Conflict with Spring cloud SpringApplication run

58行目付近のFluentLoggerFactoryから始め、FluentLoggerのsenderのライフサイクルがSpringApplicationおよびBootstrapApplicationListenerとどのように相互作用するかを調べます。log(String tag, Map<String,Object> data, long timestamp)でNullPointerExceptionを再現し、その後nullのsenderのケースに対するカバレッジを追加します。アプリケーションを繰り返し起動してもこの失敗が発生しなくなれば完了です。

Conflict with Spring cloud SpringApplication run. spring cloud because BootstrapApplicationListener.Causes Spring Application to execute many times.
and call FluentLogger stop. close sender, with sender is null.
then call log(String tag, Map<String, Object> data, long timestamp) function Throw out NullPointerException？
in FluentLoggerFactory 58 line add this code?

public synchronized FluentLogger getLogger(String tagPrefix, String host, int port, int timeout, int bufferCapacity,
            Reconnector reconnector) {
        String key = String.format("%s_%s_%d_%d_%d", new Object[] { tagPrefix, host, port, timeout, bufferCapacity });

        for (Map.Entry<FluentLogger, String> entry : loggers.entrySet()) {
            if (entry.getValue().equals(key)) {
                FluentLogger found = entry.getKey();
                if(found != null) {
                    if(found.getSender() == null){
                        found.setSender(getNewSender(host, port, timeout, bufferCapacity, reconnector));
                    }
                    return found;
                }
                break;
            }
        }


        FluentLogger logger = new FluentLogger(tagPrefix, getNewSender(host, port, timeout, bufferCapacity, reconnector));
        loggers.put(logger, key);
        return logger;
    }

private Sender getNewSender( String host, int port, int timeout, int bufferCapacity, Reconnector reconnector){
        Sender sender = null;
        Properties props = System.getProperties();
        if (!props.containsKey(Config.FLUENT_SENDER_CLASS)) {
            // create default sender object
            sender = new RawSocketSender(host, port, timeout, bufferCapacity, reconnector);
        } else {
            String senderClassName = props.getProperty(Config.FLUENT_SENDER_CLASS);
            try {
                sender = createSenderInstance(senderClassName, new Object[] { host, port, timeout, bufferCapacity });
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
        return sender;
    }