The same bug existed on Debian and has been closed :
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=626050

The fix seems to be backported in version 3.1+dfsg-1ubuntu1 of this package, 
that should be shipped with oneiric : see the changelog in 
https://launchpad.net/ubuntu/+source/sweethome3d/3.1+dfsg-1ubuntu1
Installing this package on oneiric makes sweethome3d runnable with default jre 
(openjdk-6), without the need to install sun-java6.
It also works if you install this version on natty (but you have to force the 
installation with a dpkg --force-depends-version).

Anyway, I noticed that 3D performance was much better with the Sun JDK
(at least with the one bundled in the .tgz downloadable on the official
site : http://www.sweethome3d.com/fr/download.jsp) than with openjdk-6.
I'm not sure if I tested the package sun-java6 of ubuntu (it should be
the same as Sun JDK).

I might be wrong, but it seems to me that Sun JDK has some 3D hardware 
acceleration (and/or optimization) that is not enabled in openjdk-6. I tested 
openjdk-7 (in a beta version, some time ago), and noticed that the performance 
was the same as with Sun JDK. See 
http://www.sweethome3d.com/support/forum/viewthread_thread,1658
Unfortunately, openjdk-7 will not yet be the default jre for oneiric (still 
openjdk-6)

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https://bugs.launchpad.net/bugs/769038

Title:
  sweethome3d does not start

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