kerby-kerb/kerb-simplekdc/src/main/java/org/apache/kerby/kerberos/kerb/client/JaasKrbUtil.java [68:95]:
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    public static Subject loginUsingTicketCache(
            String principal, File cacheFile) throws LoginException {
        Set<Principal> principals = new HashSet<>();
        principals.add(new KerberosPrincipal(principal));

        Subject subject = new Subject(false, principals,
                new HashSet<Object>(), new HashSet<Object>());

        Configuration conf = useTicketCache(principal, cacheFile);
        String confName = "TicketCacheConf";
        LoginContext loginContext = new LoginContext(confName, subject, null, conf);
        loginContext.login();
        return loginContext.getSubject();
    }

    public static Subject loginUsingKeytab(
            String principal, File keytabFile) throws LoginException {
        Set<Principal> principals = new HashSet<>();
        principals.add(new KerberosPrincipal(principal));

        Subject subject = new Subject(false, principals,
                new HashSet<Object>(), new HashSet<Object>());

        Configuration conf = useKeytab(principal, keytabFile);
        String confName = "KeytabConf";
        LoginContext loginContext = new LoginContext(confName, subject, null, conf);
        loginContext.login();
        return loginContext.getSubject();
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kerby-tool/kdc-tool/src/main/java/org/apache/kerby/kerberos/tool/kadmin/AuthUtil.java [48:75]:
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    public static Subject loginUsingTicketCache(
        String principal, File cacheFile) throws LoginException {
        Set<Principal> principals = new HashSet<>();
        principals.add(new KerberosPrincipal(principal));

        Subject subject = new Subject(false, principals,
            new HashSet<Object>(), new HashSet<Object>());

        Configuration conf = useTicketCache(principal, cacheFile);
        String confName = "TicketCacheConf";
        LoginContext loginContext = new LoginContext(confName, subject, null, conf);
        loginContext.login();
        return loginContext.getSubject();
    }

    public static Subject loginUsingKeytab(
        String principal, File keytabFile) throws LoginException {
        Set<Principal> principals = new HashSet<>();
        principals.add(new KerberosPrincipal(principal));

        Subject subject = new Subject(false, principals,
            new HashSet<Object>(), new HashSet<Object>());

        Configuration conf = useKeytab(principal, keytabFile);
        String confName = "KeytabConf";
        LoginContext loginContext = new LoginContext(confName, subject, null, conf);
        loginContext.login();
        return loginContext.getSubject();
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