3.3.2. Elytron を使用した Kerberos 認証の統合

// create your authentication configuration
AuthenticationConfiguration configuration = AuthenticationConfiguration.empty()
    .useProvidersFromClassLoader(SecuredGSSCredentialClient.class.getClassLoader())
    .useGSSCredential(getGSSCredential());

// create your authentication context
AuthenticationContext context = AuthenticationContext.empty().with(MatchRule.ALL, configuration);

// create a callable that looks up an EJB and invokes a method on it
Callable<Void> callable = () -> {
...
};

// use your authentication context to run your callable
context.runCallable(callable);

private GSSCredential getGSSCredential() {
    return Subject.doAs(subject, new PrivilegedAction<GSSCredential>() {

        public GSSCredential run() {
            try {
                GSSManager gssManager = GSSManager.getInstance();
                return gssManager.createCredential(GSSCredential.INITIATE_ONLY);
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }
    });
}