aws-iot-device-sdk-java-samples/src/main/java/com/amazonaws/services/iot/client/sample/pubSub/PublishSubscribeSample.java [104:130]:
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    private static void initClient(CommandArguments arguments) {
        String clientEndpoint = arguments.getNotNull("clientEndpoint", SampleUtil.getConfig("clientEndpoint"));
        String clientId = arguments.getNotNull("clientId", SampleUtil.getConfig("clientId"));

        String certificateFile = arguments.get("certificateFile", SampleUtil.getConfig("certificateFile"));
        String privateKeyFile = arguments.get("privateKeyFile", SampleUtil.getConfig("privateKeyFile"));
        if (awsIotClient == null && certificateFile != null && privateKeyFile != null) {
            String algorithm = arguments.get("keyAlgorithm", SampleUtil.getConfig("keyAlgorithm"));

            KeyStorePasswordPair pair = SampleUtil.getKeyStorePasswordPair(certificateFile, privateKeyFile, algorithm);

            awsIotClient = new AWSIotMqttClient(clientEndpoint, clientId, pair.keyStore, pair.keyPassword);
        }

        if (awsIotClient == null) {
            String awsAccessKeyId = arguments.get("awsAccessKeyId", SampleUtil.getConfig("awsAccessKeyId"));
            String awsSecretAccessKey = arguments.get("awsSecretAccessKey", SampleUtil.getConfig("awsSecretAccessKey"));
            String sessionToken = arguments.get("sessionToken", SampleUtil.getConfig("sessionToken"));

            if (awsAccessKeyId != null && awsSecretAccessKey != null) {
                awsIotClient = new AWSIotMqttClient(clientEndpoint, clientId, awsAccessKeyId, awsSecretAccessKey,
                        sessionToken);
            }
        }

        if (awsIotClient == null) {
            throw new IllegalArgumentException("Failed to construct client due to missing certificate or credentials.");
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aws-iot-device-sdk-java-samples/src/main/java/com/amazonaws/services/iot/client/sample/shadowEcho/ShadowEchoSample.java [42:67]:
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    private static void initClient(CommandArguments arguments) {
        String clientEndpoint = arguments.getNotNull("clientEndpoint", SampleUtil.getConfig("clientEndpoint"));
        String clientId = arguments.getNotNull("clientId", SampleUtil.getConfig("clientId"));

        String certificateFile = arguments.get("certificateFile", SampleUtil.getConfig("certificateFile"));
        String privateKeyFile = arguments.get("privateKeyFile", SampleUtil.getConfig("privateKeyFile"));
        if (awsIotClient == null && certificateFile != null && privateKeyFile != null) {
            String algorithm = arguments.get("keyAlgorithm", SampleUtil.getConfig("keyAlgorithm"));
            KeyStorePasswordPair pair = SampleUtil.getKeyStorePasswordPair(certificateFile, privateKeyFile, algorithm);

            awsIotClient = new AWSIotMqttClient(clientEndpoint, clientId, pair.keyStore, pair.keyPassword);
        }

        if (awsIotClient == null) {
            String awsAccessKeyId = arguments.get("awsAccessKeyId", SampleUtil.getConfig("awsAccessKeyId"));
            String awsSecretAccessKey = arguments.get("awsSecretAccessKey", SampleUtil.getConfig("awsSecretAccessKey"));
            String sessionToken = arguments.get("sessionToken", SampleUtil.getConfig("sessionToken"));

            if (awsAccessKeyId != null && awsSecretAccessKey != null) {
                awsIotClient = new AWSIotMqttClient(clientEndpoint, clientId, awsAccessKeyId, awsSecretAccessKey,
                        sessionToken);
            }
        }

        if (awsIotClient == null) {
            throw new IllegalArgumentException("Failed to construct client due to missing certificate or credentials.");
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