411 REFERENCE · Wikibooks
WebObjects/Web Applications/Development/Custom Error Handling
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Exception Page
To provide a custom error handler when an exception is thrown, override the method:
public WOResponse handleException (java.lang.Exception anException, WOContext aContext) { }
For example:
public WOResponse handleException(Exception _exception, WOContext _context) {
Session session = (Session) _context.session();
// do something to notify user of exception, maybe put a message in the session here ...
WOResponse response;
if (/* you can't handle exception*/) {
response = super.handleException(_exception, _context);
}
else {
response = pageWithName(YourExceptionPage.class.getName(), _context).generateResponse();
}
return response;
}
Session Expired
To provide a custom error handler when an exception is thrown, override the method:
public WOResponse handleSessionRestorationErrorInContext(WOContext _context) {
For example:
public WOResponse handleSessionRestorationErrorInContext(WOContext _context) {
Session session = (Session) _context.session();
// do something to notify user of exception, maybe put a message in the session here ...
WOResponse response = pageWithName(YourErrorPage.class.getName(), _context).generateResponse();
return response;
}
Your Request Produced an Error
Chuck Hill
This message started to appear in WO 5.2 when an exception was raised in a DirectAction, but only in deployed applications. Here is what is happening:
WODisplayExceptionPages
true or false to enable or disable the generation of WOExceptionPages for direct action requests. Default is true in development mode and false in deployment mode.
From http://developer.apple.com/documentation/WebObjects/WOAppProperties/AppProperties/chapter_1_section_1.html
If the page being returned throws during appendToResponse and the app is deployed, all that is displayed is a blank page with the words "Your request produced an error".
To avoid this, either add this to the launch agruments:
-DWODisplayExceptionPages=true
Or change the main method in your Application class to look like this:
public static void main(String argv[]) {
System.setProperty("WODisplayExceptionPages", "true");
WOApplication.main(argv, Application.class);
}
This won't work if you put it in the constructor.