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Java Client

Nessie has a thin client designed to be incorporated into existing projects with minimum difficulty. The client is a thin layer over Nessie’s openapi Rest APIs.

To use the Nessie client, you can add it as a dependency to your Java project using Maven. The coordinates are:


For ease of integration with tools that carry many dependencies, the Nessie client’s dependencies are declared optionaly. It is designed to work with any recent version JAX-RS client (Jersey and Resteasy are both tested inside Nessie’s tests) + Jackson’s DataBinding and JAX-RS modules (any version from the last ~3+ years).


The NessieClient object wraps a Jersey Client and exposes interactions with the Nessie Rest API. To use it simply

client = NessieClient.basic(path, username, password);
List<Reference> references = client.getTreeApi().getAllReferences();

The client API has the full set of methods required to interact with Nessie at this level. The above example authenticates with basic auth using a username and password. If using the AWS client and authenticating with IAM roles use to instantiate a client. The path argument is the full url for the nessie endpoint (eg http://localhost:19120/api/v1).


The Nessie server is based on the Quarkus microkernel appserver and can run in a traditional JVM or be precompiled into a native image via GraalVM. We develop all code using JDK11 and then compile for release on JDK8.

Rest API

The Rest API is composed primarily of the Contents, Tree and Config APIs.

Versioning Kernel

Deeper in the server, the core commit kernel is built on top of the VersionStore SPI

New Backing Store

Nessie comes pre-packaged with three storage engines: JGit, In-Memory and DynamoDB. For production deployments, DynamoDB is the recommended storage engine. The Nessie team is always evaluating new potential backing stores. If you’re looking to implement something new, shout out to us via one of our communication channels to discuss what you’re thinking so we can figure out the best way to move forward.