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A-Jetty Base can run on Android Java as well as on standard Java 7+ and it can run precompiled JSP/JSTL.

There is a newer version: 1.0.5

//
//  ========================================================================
//  Copyright (c) 1995-2016 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.security;

import java.security.Principal;

import org.eclipse.jetty.util.B64Code;

public class SpnegoUserPrincipal implements Principal
{
    private final String _name;
    private byte[] _token;
    private String _encodedToken;

    public SpnegoUserPrincipal( String name, String encodedToken )
    {
        _name = name;
        _encodedToken = encodedToken;
    }

    public SpnegoUserPrincipal( String name, byte[] token )
    {
        _name = name;
        _token = token;
    }

    public String getName()
    {
        return _name;
    }

    public byte[] getToken()
    {
        if ( _token == null )
        {
            _token = B64Code.decode(_encodedToken);
        }
        return _token;
    }

    public String getEncodedToken()
    {
        if ( _encodedToken == null )
        {
            _encodedToken = new String(B64Code.encode(_token,true));
        }
        return _encodedToken;
    }
}