For those like me who are entering the ruby world but have programming experience with other languages, it can be hard to get things done, but that’s a part of ruby, doing things differently 
On a language like Java or C# the syntax is:
try
{
some_code();
}
catch(Exeption)
{
handle_expeption();
}
finally
{
this_code_is_always_executed();
}
On Ruby the ideia is the same, but the syntax is a little different:
begin – rescue – ensure
Lets see:
begin
some_code
rescue
handle_error
ensure
this_code_is_always_executed
end
If you need to log the error, you can have access to the error message inside rescue block:
@error_message="#{$!}"
Hope you find it as useful as I did 
its working thanks
if i want to catch or pick the element which got failed, in a report. In java we to to catch using printstacktrace n all type methods. Do we have anything in ruby to do this. I want to catch the element which got failed while running my ruby script.
begin
your_code
rescue => err
logger.error err.message
end