jcifs-ng will be a proper choice for many users. 
There are a lot of SMB devices in the world.
Some of them only work with the old jcifs library.
If you want to support many SMB devices, CodeLibs jcifs library will be helpful.
For example, since [Fess](https://github.com/codelibs/fess) needs to support many SMB devices, it uses this library.

import jcifs.netbios.NbtAddress;
import jcifs.smb.DfsReferral;
import jcifs.smb.NtStatus;
import jcifs.smb.NtlmPasswordAuthentication;
import jcifs.smb.SmbAuthException;
import jcifs.smb.SmbException;
import jcifs.smb.SmbFile;
import jcifs.smb.SmbFileInputStream;


/**
 * This servlet may be used to "browse" the entire hierarchy of resources
 * on an SMB network like one might with Network Neighborhood or Windows

import jcifs.dcerpc.DcerpcHandle;
import jcifs.smb.SmbException;
import jcifs.smb.SmbFile;
import jcifs.smb.SmbResourceLocatorInternal;


/**
 * @author mbechler
 *
 */
@SuppressWarnings ( "javadoc" )
public class FileLocationTest {

    @Test
    public void testRoot () throws MalformedURLException, CIFSException {
        try ( SmbResource p = new SmbFile("smb://", getContext()) ) {

        assertEquals(hogeAuth, smbAuthenticationHolder.get("smb://hoge/"));
        assertEquals(fugaAuth, smbAuthenticationHolder.get("smb://fuga/"));
        assertEquals(fooAuth, smbAuthenticationHolder.get("smb://foo:1000/"));
        assertEquals(hogeAuth, smbAuthenticationHolder.get("smb://hoge/text.txt"));
        assertEquals(fugaAuth, smbAuthenticationHolder.get("smb://fuga/text.txt"));

    static final boolean FORCE_UNICODE = Config.getBoolean( "jcifs.smb1.smb.client.useUnicode", false );
    static final boolean USE_NTSTATUS = Config.getBoolean( "jcifs.smb1.smb.client.useNtStatus", true );
    static final boolean SIGNPREF = Config.getBoolean("jcifs.smb1.smb.client.signingPreferred", false );
    static final boolean USE_NTSMBS = Config.getBoolean( "jcifs.smb1.smb.client.useNTSmbs", true );

     *         itself.
     */

    String getName ();


    /**
     * 
     * @return dfs referral data
     */
    DfsReferralData getDfsReferral ();


    /**
     * Everything but the last component of the URL representing this SMB
     * resource is effectively it's parent. The root URL <code>smb://</code>
     * does not have a parent. In this case <code>smb://</code> is returned.
     *

                return cfg;
            }
        });

        MUTATIONS.put("smb1-noSigning", new TestMutation() {

            @Override
            public Map<String, String> mutate ( Map<String, String> cfg ) {
                cfg.put("jcifs.smb.client.maxVersion", "SMB1");
                cfg.put("jcifs.smb.client.signingPreferred", "false");

#log4j.logger.jcifs.internal.smb2.create: DEBUG
#log4j.logger.jcifs.smb.SmbTreeConnection: DEBUG
#log4j.logger.jcifs.smb.SmbTransportImpl: DEBUG
#log4j.logger.jcifs.util.transport.Transport: DEBUG
#log4j.logger.jcifs.smb.DfsImpl: DEBUG
#log4j.logger.jcifs.smb: DEBUG
#log4j.logger.jcifs.smb.SmbFileOutputStream: TRACE
#log4j.logger.jcifs.smb.SigningDigest: TRACE

/**
 * @author mbechler
 *
 */
public interface SMBSigningDigest {

    /**
     * Performs MAC signing of the SMB. This is done as follows.
     * The signature field of the SMB is overwritten with the sequence number;
     * The MD5 digest of the MAC signing key + the entire SMB is taken;
     * The first 8 bytes of this are placed in the signature field.
     *
     * @param data
     *            The data.

 */
package jcifs;


import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;


/**
 * This is an internal API for managing pools of SMB connections
 * 
 * @author mbechler
 * @internal
 */
public interface SmbTransportPool {

    /**
     * @param tf
     * @param name
     * @param port
     * @param exclusive