Huynh Anh Dung dungha at
Thu Apr 28 04:20:15 CEST 2016

Hi Jaap
I upgrade memory from 6 GB to 8GB then I do compile java file again, this this output problem.
Problem:	A - A
Submitted:	09:17
Language:	Java
Result: compiler-error

Compilation output

Compiling failed with exitcode 1, compiler output:
Error occurred during initialization of VM
Could not reserve enough space for object heap
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

Compilation failed.

Lec. Huỳnh Anh Dũng

-----Original Message-----
From: DOMjudge-devel [mailto:domjudge-devel-bounces at] On Behalf Of Jaap Eldering
Sent: Thursday, April 28, 2016 8:57 AM
To: domjudge-devel at
Subject: Re: Questions

Hello Huỳnh Anh Dũng,

Given your previous email you don't have cgroups enabled. In that case you should raise the memory limit to something quite high. I'd suggest to start with 2GB and increment this to 2.5 and 3 GB if it doesn't work yet. That's because the Java VM pre-allocates a lot of memory. With cgroup support this is not an issue, but without you have to add that overhead to the memory limit. Then you also have to change the value of MEMRESERVED in the java compile script executable you use (java_javac_detect by default).

If you're trying to enable cgroups, then make sure to follow the instructions in the administrators manual. In particular, make sure to edit the boot options, reboot, and after that, again run './configure'
and rebuild and reinstall domjudge.


On 27-04-16 22:38, Huynh Anh Dung wrote:
> Hi,
> My default setting, I need to change any value here, to help system can compile java file.
> Lec. Huỳnh Anh Dũng
> -----Original Message-----
> From: Tobias Werth [mailto:tobias.werth at]
> Sent: Thursday, April 28, 2016 12:24 AM
> To: Huynh Anh Dung <dungha at>; 'Jesús Alberto Domínguez 
> Alfonso' <jesusalbertodominguez1983 at>; 
> DOMjudge-devel at
> Subject: Re: Questions
> Hi,
> On 04/27/16 17:27, Huynh Anh Dung wrote:
>> define('USE_CHROOT', true); and how to disable to run java file as 
>> you recommend
> to disable the chroot, you set this value to false.
> Note that disabling the chroot is strongly discouraged since it 
> reduces security.
>> I have problem about JAVA please help how to fix this problem.
> I assume that you do not use cgroups (using cgroups is also strongly 
> recommended). Then you have to increase the memory limit by a huge margin.
> See
> for details.
> Tobi
> _______________________________________________
> DOMjudge-devel mailing list
> DOMjudge-devel at

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