Back again, About Exception Question

[Jesse Xie Y.S.]

I prefer to implement a business logic layer between user client and database, and I am just confusing about how could I deal with so much exception. Should I ignore the IOException? Could I ignore the RemoteException? Or maybe I could just transform it into other exception such as RecordNotFoundException or RoomNotFoundException?

Any help. TKS very much.

[Thomas Paul Bigbee]

http://java.sun.com/j2se/1.4.2/docs/guide/lang/chained-exceptions.html

The link above will take you to a good article on how to chain exceptions.

You can't ingnore Checked Exceptions, and you can't specify any new/broader exceptions when implementing an interface, you can however,chain exceptions (throw a RuntimeException) from within the IOException catch block, with the Cause and Stack information from the original exception, and handle it in the business tier

Hope this helps
Tom

[Jesse Xie Y.S.]

Hi, good day every one. I really don't know how to deal with IOException.

public synchronized long[] findByCriteria(String[] criteria) {
long[] result;
try{
dataFile.seek(getLocation(recNo));
... ...
return result;
} catch (IOException ioe) {
ioe.printStackTrace();
//If have exception return null;
return null;
}
//If have no result,return 0 length array
return new long[0];
}

how do you think?

[Jesse Xie Y.S.]

Hi Thomas, after I read over this forum about the IOException, I found that it is really a big problem. and now, I want to try your suggestion.

So I just create a new DataException and extends from RuntimeException, and I will catch it on business layer.

I think it's normally a fetal error about reading file, because my program will make sure that the file exist before create new Data instance.