class MindlessClient{
...
	if (request.invalid())
	{
		String requestLoggedUUID = FileLogger.persistFile(request.getOutputStream());
		String configurationFileUUID = FileLogger.persistFile(Configuration.toString());
		LOG.error("Request invalid. UUIDs request: "+requestLoggedUUID +", configuration: "+configurationFileUUID );
		// no guarantees, that files are successfully saved. we don't bother, anyway
	}
...
}


class FileLogger{
Thread processorLog = new Thread(new Runnable(){
@override
public void run()
{
	while(true)
	{
		try{
		Pair<Object,String> p = queue.take();
		File f = new File("/path/to/shared/nfs/"+p.getSecond());
		IOUtils.write(f,p.getFirst()); // blocking, cleans up
		}
		catch(InterruptedException ie) {/* disregard that*/}
		catch(IOException ioe) {LOGGER.error(e,e);}
	}
}
});

static{
	processorLog.start();
}
BlockingQueue<Pair<Object,String>> filesToPersist=new LinkedBlockingQueue<Pair<Object,String>>();

/* dont block, return always instantly*/
public static String persistFile(String/* or InputStream */ content){
	String filename="FILE"+UUID.randomUUID(); // Should generate something like FILE{0aa1ff-08fa-1112ac-77341a} which is distinguishable, unique reference to file in log.
	filesToPersist.add(Pair.of(content,filename));
	return filename;
};
public static FileWriteStatus getFileStatus(String uuid)
{
//check queues, check file existence on fs, return status: WAITING, WRITTEN, MISSING
}

}