// Test SID that throws exception in toDisplayString
        SID exceptionSID = new SID() {
            @Override
            public SID getDomainSid() {
                return null;
            }

            @Override
            public int getRid() {
                return 0;
            }

            @Override
            public String toDisplayString() {

    public String getAccountId(final SID sid) {
        final int type = sid.getType();
        if (logger.isDebugEnabled()) {
            try {
                logger.debug("Processing SID: {} {} {}", type, sid, sid.toDisplayString());
            } catch (final Exception e) {
                // ignore
            }
        }
        final Integer id = fessConfig.getAvailableSmbSidType(type);
        if (id != null) {