Re: [aspectj-users] how exception handling works?

[Paulo Alexandre Corigo Zenida <paulo.zenida@xxxxxxxx>]

Hi Steve,

In order for you not being forced to handle the exception in the method 
methodSocket(), you need to use the softening exception capability of 
AspectJ. That will turn your checked exceptions into unchecked ones, 
which means you are not forced to handle the exception in your method. 
Then, you can do what you wished in your e-mail, in the aspect:

public aspect MyAspect {

declare soft : java.io.IOException : execution(void MyClass.methodSocket());

 void around() : call(void MyClass.methodSocket()) {
   try {
     proceed();
   } catch(Exception e) {
     System.out.println(e.getCause());
   }
 }
}

public class MyClass {
  void methodSocket() {
   socket.connect(new InetSocketAddress("www.google.de", 82), 200);
 }
}

If you want to know more about this or you want to "preserve" the 
checked exception, look in the AspectJ book, by Ramnivas Laddad, and 
read about the Exception introduction pattern.

Regards,

Paulo Zenida

Citando Steve Kirkaw <skirkaw@xxxxxxxxxxxxxx>:

> Hi,
>
> I am stuck with exception handling in aspectj.
>
> Let's say in a method in the class I execute the following snippet:
>
> void methodSocket() {
>
> try {
>
> socket.connect(new InetSocketAddress("www.google.de",80),200);
> }catch(IOException e)  {
>  e.printStackTrace();
> }
> }
>
> I would like to remove the exception handling from methodSocket and
> encapsulate it within an aspect as follows:
>
> void methodSocket() {
> socket.connect(new InetSocketAddress("www.google.de",80),20);
> }
>
> public aspect SocketAspect {
>
>   pointcut p(): call(* java.net.Socket.connect(..));
>
> after(): p() {
>     throw new IOException();
> }
> }
>
> What is wrong with this aspect? How can I achieve my aim?
>
> Thanks in advance



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