Java Inference SDK

After you deploy a Qwak-based model, your JVM-based client applications can use this module to get inferences from the model hosted as a real-time endpoint.

Inference Example

The following example invokes the model test_model. The model accepts one feature vector which contains three fields and produces one output field named "score".

RealtimeClient client = RealtimeClient.builder()

PredictionResponse response = client.predict(PredictionRequest.builder()
                        .feature("feature_a", "feature_value")
                        .feature("feature_b", 1)
                        .feature("feature_c", 0.5)

Optional<PredictionResult> singlePrediction = response.getSinglePrediction();
double score = singlePrediction.get().getValueAsDouble("score");


The Java Inference SDK is hosted on Qwak's internal maven repository.

Maven Configuration

To set up a Maven-based application that uses the Java Inference SDK, add the following sections to the projects pom.xml:



     <name>Qwak Maven Repository</name>




Gradle Configuration

To set up a Gradle-based application that uses the Java Inference SDK, add the following sections to the projects build.gradle:

repositories {
  maven {
    url ""


dependencies {
    implementation ''

Scala SBT Configuration

Please note, Qwak does not distribute javadoc or sources JAR files. To ensure seamless integration and prevent potential issues within your Scala IDE or sbt environment, it is recommended to proactively disable the automatic fetching or inclusion of these artifacts in your project settings.

resolvers += "Qwak Maven Repository" at ""

libraryDependencies ++= Seq(
  "" % "qwak-inference-sdk" % "1.0-SNAPSHOT" classifier "",

Model metadata

To retrieve the model metadata, use the ModelMetadataClient:


ModelMetadataClient client = ModelMetadataClient.builder()
  .apiKey("YOUR QWAK API KEY")
ModelMetadata metadata = client.getModelMetadata("MODEL NAME");

The ModelMetadata class has the following methods:

public Map<String, Object> getModel() # returns information about the model
public List<Map<String, Object>> getDeploymentDetails() # if the model is deployed, it returns data about deployment configuration
public Map<String, Map<String, Object>> getAudienceRoutesByEnvironment() # audience configuration per environment
public List<Map<String, Object>> getBuilds() # data about the DEPLOYED builds