When I analyze a DevMode process's memory usage (e.g. using jconsole), it shows that Heap and Non-Heap (PermGen) Memory usage increases, whenever the page is reloaded.
This happens both when I run DevMode with Firefox 14, as well as Chrome 21. The difference is however, that - with Chrome, Heap and PermGen usage restores to a very low value after calling "Perform GC" - whereas in Firefox the PermGen stays at the high value, and the Heap just decreases slightly. After a number of reloads, this leads to an out of memory (Heap or PermGen, depending on which reaches the limit first). More often than not, the out of memory is not printed (which is usual for out of memory errors). *How to reproduce the error?* Create a simple GWT project (e.g. the one that's auto-generated by Eclipse), use Firefox, press the reload-button repeatedly (tested on OS X 10.6, but I've encountered similar memory problems on Linux amd64, too) *Solution?* Without knowing anything about the details of the FF plugin, it looks as if the Chrome plugin discards the ClassLoader entirely (so the PermGen space can be freed up <http://stackoverflow.com/a/148707/291741>), whereas FF probably keeps a reference to the ClassLoader somewhere (?) *Problems when restarting DevMode* The problem may also explain, why many people are seeing an [ERROR] Unable to bind socket on port 9997 -- is another session active? java.net.BindException: Address already in use after restarting DevMode (see e.g. https://groups.google.com/d/topic/google-web-toolkit/btPIOoriq_o/discussion , http://code.google.com/p/google-web-toolkit/issues/detail?id=4312 , http://code.google.com/p/google-web-toolkit/issues/detail?id=4514 , ...). It would also explain, why it's often dismissed as "cannot reproduce" (because it cannot be reproduced with Chrome). But when stopping a DevMode server that is (nearly) out of memory, it may hang. And you usually won't see an error message (the reason why I finally found this issue, is that I did get it a few times now). Plus, in Eclipse it looks as if DevMode had already terminated (the red stop button turns gray). *Question:* Is it a good idea to create another new issue for this? I'd like to ask here first, if anybody knows what the Status is? @AlanLeung? -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/aDdcADCmUbIJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
