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description
Documentation on how to connect to Hopsworks from a Java client.

Java client

This guide explains step by step how to connect to Hopsworks from a Java client.

Generate an API key

For instructions on how to generate an API key follow this user guide. For the Java client to work correctly make sure you add the following scopes to your API key:

  1. featurestore
  2. project
  3. job
  4. kafka

Connecting to the Feature Store

You are now ready to connect to the Hopsworks Feature Store from a Java client:

//Import necessary classes
import com.logicalclocks.hsfs.FeatureStore;
import com.logicalclocks.hsfs.FeatureView;
import com.logicalclocks.hsfs.HopsworksConnection;

//Establish connection with Hopsworks.
HopsworksConnection hopsworksConnection = HopsworksConnection.builder()
  .host("my_instance")                      // DNS of your Feature Store instance
  .port(443)                                // Port to reach your Hopsworks instance, defaults to 443
  .project("my_project")                    // Name of your Hopsworks Feature Store project 
  .apiKeyValue("api_key")                   // The API key to authenticate with the feature store
  .hostnameVerification(false)               // Disable for self-signed certificates
  .build();

//get feature store handle
FeatureStore fs = hopsworksConnection.getFeatureStore();

//get feature view handle
FeatureView fv = fs.getFeatureView(fvName, fvVersion);

// get feature vector
List<Object> singleVector = fv.getFeatureVector(new HashMap<String, Object>() {{
        put("id", 100);
        }});

Next Steps

For more information how to interact from Java client with the Hopsworks Feature store follow this tutorial.