import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;

import org.junit.Test;

import static org.junit.Assert.assertNotNull;

public class TT080DgiiOrderResponseTest {

  @Test
  public void testParseJson() throws IOException {
    String jsonData = "{\n" +
        "    \"total\": 100," +
        "    \"val\": 2000," +
        "}";

    ObjectMapper objectMapper = new ObjectMapper();
    TT080DgiiOrderResponse response = objectMapper.readValue(jsonData, JsonMapped.class);
    assertNotNull(response);
  }

}

.....
import com.fasterxml.jackson.annotation.JsonProperty;

public class JsonMapped {
   @JsonProperty("total")
   private Long total
   @JsonProperty("val")
   private Long value;
}