System.out.println在Play Framework控制台中按顺序打印

我正在使用Play 2.4和Activator 1.3.7,我注意到System.out.println并不总是打印到浏览器中的控制台.这是非常罕见的,但我今天抓住了它.这是打印语句的顺序:

    System.out.println("width : " + mobileCrawl.getWidth());
    System.out.println("window width : " + mobileCrawl.getWindowWidth());
    System.out.println("scroll width : " + mobileCrawl.getScrollWidth());
    System.out.println("seed : " + mobileCrawl.getSeed());
    System.out.println("resolved seed : " + mobileCrawl.getResolvedSeed());
    System.out.println("crawl date : " + mobileCrawl.getCrawlDate());
    System.out.println("400 : " + mobileCrawl.isDetected400());
    System.out.println("401 : " + mobileCrawl.isDetected401());
    System.out.println("402 : " + mobileCrawl.isDetected402());
    System.out.println("403 : " + mobileCrawl.isDetected403());
    System.out.println("404 : " + mobileCrawl.isDetected404());
    System.out.println("500 : " + mobileCrawl.isDetected500());
    System.out.println("501 : " + mobileCrawl.isDetected501());
    System.out.println("502 : " + mobileCrawl.isDetected502());
    System.out.println("503 : " + mobileCrawl.isDetected503());

这是打印的订单(URL已更改):

width : 980
window width : 980
scroll width : 980
seed : http://google.com/
resolved seed : https://www.google.com/
400 : false
401 : false
402 : false
crawl date : Fri Dec 18 11:18:09 MST 2015
403 : false
500 : false
404 : true
501 : false
502 : false
503 : false

日期打印后应该有三行.这些是来自同一个线程的所有打印语句,它们都来自System.out,而不是任何来自System.err,所以不应该有任何交错.

这些打印怎么打乱了？我想System.out保证订单.