[ros-users] rosjava bug and message overflow

Nicholas Butko nbutko at cogsci.ucsd.edu
Thu Apr 22 01:47:20 UTC 2010


I did a little work updating rosjava a little while ago, and use it  
frequently. I am listed as the current maintainer, I think. I can  
handle patches like this if you like, but I am currently out of town  
and away from my computer until Friday.

Brett, if you send me a patch, I can take care of it on Friday.


On Apr 21, 2010, at 11:18 AM, Brian Gerkey <gerkey at willowgarage.com>  

> Btw, rosjava is in need of a maintainer.
> I did a bit of work this morning to get rosjava, test_rosjava, and
> rosclj unblacklisted and building against both boxturtle and latest.
> So at least our continuous integration system
> (http://build.willowgarage.com/) will let us know if they stop
> working.
> But in the long term, we'll need somebody who uses rosjava to
> volunteer to maintain it.
>    brian.
> On Wed, Apr 21, 2010 at 1:16 PM, Brett Ponsler <bponsler at wpi.edu>  
> wrote:
>> Hello everyone,
>> I joined the mailing list yesterday and so I apologize if these  
>> points have
>> been brought up previously.
>> Here's a little background information: I am running ROS on Ubuntu  
>> 9.10. I
>> am using both roscpp and rosjava on two machines.
>> First of all, I have noticed a bug with rosjava. When creating  
>> constant
>> Strings within an ROS message it fails to add the surrounding  
>> quotations.
>> For example:
>> string TEMP=HELLO
>> Would become: public static final String TEMP = HELLO;
>> Instead of: public static final String TEMP = "HELLO";
>> Is this currently being fixed? If not, I can provide a patch for  
>> the bug.
>> Now for the real question: Is there a maximum length for the size  
>> of a
>> string that can be sent through an ROS message? I have noticed that  
>> there
>> seems to be a limit of about 475 characters after which it causes a  
>> buffer
>> overflow (we have observed ROS completely crashing when a string of  
>> 476
>> characters is sent but not when 475 are sent).
>> The crash occurs prior to entering the subscribed method, which is  
>> why I
>> assume it's in the ROS library.
>> Thanks for your help,
>> Brett Ponsler
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