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Index › Programming Questions & Help › Syntax Questions › dealing with errors

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dealing with errors (Read 377 times)

AndreiRT

dealing with errors
Sep 29^th, 2008, 5:32am

hello,

I would to ask if Processing has some kind of error processing, or if most errors are going to generate Java exceptions. I am using some data from Internet, and my application crashes when it cann't access my server. I would like to test if it can acess the server and, if not, use the last data grabbed from it. But I don't see any elegant way to make that, despite programming directly in Java.

thank you,
andrei

PhiLho

Re: dealing with errors
Reply #1 - Sep 29^th, 2008, 10:16pm

What do you call "crashes"? In traditional programming (eg. in C), it means the system is displaying an error message after the program exited (with flames and thunder). In Java, it is more likely to display some stack trace, no?

In Java, the traditional way to handle such issue (like resource not available) is to wrap the possibly offending call in a try/catch block: it offers an opportunity to recover from the error.

AndreiRT YaBB Newbies Offline Posts: 8	Re: dealing with errors Reply #2 - Sep 30^th, 2008, 2:33pm hello Phillo, I call "crash" when Processing stops due to an exception. I would like to have some kind of try/catch with Processing. I tried, but was not able to find any information about this. thank you, andrei

fry

Re: dealing with errors
Reply #3 - Sep 30^th, 2008, 2:57pm

we don't do exceptions from (nearly) any processing api, see the explanation here:
http://processing.org/discourse/yabb_beta/YaBB.cgi?board=LibraryProblems;action=display;num=1221502447;start=4#4

if you're doing something like loadStrings() or loadImage(), it will return null when it fails. if you're using the net client class, see the explanation in that thread.

AndreiRT YaBB Newbies Offline Posts: 8	Re: dealing with errors Reply #4 - Sep 30^th, 2008, 3:16pm thanks for the link. I am using processing.xml.XMLElement class to read a XML dinamically generated at a server by a PHP script, but I was not being able to deal with lost connections or with the server being down. After reading the link, I think I should study the source of XMLElement class

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