UserAuthSample.java

NameCallback usernameCallback = new NameCallback("username");
PasswordCallback passwordCallback = new PasswordCallback("password", false);

usernameCallback.setName("admin");
passwordCallback.setPassword(new char[]{'a', 'd', 'm', 'i', 'n'};

Callback[] callbacks = {usernameCallback, passwordCallback};

try {
    //Authentication
    AuthenticationContext authenticationContext = CarbonSecurityDataHolder.getInstance().getCarbonRealmService()
                    .getCredentialStore().authenticate(callbacks);
    user = authenticationContext.getUser();
    //Authorization
    user.isAuthorized(new Permission(carbonPermission.getName(), carbonPermission.getActions()));
    
} catch (AuthenticationFailure authenticationFailure) {
    throw new LoginException("Authentication failure.");
}