public void setServicePrincipal(String servicePrincipal) {
        this.servicePrincipal = servicePrincipal;
    }
The service principal of the application.
For web apps this is <code>HTTP/full-qualified-domain-name@DOMAIN</code>.
The keytab must contain the key for this principal.

@param servicePrincipal service principal to use
@see #setKeyTabLocation(Resource)
pac4j-kerberos/src/main/java/org/pac4j/kerberos/credentials/authenticator/SunJaasKerberosTicketValidator.java