public String toString () {
        if ( this.gssContext == null || !this.gssContext.isEstablished() ) {
            return String.format("KERB5[src=%s,targ=%s]", this.clientName, this.serviceName);
        }
        try {
            return String
                    .format("KERB5[src=%s,targ=%s,mech=%s]", this.gssContext.getSrcName(), this.gssContext.getTargName(), this.gssContext.getMech());
        }