#1891 ✓invalid
Chris Webb

heroku R14 errors with java Play 1 app running on OpenJDK 1.8

Reported by Chris Webb | November 23rd, 2014 @ 11:47 AM

I recently updated a play-heroku-1.3.0RC2-12-g87e2d3c app to use OpenJDK v1.8 on Heroku and am finding that after typical load I start getting R14 errors, which means the physical memory has exceeded the 512MB limit and is now swapping impacting performance. I need to restart the applications frequently to stop the R14 errors. The application is a very typical web application and I would expect it to run comfortably within the memory constraints.

Here is a screenshot from NewRelic showing the physical memory being exceeded.

NewRelic 7 day chart

I don't quite understand why the "used heap" appears to impact the "physical memory" when it hasn't come close to the "committed heap" and why the "physical memory" seems to more closely follow the "used heap" rather than the "committed heap"

I've used the Eclipse Memory Analyzer to analyse some heap dumps and the Leak Suspects report mentions play.Play and play.mvc.Router as suspects though I'm not sure if that's expected or if those specific issues are directly related to the physical memory being exceeded.

Leak Suspects

See the generated by MAT for more details.

I'm developing on OS X with Oracle Java 1.8 and have not yet been able to replicate the exact Heroku dyno environment locally (e.g. Ubuntu, OpenJDK 1.8) to reproduce the issue.

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<h2>Play framework</h2>

Play makes it easier to build Web applications with Java. It is a clean alternative to bloated Enterprise Java stacks. It focuses on developer productivity and targets RESTful architectures. Learn more on the <a href="http://www.playframework.org">http://www.playframework.org</a> website.<br><br>

<h2>Source code is hosted on github</h2>Check out our repository at <a href="http://github.com/playframework/play">http://github.com/playframework/play</a><br><br>

<h2>Contributing, creating a patch</h2> Please read the <a href="http://play.lighthouseapp.com/projects/57987/contributor-guide">contributor guide</a><br><br>

<h2>Reporting Security Vulnerabilities</h2> Since all bug reports are public, please report any security vulnerability directly to <em>guillaume dot bort at gmail dot com</em>.<br><br>

<h2>Creating a bug report</h2> Bug reports are incredibly helpful, so take time to report bugs and request features in our ticket tracker. We’re always grateful for patches to Play’s code. Indeed, bug reports with attached patches will get fixed far quickly than those without any.<br><br>

Please include as much relevant information as possible including the exact framework version you're using and a code snippet that reproduces the problem.<br><br>

Don't have too much expectations. Unless the bug is really a serious "everything is broken" thing, you're creating a ticket to start a discussion. Having a patch (or a branch on Github we can pull from) is better, but then again we'll only pull high quality branches that make sense to be in the core of Play.

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