Question: Expand Abbreviations action in Java Editor

Can anyone explain how the Expand Abbreviations [abbrev-expand] action 
in Java Editor works?

Here is the scenario:
I bound a key stroke (Ctrl+Enter) to Expand Abbreviations 
[abbrev-expand]  action in Java editor key bindings options.
[I could not

I have an abbrev:

foria

which should expand to:

for (int i = 0; i < |.length; i ++) {
}

Now when I type:

foria<SPACE>

the abbreviation expands correctly. This seems to be an implicit key 
binding.

foria<Ctrl+Enter>

the abbreviation expands correctly too.

However if I type any char like backspace then the abbrev expansion does 
not work e.g.

foris<BACKSPACE>a<Ctrl+Enter>

then the abbreviation does not expand.

I think the Expand Abbreviations [abbrev-expand] should work as long as 
the text (word?) before the caret matches  an abbreviation.

Comments?

Sandip