https://sourceforge.net/p/dacapobench/bugs/93/2012-04-10T15:47:55ZRecent changes to 93: NullPointerException in TeeOutputStream2012-04-10T15:47:55Z2012-04-10T15:47:55ZRadu GRIGOREhttps://sourceforge.net/u/radugrigore/https://sourceforge.net0e0d5de9289afbad751eef75db04260190a34b1c

<div class="markdown_content"><p>The class TeeOutputStream is used to redirect System.out, and so is used from multiple threads. It is, however, not thread-safe.</p> <p>The relevant part of the code is the following:</p> <p>class TeeOutputStream {<br /> private OutputStream log;<br /> public void closeLog() { log = null; }<br /> public void write() { if (log != null) /* here another thread calls closeLog */ log.write(); }<br /> }</p> <p>I have observed this bug with the tomcat benchmark. But, being a concurrency bug, it is hard to reproduce.</p></div>