On 24/06/2013 08:32, Mark Thomas wrote: > On 24/06/2013 05:31, David Rees wrote: >> On Fri, Jun 21, 2013 at 9:28 AM, Christopher Schultz >> <ch...@christopherschultz.net> wrote: >>> I just upgraded to 1.7.0_25 on my Mac and I noticed that when I launch >>> Tomcat, I get a dock icon indicating that it is running. This does not >>> happen on 1.7.0_21, the previous version I was running. >>> >>> For some reason, 1.7.0_25 triggers something launching the AWT thread >>> (on my Mac, that's called AWT-AppKit) which causes the dock icon to be >>> shown. >> >> I noticed something similar on Linux - Tomcat stopped working on >> machines without all the appropriate X-libs in place. I'll have to try >> adding -Djava.awt.headless=true to the startup parameters... > > I had a nasty feeling when I read this that I have just confirmed. > > The AWT thread is triggered by Tomcat's memory leak prevention code. I > haven't tracked down exactly what is triggering this yet. I should have > the answer to that later today.
Root cause found. I discovered Oracle have actually fixed one of the memory leaks in Java 7 (!) so the protection is only required if running on Java 6 or earlier (and very early Java 7 versions). The protection was triggering AWT initialisation and as of Java 7 update 25 that requires a graphical environment and starts a Thread. I have disabled the protection by default for Java 7 and greater and that has resolved the issues. When running on Java 6 or earlier the protection will still be enabled by default. The fix will be in Tomcat 7.0.42 onwards. > It is probably about time the various memory leaks were reported to > Oracle. Based on past experience of reporting JRE bugs, I have very > little faith the bugs will be accepted let alone fixed (which I why I > haven't bothered so far) but it looks like now is the time to report them. I still need to muster the motivation to do this. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
