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PostgreSQL JDBC Driver JDBC4
There is a newer version: 42.7.5
package org.postgresql.gss;

import org.postgresql.core.Logger;
import org.postgresql.core.PGStream;
import org.postgresql.util.GT;
import org.postgresql.util.PSQLException;
import org.postgresql.util.PSQLState;
import org.postgresql.util.ServerErrorMessage;

import org.ietf.jgss.GSSContext;
import org.ietf.jgss.GSSCredential;
import org.ietf.jgss.GSSException;
import org.ietf.jgss.GSSManager;
import org.ietf.jgss.GSSName;
import org.ietf.jgss.Oid;

import java.io.IOException;
import java.security.PrivilegedAction;

class GssAction implements PrivilegedAction {
  private final PGStream pgStream;
  private final String host;
  private final String user;
  private final String kerberosServerName;
  private final Logger logger;
  private final boolean useSpnego;
  private final GSSCredential clientCredentials;


  public GssAction(PGStream pgStream, GSSCredential clientCredentials, String host, String user,
      String kerberosServerName, Logger logger, boolean useSpnego) {
    this.pgStream = pgStream;
    this.clientCredentials = clientCredentials;
    this.host = host;
    this.user = user;
    this.kerberosServerName = kerberosServerName;
    this.logger = logger;
    this.useSpnego = useSpnego;
  }

  private static boolean hasSpnegoSupport(GSSManager manager) throws GSSException {

    org.ietf.jgss.Oid spnego = new org.ietf.jgss.Oid("1.3.6.1.5.5.2");
    org.ietf.jgss.Oid mechs[] = manager.getMechs();

    for (Oid mech : mechs) {
      if (mech.equals(spnego)) {
        return true;
      }
    }

    return false;
  }

  public Exception run() {

    try {

      GSSManager manager = GSSManager.getInstance();
      GSSCredential clientCreds = null;
      Oid desiredMechs[] = new Oid[1];
      if (clientCredentials == null) {
        if (useSpnego && hasSpnegoSupport(manager)) {
          desiredMechs[0] = new Oid("1.3.6.1.5.5.2");
        } else {
          desiredMechs[0] = new Oid("1.2.840.113554.1.2.2");
        }
        GSSName clientName = manager.createName(user, GSSName.NT_USER_NAME);
        clientCreds = manager.createCredential(clientName, 8 * 3600, desiredMechs,
            GSSCredential.INITIATE_ONLY);
      } else {
        desiredMechs[0] = new Oid("1.2.840.113554.1.2.2");
        clientCreds = clientCredentials;
      }

      GSSName serverName =
          manager.createName(kerberosServerName + "@" + host, GSSName.NT_HOSTBASED_SERVICE);

      GSSContext secContext = manager.createContext(serverName, desiredMechs[0], clientCreds,
          GSSContext.DEFAULT_LIFETIME);
      secContext.requestMutualAuth(true);

      byte inToken[] = new byte[0];
      byte outToken[] = null;

      boolean established = false;
      while (!established) {
        outToken = secContext.initSecContext(inToken, 0, inToken.length);


        if (outToken != null) {
          if (logger.logDebug()) {
            logger.debug(" FE=> Password(GSS Authentication Token)");
          }

          pgStream.sendChar('p');
          pgStream.sendInteger4(4 + outToken.length);
          pgStream.send(outToken);
          pgStream.flush();
        }

        if (!secContext.isEstablished()) {
          int response = pgStream.receiveChar();
          // Error
          if (response == 'E') {
            int l_elen = pgStream.receiveInteger4();
            ServerErrorMessage l_errorMsg =
                new ServerErrorMessage(pgStream.receiveErrorString(l_elen - 4), logger.getLogLevel());

            if (logger.logDebug()) {
              logger.debug(" <=BE ErrorMessage(" + l_errorMsg + ")");
            }

            return new PSQLException(l_errorMsg);

          } else if (response == 'R') {

            if (logger.logDebug()) {
              logger.debug(" <=BE AuthenticationGSSContinue");
            }

            int len = pgStream.receiveInteger4();
            int type = pgStream.receiveInteger4();
            // should check type = 8
            inToken = pgStream.receive(len - 8);
          } else {
            // Unknown/unexpected message type.
            return new PSQLException(GT.tr("Protocol error.  Session setup failed."),
                PSQLState.CONNECTION_UNABLE_TO_CONNECT);
          }
        } else {
          established = true;
        }
      }

    } catch (IOException e) {
      return e;
    } catch (GSSException gsse) {
      return new PSQLException(GT.tr("GSS Authentication failed"), PSQLState.CONNECTION_FAILURE,
          gsse);
    }

    return null;
  }
}