The Java client is currently kept in the Stargate core repository because the protobuf stub is used by the server-side implementation as well as a client for tests. The grpc-proto module also contains helpers for authentication and value conversion for gRPC types to and from Java types. To use the client from your application use the following dependencies:

<dependencies>
    <dependency>
        <groupId>io.stargate.grpc</groupId>
        <artifactId>grpc-proto</artifactId>
        <version>1.0.40</version>
    </dependency>
    <dependency>
         <groupId>io.grpc</groupId>
         <artifactId>grpc-netty-shaded</artifactId>
         <version>1.40.1</version>
    </dependency>
</dependencies>

The core repository also has information for getting started with the gRPC client for Java.