streaming

#137: Allow filtering content read via JsonParser by specifying JsonPointer; uses new class com.fasterxml.jackson.core.filter.FilteringParserDelegate (and related, TokenFilter)
#177: Add a check so JsonGenerator.writeString() won't work if writeFieldName() expected.
#182: Inconsistent TextBuffer.getTextBuffer() behavior
#185: Allow filtering content written via JsonGenerator by specifying JsonPointer; uses new class com.fasterxml.jackson.core.filter.FilteringGeneratorDelegate (and related, TokenFilter)
#188: JsonParser.getValueAsString() should return field name for JsonToken.FIELD_NAME, not null
#189: Add JsonFactory.Feature.USE_THREAD_LOCAL_FOR_BUFFER_RECYCLING (default: true), which may be disabled to prevent use of ThreadLocal-based buffer recyling.
#195: Add JsonGenerator.getOutputBuffered() to find out amount of content buffered, not yet flushed.
#196: Add support for FormatFeature extension, for format-specifc Enum-backed parser/generator options
Other:
- Minor improvement to construction of "default PrettyPrinter": now overridable by data format modules
- Implement a new yet more optimized symbol table for byte-backed parsers
- Add JsonParser.Feature.IGNORE_UNDEFINED, useful for data formats like protobuf

Databind

#77: Allow injection of 'transient' fields
#95: Allow read-only properties with @JsonIgnoreProperties(allowGetters=true)
#296: Serialization of transient fields with public getters (add MapperFeature.PROPAGATE_TRANSIENT_MARKER)
#312: Support Type Id mappings where two ids map to same Class
#348: ObjectMapper.valueToTree() does not work with @JsonRawValue
#504: Add DeserializationFeature.USE_LONG_FOR_INTS
#624: Allow setting external ClassLoader to use, via TypeFactory
#649: Make BeanDeserializer use new parser.nextFieldName() and .hasTokenId() methods
#664: Add DeserializationFeature.ACCEPT_FLOAT_AS_INT to prevent coercion of floating point numbers int int/long/Integer/Long
#677: Specifying Enum value serialization using @JsonProperty
#688: Provide a means for an ObjectMapper to discover mixin annotation classes on demand
#689: Add ObjectMapper.setDefaultPrettyPrinter(PrettyPrinter)
#696: Copy constructor does not preserve _injectableValues
#698: Add support for referential types (ReferenceType)
#700: Cannot Change Default Abstract Type Mapper from LinkedHashMap
#725: Auto-detect multi-argument constructor with implicit names if it is the only visible creator
#727: Improve ObjectWriter.forType() to avoid forcing base type for container types
#734: Add basic error-recovery for ObjectReader.readValues()
#737: Add support for writing raw values in TokenBuffer
#740: Ensure proper null (as empty) handling for AtomicReference
#743: Add RawValue helper type, for piping raw values through TokenBuffer
#756: Disabling SerializationFeature.FAIL_ON_EMPTY_BEANS does not affect canSerialize()
#762: Add ObjectWriter.withoutRootName(), ObjectReader.withoutRootName()
#777: Allow missing build method if its name is empty ("")
#781: Support handling of @JsonProperty.required for Creator methods
#787: Add ObjectMapper setFilterProvider(FilterProvider) to allow chaining
#790: Add JsonNode.equals(Comparator<JsonNode>, JsonNode) to support configurable/external equality comparison
#794: Add SerializationFeature.WRITE_DATES_WITH_ZONE_ID to allow inclusion/exclusion of timezone id for date/time values (as opposed to timezone offset)
#795: Converter annotation not honored for abstract types
#810: Force value coercion for java.util.Properties, so that values are Strings
#811: Add new option, JsonInclude.Include.NON_ABSENT (to support exclusion of JDK8/Guava Optionals)
#813: Add support for new property of @JsonProperty.access to support read-only/write-only use cases
#820: Add new method for ObjectReader, to bind from JSON Pointer position
#824: Contextual TimeZone changes don't take effect wrt java.util.Date, java.util.Calendar serialization
#827: Fix for polymorphic custom map key serializer
#840: Change semantics of @JsonPropertyOrder(alphabetic) to only count true value
#848: Custom serializer not used if POJO has @JsonValue
#849: Possible problem with NON_EMPTY exclusion, ints, Strings
#868: Annotations are lost in the case of duplicate methods

Changes, Data formats

CSV

#72: Recognize the configured "null value" (String) also in reader-infrastructure.
#74: Problems with ordering, @JsonPropertyOrder losing alphabetic ordering
#83: Serializing List with null values leads to corrupt CSV

Protobuf

The very first official release!

YAML

#35: Add YAMLGenerator.Feature.SPLIT_LINES to allow controlling whether SnakeYAML splits longer text blocks with line breaks or not
- Also: upgrade to SnakeYAML 1.15

Changes, Data types

Guava

#64: @JsonUnwrapped annotation is ignored when a field is an Optional
#66: Add GuavaModule.configureAbsentsAsNulls(boolean) to change whether Optional.absent() is to be handled same as Java null during serialization (default: true) or not.
#67: Support deserializing ImmutableSetMultimaps
#68: Add support for JsonInclude.Include.NON_ABSENT, to compensate for #66
#70: Change OSGi manifest entries to import guava 15.0 or greater
#74: Multimap serializer ignores _valueTypeSerializer

Hibernate

#67: Provide support for Hibernate 5.x (hibernate5 maven sub-module; Hibernate5Module Jackson module)

HPPC

Update hppc dependency to 0.7.1
- NOTE! Due to HPPC API incompatibilities, this means that module can NOT be used with HPPC versions earlier than 0.7.0.
Minimum JDK version now 1.7, as per minimum by HPPC

JDK8

#8: JDK8 module should respect JsonInclude.Include.NON_ABSENT
#11: Add configureAbsentsAsNulls config setting, for better compatibility with Guava module

Joda

#49: testDateMidnightSerWithTypeInfo test dependent on $TZ
#58: Support timezone configuration for Interval deserializer
#62: Allow use of numbers-as-Strings for LocalDate (in array)
#64: Support @JsonFormat(pattern=...) for deserialization
#66: Support SerializationFeature.WRITE_DATES_WITH_ZONE_ID
#68: TimeZone in DeserializationContext is ignored with SerializationFeature.WRITE_DATES_WITH_ZONE_ID

JSR-310 (aka Java8 Dates)

#18: Support serializing and deserializing Maps with jsr310 types as keys
#26: ISO strings with time-component cause exception when deserializing to LocalDate
#29: Add support for @JsonFormat for Instant
#30: Make ZonedDateTime serializer support SerializationFeature.WRITE_DATES_WITH_ZONE_ID

Changes, Jackson jr

#24: String/byte[] composers can not write POJOs (ObjectCodec not linked)
Other
- Minor performance optimizations (+10-20% throughput), using new jackson-core 2.6 methods for reading, writing

Changes, JAX-RS

#39: Build alternate jars with qualifier "no-metainf-services", which do NOT include META-INF/services metadata for auto-registration

Changes, other modules

Afterburner

#46: Log-warning "Disabling Afterburner deserialization for type" using wrong logger-name
#53: Include checksum in generated class names (to resolve #52)

JSON Schema

#53: Add support to oneOf
#57: Enum types should generate a schema that includes the possible enum values
#60: Add readonly property to JsonSchema
#67: Unable to deserialize (extended/custom) Schema
#69: Add support for @Pattern annotations in String schemas
Added JsonSchemaGenerator(ObjectWriter) to allow use of (re-)configured ObjectWriter instead of ObjectMapper which can not be configured.

Mr Bean

#21: Change default package used for materialized classes to reflect Jackson 2.x

OSGi