QLDB tutorial for JavaでConstants.javaだけEclipseから実行できません

前提・実現したいこと

AWSのQLDBのTutorialのJavaアプリケーションで、Githubからリポジトリをクローンし、最新版のEclipseとJava8（指定だったので）で走らせようとしています。

発生している問題・エラーメッセージ

Constants.javaのみ実行メニューにプログラムとして実行が出ません。他のサンプルコードはすべてプログラムとして実行可能です。EclipseでConstants.javaを右クリックして出てくるメニューに「実行」までは表示されるのですが、「Javaプログラムとして実行」が表示されません。

該当のソースコード

Java
1/*
2 * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
3 * SPDX-License-Identifier: MIT-0
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy of this
6 * software and associated documentation files (the "Software"), to deal in the Software
7 * without restriction, including without limitation the rights to use, copy, modify,
8 * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
12 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
13 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
14 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
15 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
16 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
17 */
18
19package software.amazon.qldb.tutorial;
20
21import com.amazon.ion.system.IonSystemBuilder;
22import com.fasterxml.jackson.databind.SerializationFeature;
23import com.fasterxml.jackson.dataformat.ion.IonObjectMapper;
24import com.fasterxml.jackson.dataformat.ion.ionvalue.IonValueMapper;
25
26/**
27 * Constant values used throughout this tutorial.
28 */
29public final class Constants {
30    public static final int RETRY_LIMIT = 4;
31    public static final String LEDGER_NAME = "vehicle-registration";
32    public static final String VEHICLE_REGISTRATION_TABLE_NAME = "VehicleRegistration";
33    public static final String VEHICLE_TABLE_NAME = "Vehicle";
34    public static final String PERSON_TABLE_NAME = "Person";
35    public static final String DRIVERS_LICENSE_TABLE_NAME = "DriversLicense";
36    public static final String VIN_INDEX_NAME = "VIN";
37    public static final String PERSON_GOV_ID_INDEX_NAME = "GovId";
38    public static final String VEHICLE_REGISTRATION_LICENSE_PLATE_NUMBER_INDEX_NAME = "LicensePlateNumber";
39    public static final String DRIVER_LICENSE_NUMBER_INDEX_NAME = "LicenseNumber";
40    public static final String DRIVER_LICENSE_PERSONID_INDEX_NAME = "PersonId";
41    public static final String JOURNAL_EXPORT_S3_BUCKET_NAME_PREFIX = "qldb-tutorial-journal-export";
42    public static final String USER_TABLES = "information_schema.user_tables";
43    public static final String LEDGER_NAME_WITH_TAGS = "tags";
44    public static final IonObjectMapper MAPPER = new IonValueMapper(IonSystemBuilder.standard().build());
45
46    private Constants() { }
47
48    static {
49        MAPPER.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
50    }
51}
52