The crash is related to a version mismatch between GTK2, GTK3 and Debian's GLIBC. The relevant bug is here: https://bugs.eclipse.org/bugs/show_bug.cgi?id=430736
To force the use of GTK2 on Eclipse Luna you can try:
$ export SWT_GTK3=0For a more permanent solution you can set the GTK version on the eclipse.ini file:
--launcher.GTK_versionThis option should be inserted before the --launcher.appendVmargs option.
And now you should be able to use Eclipse Luna on Wheezy.