LCM failing on new drake installation (Was an OSX 10.10 Yosemite issue with IPV6)

[peteflorence]

Getting following error after calling LCM to set up visualizer outside of MATLAB:

"LC singleton fail: java.net.SocketException: Can't assign requested address"

Some notes:

• Running MATLAB 2013b on Yosemite
• Fresh install of drake from last night was working fine
• Not sure what changed between last night and today, but anything calling lcm to set up the visualizer now crashes MATLAB
• After the above error message, MATLAB instantly crashes
• Captured screenshot below of error message

[peteflorence]

Seems to be interference with networking setup... Andy is helping fix...

[tkoolen]

I had a similar issue last week. For me Matlab exited before it printed the error message, but running from the command line showed the same SocketException. It went away after I rebooted, but a real fix would be great.

[peteflorence]

We have been able to avoid the issue when WiFi is turned off. Everything works fine with WiFi off, and can still plug in via ethernet to get Internet.

Still trying to find a fix without shutting off WiFi

[peteflorence]

We've tried running sudo /Users/pflomacpro/drake-distro/drake/util/setup_loopback_multicast.sh

as was suggested in the error message, but does not work.

Also Twan, yes my Matlab exits almost instantaneously too. I just grabbed a cmd+shift+3 screenshot right as it was closing.

[peteflorence]

Twan, we found a real fix, coming shortly...

[peteflorence]

Fixed:

• Problem: ipv6 seems to be crashing Java, which crashes LCM and takes Matlab too
• Solution: StackOverflow answer explained how to default the JVM back to ipv4: http://stackoverflow.com/questions/18747134/getting-cant-assign-requested-address-java-net-socketexception-using-ehcache
• To get Matlab talking to JVM, we followed instructions here: http://www.mathworks.com/matlabcentral/answers/92813-how-do-i-increase-the-heap-space-for-the-java-vm-in-matlab-6-0-r12-and-later-versions
• All you have to do:
• 1. navigate or create to java.opts which is inside $MATLABROOT/bin/$ARCH (in my case, MATLAB_R2013B.app/bin/maci64)
• 2. add following line to java.opts:

-Djava.net.preferIPv4Stack=true

Note, my java.opts file also had:

-Dapple.awt.graphics.UseQuartz=true

Thanks Andy!

[tkoolen]

Thanks for the detailed description @peteflorence, I had to do this again and your comment was very helpful.

[peteflorence]

Glad it was helpful @tkoolen !

[RussTedrake]

👍 -- just ran into this on the build server and luckily googling for a solution took me right back to this page. :) thanks again @andybarry and @peteflorence

[peteflorence]

Glad it helped!

On Monday, April 13, 2015, Russ Tedrake notifications@github.com wrote:

[image: 👍] -- just ran into this on the build server and luckily
googling for a solution took me right back to this page. :) thanks again
@andybarry https://github.com/andybarry and @peteflorence
https://github.com/peteflorence

—
Reply to this email directly or view it on GitHub
#558 (comment)
.

[peteflorence]

Added Yosemite and IPV6 to the title to help people find this, seems to keep coming up

[DiitsGp]

I got this error again today. It went away after I re-opened MATLAB, but I thought I'd let you know that somehow this can still happen...here's a screenshot of my java.opts file

(Error occurred while running solvers/trajectoryOptimization/test/contactImplicitBrick.m)

[tkoolen]

Do you have two versions of Matlab maybe?

[DiitsGp]

No, just a single install of R2014b. I couldn't replicate the problem so it's probably nothing to worry about, I just found it curious that LCM path thing happened again.

[liangfok]

Can LCM be updated to support IPv6? Or, is this fundamentally a Java issue?

[RussTedrake]

You could post this to the lcm issue page...?

[liangfok]

Done: lcm-proj/lcm#59

[pvarin]

My installation of Matlab (R2016a for maci64) didn't come with a java.opts file and I was having trouble with getting Matlab to read my java.opts file from the $MATLABROOT/bin/$ARCH directory, so I symlink-ed it to the startup directory (which can be found by running the userpath command from the Matlab command line) and it seemed to work.