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Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.

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//
//  ========================================================================
//  Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.util;

import java.io.InputStream;
import java.time.Instant;
import java.util.Properties;

import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;

public class Jetty
{
    private static final Logger LOG = Log.getLogger( Jetty.class);

    public static final String VERSION;
    public static final String POWERED_BY;
    public static final boolean STABLE;
    public static final String GIT_HASH;

    /**
     * a formatted build timestamp with pattern yyyy-MM-dd'T'HH:mm:ssXXX
     */
    public static final String BUILD_TIMESTAMP;
    private static final Properties __buildProperties = new Properties( );

    static
    {
        try
        {
            try (InputStream inputStream = //
                     Jetty.class.getResourceAsStream( "/org/eclipse/jetty/version/build.properties" ))
            {
                __buildProperties.load( inputStream );
            }
        }
        catch ( Exception e )
        {
            LOG.ignore( e );
        }

        String git_hash = __buildProperties.getProperty( "buildNumber", "unknown" );
        if (git_hash.startsWith("${"))
            git_hash = "unknown";
        GIT_HASH = git_hash;
        System.setProperty( "jetty.git.hash" , GIT_HASH );
        BUILD_TIMESTAMP = formatTimestamp( __buildProperties.getProperty( "timestamp", "unknown" ));

        // using __buildProperties.getProperty("version") will contain version from the pom

        Package pkg = Jetty.class.getPackage();
        if (pkg != null &&
                "Eclipse.org - Jetty".equals(pkg.getImplementationVendor()) &&
                pkg.getImplementationVersion() != null)
            VERSION = pkg.getImplementationVersion();
        else
            VERSION = System.getProperty("jetty.version", "9.4.z-SNAPSHOT");

        POWERED_BY="Powered by Jetty:// "+VERSION+"";

        // Show warning when RC# or M# is in version string
        STABLE = !VERSION.matches("^.*\\.(RC|M)[0-9]+$");
    }

    private Jetty()
    {
    }


    private static String formatTimestamp( String timestamp )
    {
        try
        {
            long epochMillis = Long.parseLong(timestamp);
            return Instant.ofEpochMilli(epochMillis).toString();
        }
        catch ( NumberFormatException e )
        {
            LOG.ignore( e );
            return "unknown";
        }
    }
    
}