Sorry for delayed answer, I was not here last friday.
I installed the package 

xorg-x11-fonts

with its dependancies, (xorg-x11-fonts-core , fonts-config , ft2demos) 
 and it SOLVED the autosize problem

I have to say : now headless option isn't set anymore: so if I ask for 

System.out.println("java.awt.headless: " +
System.getProperty("java.awt.headless"));

it tells me "null" .

So, according to my system, installing x11-fonts solve the problem, set
headless option does not

Thank you very much for your help,
Andrea



> -----Messaggio originale-----
> Da: Nick Burch [mailto:[email protected]]
> Inviato: giovedì 30 maggio 2013 21:34
> A: POI Users List
> Oggetto: Re: R: strange problem with columns autosize
> 
> On Thu, 30 May 2013, Andrea Lanza wrote:
> > WITH  -Djava.awt.headless="true"
> > java.lang.NullPointerException
> >        at
> > sun.awt.X11FontManager.getDefaultPlatformFont(X11FontManager.java:779)
> 
> Do you have any fonts installed on the server? Looks like you might not
> have any, and your jvm isn't being very helpful in the error it gives for
> that...
> 
> Nick
> 
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