The sources are available here: https://beansbinding.dev.java.net/files/documents/6779/73673/beansbinding-1.2.1-src.zip More info: http://deadlock.netbeans.org/hudson/job/trunk/ws/form/external/beansbinding-1.2.1-license.txt
fyi. beanbindings is in java-experimental (would actually be nice to get it into the tree) :)
Thx for the info :-) I do not know why I thought this is a netbeans patched library :-)