Note that the supported platforms / JDK versions for JBT/JBDS are most often the same as those of the underlying Eclipse supported platforms / JDK versions:
http://www.eclipse.org/eclipse/development/readme_eclipse_3.7.html#TargetOperatingEnvironments
http://www.eclipse.org/eclipse/development/readme_eclipse_3.6.2.html#TargetOperatingEnvironments
http://www.eclipse.org/eclipse/development/readme_eclipse_3.5.2.html#TargetOperatingEnvironments