Resolved the web start issue:

# su
(or sudo)
# ln /usr/lib/jvm/java-1.6.0.u1-sun-1.6.0.u1/jre/bin/javaws /usr/bin/javaws

...and then run:

javaws http://sweethome3d.sourceforge.net/SweetHome3D.jnlp

...and it works!

The original javaws had 0kb size. That was probably the problem.

Please, help me to resolve the intall issue.

Regards,

Oak