Java Utililty Methods Security

AppConfigurationEntry configurationEntries[] = configuration.getAppConfigurationEntry(section);
if (configurationEntries == null) {
    String errorMessage = "Could not find a '" + section + "' entry in this configuration.";
    throw new IOException(errorMessage);
for (AppConfigurationEntry entry : configurationEntries) {
    Object val = entry.getOptions().get(key);
    if (val != null)
...

try {
    LdapName ldapName = new LdapName(name);
    for (Rdn rdn : ldapName.getRdns()) {
        if (rdn.getType().equalsIgnoreCase("cn")) {
            return rdn.getValue().toString();
    return name;
...

String value = directivesMap.get(directive);
if (value == null) {
    if (mandatory) {
        throw new AuthenticationException("\"" + directive + "\" mandatory directive is missing");
    return "";
return value;
...

if (configuration == null) {
    return null;
AppConfigurationEntry configurationEntries[] = configuration.getAppConfigurationEntry(section);
if (configurationEntries == null) {
    String errorMessage = "Could not find a '" + section + "' entry in this configuration.";
    throw new IOException(errorMessage);
return configurationEntries;

for (Object cred : subject.getPublicCredentials()) {
    if (type.isInstance(cred)) {
        return type.cast(cred);
return null;

long start = ticket.getStartTime().getTime();
long end = ticket.getEndTime().getTime();
return start + (long) ((end - start) * TICKET_RENEW_WINDOW);

Map<String, String> props = new HashMap<String, String>();
props.put(Sasl.POLICY_NOPLAINTEXT, "true");
return props;

Set<Object> serverCredentials = subject.getPrivateCredentials(Object.class);
KerberosPrincipal serverPrincipal = null;
KeyTab serverKeyTab = null;
for (Iterator<Object> i = serverCredentials.iterator(); i.hasNext();) {
    Object cred = i.next();
    if (cred instanceof KerberosKey) {
        KerberosKey key = (KerberosKey) cred;
        if (key.getKeyType() == keyType) {
...

InitialContext ctx = new InitialContext();
return (Subject) ctx.lookup("java:comp/env/security/subject");

Set<KerberosTicket> tickets = subject.getPrivateCredentials(KerberosTicket.class);
for (KerberosTicket ticket : tickets) {
    if (isOriginalTicketGrantingTicket(ticket)) {
        return ticket;
throw new IllegalArgumentException("kerberos ticket not found in " + subject);