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Version 1.1 by smmccraw on 2007/07/08 09:45
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1 == Exception Page ==
2
3 To provide a custom error handler when an exception is thrown, override the method:
4
5 {{panel}}
6
7 public WOResponse handleException (java.lang.Exception anException, WOContext aContext) { }
8
9 {{/panel}}
10
11 For example:
12
13 {{panel}}
14
15 public WOResponse handleException(Exception _exception, WOContext _context) {
16 Session session = (Session) _context.session();
17 // do something to notify user of exception, maybe put a message in the session here ...
18 WOResponse response;
19 if (/* you can't handle exception*/) {
20 response = super.handleException(_exception, _context);
21 }
22 else {
23 response = pageWithName(YourExceptionPage.class.getName(), _context).generateResponse();
24 }
25 return response;
26 }
27
28 {{/panel}}
29
30 == Session Expired ==
31
32 To provide a custom error handler when an exception is thrown, override the method:
33
34 {{panel}}
35
36 public WOResponse handleSessionRestorationErrorInContext(WOContext _context) {
37
38 {{/panel}}
39
40 For example:
41
42 {{panel}}
43
44
45 public WOResponse handleSessionRestorationErrorInContext(WOContext _context) {
46 Session session = (Session) _context.session();
47 // do something to notify user of exception, maybe put a message in the session here ...
48 WOResponse response = pageWithName(YourErrorPage.class.getName(), _context).generateResponse();
49 return response;
50 }
51
52 {{/panel}}
53
54 == Your Request Produced an Error ==
55
56 === Chuck Hill ===
57
58 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:
59
60 WODisplayExceptionPages
61 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.
62
63 From http:~/~/developer.apple.com/documentation/WebObjects/WOAppProperties/AppProperties/chapter_1_section_1.html
64
65 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".
66
67 To avoid this, either add this to the launch agruments:
68
69 {{panel}}
70
71 -DWODisplayExceptionPages=true
72
73 {{/panel}}
74
75 Or change the main method in your Application class to look like this:
76
77 {{panel}}
78
79 public static void main(String argv[]) {
80 System.setProperty("WODisplayExceptionPages", "true");
81 WOApplication.main(argv, Application.class);
82 }
83
84 {{/panel}}
85
86 This won't work if you put it in the constructor.
87
88 Category:WebObjects