src/example/multi-project/projects/version/src/version/Version.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package version;

import java.io.InputStream;
import java.util.Properties;
import java.util.Map;
import java.util.HashMap;

public final class Version {
    static {
        versions = new HashMap<>();
        register("version");
    }

    private static Map<String, String> versions;

    public static void register(String module) {
        try {
            InputStream moduleVersion = Version.class.getResourceAsStream("/" + module
                    + ".properties");
            Properties props = new Properties();
            props.load(moduleVersion);
            String version = (String) props.get("version");
            versions.put(module, version);
            System.out.println("--- using " + module + " v" + version);
        } catch (Exception ex) {
            System.err.println("an error occurred while registering " + module + ": "
                    + ex.getMessage());
            ex.printStackTrace();
        }
    }

    private Version() {
    }
}