Java is known to read &#x2F;dev&#x2F;random when dealing with SecureRandom class. In particular it might cause extremely slow starting time for Tomcat on fresh virtual machine. There&#x27;s parameter &quot;-Djava.security.egd=file:&#x2F;dev&#x2F;.&#x2F;urandom&quot; and I always felt unsafe using it. Thanks to this article, now I won&#x27;t regret it even theoretically.<p>Fun thing is, if you pass &quot;&#x2F;dev&#x2F;urandom&quot; to this parameter, Java will read &#x2F;dev&#x2F;random anyway. May be that was a wise decision 20 years ago.