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H2O REST API bindings
There is a newer version: 3.46.0.5
package water.bindings.examples.retrofit;

import water.bindings.H2oApi;
import water.bindings.pojos.*;
import water.bindings.proxies.retrofit.*;

import java.io.IOException;
import java.util.UUID;

public class Merge_Example {

    public static void mergeExample(String url) throws IOException {
        H2oApi h2o = url != null ? new H2oApi(url) : new H2oApi();

        // Set url if specified
        if (url != null) {
            h2o.setUrl(url);
        }

        // Utility var:
        JobV3 job = null;

        // init a session
        String sessionId = h2o.newSession().sessionKey;


        // import and parse files
        { // tourism
          ImportFilesV3 importBody = h2o.importFiles("../smalldata/merge/tourism.csv", null);
          ParseSetupV3 parseSetupParams = new ParseSetupV3();
          parseSetupParams.sourceFrames = H2oApi.stringArrayToKeyArray(importBody.destinationFrames, FrameKeyV3.class);
          parseSetupParams.checkHeader = 1;
          ParseSetupV3 parseSetupBody = h2o.guessParseSetup(parseSetupParams);

          ParseV3 parseParms = new ParseV3();
          H2oApi.copyFields(parseParms, parseSetupBody);
          parseParms.destinationFrame = H2oApi.stringToFrameKey("tourism");
          parseParms.blocking = true;
          ParseV3 parseBody = h2o.parse(parseParms);
        }

        { // heart
          ImportFilesV3 importBody = h2o.importFiles("../smalldata/merge/heart.csv", null);
          ParseSetupV3 parseSetupParams = new ParseSetupV3();
          parseSetupParams.sourceFrames = H2oApi.stringArrayToKeyArray(importBody.destinationFrames, FrameKeyV3.class);
          parseSetupParams.checkHeader = 1;
          ParseSetupV3 parseSetupBody = h2o.guessParseSetup(parseSetupParams);

          ParseV3 parseParms = new ParseV3();
          H2oApi.copyFields(parseParms, parseSetupBody);
          parseParms.destinationFrame = H2oApi.stringToFrameKey("heart");
          parseParms.checkHeader = 1;
          parseParms.blocking = true;
          ParseV3 parseBody = h2o.parse(parseParms);
        }

        // convert heart.geotime to categorical / factor

        RapidsSchemaV3 rapidsParms = new RapidsSchemaV3();
        rapidsParms.sessionId = sessionId;
        rapidsParms.ast = "(assign heart (:= heart (as.factor (cols heart 1)) 1 [0:263]))";
        h2o.rapidsExec(rapidsParms);

        // merge datasets
        rapidsParms.ast = String.format("(assign mergedframe (merge %s %s TRUE FALSE [] [] \"auto\") )",
                                            "tourism",
                                            "heart");
        h2o.rapidsExec(rapidsParms);

        // STEP 99: end the session
        h2o.endSession();
    }

  public static void mergeExample() throws IOException {
    mergeExample(null);
  }

    public static void main (String[] args) throws IOException {
        mergeExample();
    }
}