What's New

What's New in 5.2

The 5.2 driver release includes the following new features, improvements, and fixes:

• Adds the SearchIndexType class, which you can pass when constructing a SearchIndexModel instance. This change allows you to specify the index type when creating an Atlas Search or Vector Search index. To learn more, see the Atlas Search and Vector Search Indexes guide.

• Delegates the implementation of the algorithms that implement the SCRAM-SHA-1 and SCRAM-SHA-256 authentication mechanisms to the configured JCA provider. This change means that your application can use a configured FIPS-compliant JCA provider to provide a higher level of security.

• Revises the mongodb-crypt dependency versioning to match the versioning for the JVM drivers. Future versions of mongodb-crypt will be released alongside the driver and will share the same version number. You must upgrade your mongodb-crypt dependency to v5.2.0 when upgrading your driver for this release. To learn more, see the In-Use Encryption guide.

• Performance improvements due to implementation of native cryptography on all supported platforms. The following list describes the actions needed to implement this improvement depending on your operating system:

  • Windows: Upgrade your mongodb-crypt version to v5.2.0.

  • Mac: Upgrade your mongodb-crypt version to v5.2.0.

  • Linux: Install libmongocrypt.so directly on the file system, instead of using the file that is bundled within the mongodb-crypt JAR file. You can find Linux instructions to install libmongocrypt in the Server manual. If you use a package manager to install libmongocrypt, Java Native Access (JNA) will find it there without further configuration. Alternatively, you can specify the search path by setting the LD_LIBRARY_PATH environment variable to the file path of the libmongocrypt package.

    We recommend direct installation because the bundled shared library does not link with OpenSSL due to the potential for OpenSSL binary incompatibilities.

    The shared library loading is handled by JNA. You can view the rules for library loading search path order in the NativeLibrary class documentation.

• Fixes an issue that caused the InsertOneResult.getInsertedId() and InsertManyResult.getInsertedIds() methods to return incorrect document IDs in some situations. This change is backported to Kotlin Sync driver v5.1.4 and v4.11.4.

• When a sharded cluster operation is unsuccessful, the driver avoids selecting the same mongos server for operation retry attempts if other mongos servers are available.

• Adds reachability metadata needed when your application uses GraalVM Native Image. This metadata replaces the need for collecting reachability metadata when using the driver libraries. To learn more, see Reachability Metadata in the GraalVM documentation.

  This change does not add the libjnidispatch and libmongocrypt resource entries, because adding entries for all supported platforms (targets) significantly affects the size of native executables built using GraalVM Native Image. View this sample resource-config.json file in the driver GitHub repository to see how to specify these entries explicitly if your application depends on the org.mongodb:mongodb-crypt library.

• Enables exact vector search by extending the VectorSearchOptions API to introduce the following specific option subtypes:

  • ExactVectorSearchOptions: Use this options type to enable precise matching, ensuring that results are the closest vectors to a given query vector.

  • ApproximateVectorSearchOptions: Use this options type to enable searches that might not return the exact closest vectors. You can pass a numCandidates parameter when instantiating this type to specify the number of nearest neighbors to consider.

  To learn more about using the Atlas Vector Search feature, see the Atlas Vector Search Quick Start and select Kotlin (Sync) from the language dropdown.

• Adds support for serializers from the kotlinx-datetime library that let you map Kotlin date and time types to BSON as the expected types instead of as strings. To learn more, see the Serialize Dates and Times section of the Kotlin Serialization guide.

• Supports serialization of JsonElement values. To work with the JsonElement type, you must add the kotlinx-serialization-json library as a dependency in your application.

What's New in 5.1.3

The 5.1.3 driver patch release includes the following changes:

• Fixes an issue that could cause assertion errors when using Cursor types.

What's New in 5.1.2

The 5.1.2 driver patch release includes the following changes:

• Support for encoding Kotlin data classes with nullable generic parameter types. For example, you can encode the Container class in the following code:

  @Serializable
  data class Box<T>(
      val boxed: T
  )
  @Serializable
  data class Container(
      val box: Box<String?>
  )

What's New in 5.1.1

The 5.1.1 driver patch release includes the following changes:

• When using the MONGODB-OIDC authentication mechanism, you must not include comma characters in the authMechanismProperties connection string value.

What's New in 5.1

This section includes the following information:

• Deprecations in 5.1

• Improvements in 5.1

• New Features in 5.1

What's New in 5.0

New features of the 5.0 driver release include:

• The KotlinSerializerCodecProvider constructor now accepts serializersModule and bsonConfiguration objects:

  KotlinSerializerCodec.create(clazz.kotlin, serializersModule=serializersModule, bsonConfiguration=bsonConfiguration)

  This makes it easier to customize your configuration.

• Fixes a Kotlin reflection bug that resulted in container type erasure.