Hi all,
I changed the Hudson configuration by adding JDK 1.5.0_16 besides the already installed JDK 1.6.0_06. By default the projects are now build using JDK 1.5 (which is the target JDK for GeoNetwork, but for some reason 1.6 was installed for Hudson until now).
The JDK to be used to build can be configured per project in case you need to use JDK 1.6 for some reason in a project.
The Hudson site:
http://buildtest.osgeo.org:8080/osgeo/geonetwork/hudson/
Ciao,
Jeroen