To force JBDS 3 (Mac 32-bit Carbon) to use a specific (32-bit) JDK on startup, edit your eclipse.ini file:
http://wiki.eclipse.org/Eclipse.ini#Mac_OS_X_Example
See also:
http://wiki.eclipse.org/IRC_FAQ#I_just_installed_Eclipse_on_my_64-bit_system.2C_but_it_does_not_start._What_is_the_problem.3F
http://wiki.eclipse.org/IRC_FAQ#How_do_I_start_Eclipse.3F
Description
Clicking on JBoss Developer Studio.app results in the attached error.