Java Virtual Machine implementation of Jelly, an RDF serialization format and gRPC streaming protocol, written in Scala 3. Jelly-JVM currently supports both Apache Jena and RDF4J.

This collection of libraries aims to provide the full stack of utilities for fast and scalable RDF streaming with the Jelly protocol. You can only use a part of the stack (e.g., only the serializer), or you may choose to use the full gRPC server and the reactive streaming utilities.

Documentation, download links, usage guide and more: https://w3id.org/jelly/jelly-jvm

Read more about each module in the documentation.

• jelly-core – serialization and deserialization code (using the scalapb library), along with generic utilities for converting the deserialized RDF data to/from the representations of RDF libraries (like Apache Jena or RDF4J).

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• jelly-jena – conversions and interop code for the Apache Jena library.

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• jelly-rdf4j – conversions and interop code for the RDF4J library.

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• jelly-stream – utilities for building Reactive Streams of RDF data (based on Pekko Streams). Useful for integrating with gRPC or other streaming protocols (e.g., Kafka, MQTT).

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• jelly-grpc – implementation of a gRPC client and server for the full Jelly protocol.

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• jelly-integration-tests – integration tests for the Jelly protocol. This module is only used for development and testing purposes.
• jelly-examples – examples of using Jelly-JVM in practical scenarios.

We also publish plugin JARs which allow you to use Jelly-JVM with Apache Jena and RDF4J just by dropping the JARs into the classpath. You can find the JARs on the releases page. More information about using the plugins.

Feel free to submit bug reports, feature proposals and pull requests!

Check out the contribution guide for more information.

The Jelly-JVM libraries are licensed under the Apache 2.0 license.

Jelly-JVM was written by Piotr Sowiński (Ostrzyciel).