Date: Fri, 5 May 2006 17:13:48 +0100 From: Scott Mitchell <scott+lists.freebsd@fishballoon.org> To: Fernan Aguero <fernan@iib.unsam.edu.ar>, freebsd-java@freebsd.org Subject: Re: java without X11? Message-ID: <20060505161347.GB94802@llama.fishballoon.org> In-Reply-To: <20060505133535.GB12509@iib.unsam.edu.ar> References: <20060504121812.GA94022@iib.unsam.edu.ar> <20060504123935.GB94022@iib.unsam.edu.ar> <20060504214118.GA1072@tuatara.fishballoon.org> <20060505133535.GB12509@iib.unsam.edu.ar>
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On Fri, May 05, 2006 at 10:35:35AM -0300, Fernan Aguero wrote: > +----[ Scott Mitchell <scott+lists.freebsd@fishballoon.org> (04.May.2006 18:45): > | > | The java binary in diablo-1.5.0_06 doesn't have a load-time dependency on > | libX11.so or any other X11 libraries, nor libawt.so - I guess the JVM will > | dlopen() libawt.so if it needs to do any graphical stuff. As proof of > | concept a simple "Hello, World" Java program compiles and runs just fine on > | a machine with no X11 libraries installed. I expect any program that > | didn't use AWT/Swing would work just as well. > > Great, that was what I was about to do once I could get > hands on this box. > > So, this means that I could safely ignore the warnings about missing > dependencies (upon package installation)? I believe so, as long as your Java program really doesn't need X11... > | Interestingly libawt.so doesn't have any direct X11 dependencies either, > | rather it depends on libmawt.so, of which several different versions exist, > | in the jre/lib/i386/{xawt,motif21,headless} directories. The xawt and > | motif21 versions depend on various X11 libraries, but the headless version > | does not. It looks like setting the java.awt.headless property to true or > | just having no $DISPLAY will cause the headless libraries to be used. You > | should be able to use AWT/Swing classes in any way that doesn't require > | access to a real display - so loading any manipulating images should work, > | but trying to say open a window will throw a HeadlessException. > OK, good to know. > > thanks for your reply, Glad I could help. Cheers, Scott -- =========================================================================== Scott Mitchell | PGP Key ID | "Eagles may soar, but weasels Cambridge, England | 0x54B171B9 | don't get sucked into jet engines" scott at fishballoon.org | 0xAA775B8B | -- Anon
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