how to rethrow exception in Java

[Gil]

In C++, I can rethrow the exception I just caught
with the throw statement. Can I do something
similar in Java?

} catch (Exception ex) {
throw;
}

[Ryan Stewart]

Re: how to rethrow exception in Java

"Gil" <brightoceanlig ht@hotmail.com> wrote in message
news:adc2ca29.0 403170433.77086 376@posting.goo gle.com...[color=blue]
> In C++, I can rethrow the exception I just caught
> with the throw statement. Can I do something
> similar in Java?
>
> } catch (Exception ex) {
> throw;
> }[/color]
throw ex;

Please post to comp.lang.java. help instead of here in the future.

[Stewart Gordon]

Re: how to rethrow exception in Java

Gil wrote:
[color=blue]
> In C++, I can rethrow the exception I just caught
> with the throw statement. Can I do something
> similar in Java?
>
> } catch (Exception ex) {[/color]
throw ex;[color=blue]
> }[/color]

works perfectly fine for me.

Stewart.

--
My e-mail is valid but not my primary mailbox, aside from its being the
unfortunate victim of intensive mail-bombing at the moment. Please keep
replies on the 'group where everyone may benefit.

[Henrik Eiriksson]

Re: how to rethrow exception in Java

Gil wrote:
[color=blue]
> In C++, I can rethrow the exception I just caught
> with the throw statement. Can I do something
> similar in Java?
>
> } catch (Exception ex) {
> throw;
> }[/color]

you can throw a new exception upon catch including an informative message
and the original exception like this:

try {
//...code...
} catch(Exception ex) {
throw new Exception("your informative message", ex);
}

the new exception thrown can be your own exception type, specific to your
application. Read more here:

http://java.sun.com/docs/books/tutorial/essential/exceptions/throwing.html

[Yoyoma_2]

Re: how to rethrow exception in Java

Stewart Gordon wrote:[color=blue]
> Gil wrote:
>[color=green]
>> In C++, I can rethrow the exception I just caught
>> with the throw statement. Can I do something similar in Java?
>>
>> } catch (Exception ex) {[/color]
>
> throw ex;
>[color=green]
>> }[/color]
>
>
> works perfectly fine for me.
>
> Stewart.
>[/color]

If you are throwing exactly the same exception you catch, you don't have
to do the try catch for that exception.

ex:

public URL createURL( Context ctx ) throws MalformedURLExc eption{
return new URL( ctx.getMyUrlStr ing() );
}

[Yoyoma_2]

Re: how to rethrow exception in Java

Ryan Stewart wrote:
[color=blue]
> "Gil" <brightoceanlig ht@hotmail.com> wrote in message
> news:adc2ca29.0 403170433.77086 376@posting.goo gle.com...
>[color=green]
>>In C++, I can rethrow the exception I just caught
>>with the throw statement. Can I do something
>>similar in Java?
>>
>>} catch (Exception ex) {
>> throw;
>>}[/color]
>
> throw ex;
>
> Please post to comp.lang.java. help instead of here in the future.[/color]

For clarity, whats "java.help" do vs comp.lang.java? Is there a web page
for this newsgroup?
thanks

[Ryan Stewart]

Re: how to rethrow exception in Java

"Yoyoma_2" <Yoyoma_2@[at-]Hotmail.com> wrote in message
news:j356c.9238 9$Up2.82516@pd7 tw1no...[color=blue]
> Ryan Stewart wrote:
>[color=green]
> > "Gil" <brightoceanlig ht@hotmail.com> wrote in message
> > news:adc2ca29.0 403170433.77086 376@posting.goo gle.com...
> >[color=darkred]
> >>In C++, I can rethrow the exception I just caught
> >>with the throw statement. Can I do something
> >>similar in Java?
> >>
> >>} catch (Exception ex) {
> >> throw;
> >>}[/color]
> >
> > throw ex;
> >
> > Please post to comp.lang.java. help instead of here in the future.[/color]
>
> For clarity, whats "java.help" do vs comp.lang.java? Is there a web page
> for this newsgroup?
> thanks[/color]
It figures you'd ask the one time I don't write it out :) I don't know all
the details, but apparently the comp.lang.java hierarchy (possibly the whole
comp.* hierarchy?) is actually governed by some body or other, and this
group, comp.lang.java, is not supposed to exist. Therefore not all news
servers carry it and not all users can access it. Other groups, such as
comp.lang.java. help (for beginners) or c.l.j.programme r (more advanced) and
lots of others are "official" groups and widely carried by news servers.

[Stewart Gordon]

Re: how to rethrow exception in Java

Yoyoma_2 wrote:

<snip>[color=blue]
> If you are throwing exactly the same exception you catch, you don't have
> to do the try catch for that exception.
>
> ex:
>
> public URL createURL( Context ctx ) throws MalformedURLExc eption{
> return new URL( ctx.getMyUrlStr ing() );
> }[/color]

I just assumed that the OP wanted to do something in the catch besides
rethrowing it, but which had been omitted from the post.

Stewart.

--
My e-mail is valid but not my primary mailbox, aside from its being the
unfortunate victim of intensive mail-bombing at the moment. Please keep
replies on the 'group where everyone may benefit.