Needless to say in Flex this would have never happened. In Flex Builder, if I would have forgotten a closing tag in some MXML file the editor would have shown it to me right away and I would have corrected it immediately. And for those using only the command line Flex compiler, the same would have happened, the compilation would have failed and the appropriate error message displayed with the exact line number.
Needless to say compiled code is a bliss :)
Also, the amount of Java code written to populate HTML Comboboxes is crazy, long live Flex and its data-driven controls, where simple data-binding does wonders. Fewer lines of code, less error prone and thus better productivity.