There is a setting in EJS that allow you to either [u]keep java code[/u] or [u]remove java code[/u] after ejs class files were generated.
(I believe the default is [u]keep java code[/u]).
You can find java code in the generated directory (ejsfilename +".app")
It is under [u][b]_simulation[/b][/u] for EJS version 3, under [u][b]workspace/output/users/...[/b][/u] for EJS version 4.