I have installed jbt 3 via update site and in my eclipse 3.5 and looked in my plugin-directory:
I see double entries:
for example:
org.hibernate.eclipse_3.3.0.M3-N200907020001-H7 // from my previous installation
org.hibernate.eclipse_3.3.0.v201003050540R-H56-GA // from the new update-installation
So I guess, the update does not overwrite or delete other older versions of the same plugin! Am I right? This was my origin question.
However, after update I can use jbt 3.