I've not had better luck. I think it's the way it is.
Here's how I do it - I'd like to know how others do.
I use hundreds of log messages so I can trace the flow of my program. I make the
method calls for
logging easy to type - dbmd("a debug msg") or dbmw("warning message").
I code traces into action classes from the start. to show the perform method starting
& ending so
a dud struts config is found because the Action i expect to run doesn't log it's
start.
I check for null pointers all over the place & log a warning or throw an exception for
them.
I constantly restart the server (tomcat 3.2.2) to make weird problems go away.
Auto class reloading doesn't work properly so - I restart after every compile.
I use these 3 methods in jsp's & Action classes a lot, to check the contents of the
session &
request - this finds things left in the session by mistake.
public static void printSessionAttributeNames(String caller, HttpSession
session) {
public static void printRequestAttributeNames(String caller,
HttpServletRequest request) {
public static void printRequestParameters(String caller, HttpServletRequest
request) {
I've attached the code for them, someone may find them useful - the codes a bit dodgy
& old but
it's easy to understand.
I have my own logging code (from old servlet programming) but I want to use log4j (one
day!) - You
really need to be able to switch trace messages on/off without re-compiling classes or
restarting
the server.
Only when it's quite reliable do I remove the messages. Often I just comment the
mesages out in
expectation it will go wrong in future.
All in all a bit primitive compared to some (non-web) environments I've worked in.
we're in the
early days - things will get easier. We'll get informative/instructive messages that
tell us what
to do to put it right & we'll be able to step thru our action classes in the debugger.
Happy bug hunting! - Keith
--- "Kilmer, Erich" <[EMAIL PROTECTED]> wrote:
> Thought I would give this one more try. Has anyone had better luck with
> debugging problems caused by say bad action mappings, ie: mis-named action
> classes, missing action forms etc. Currently when these problems are
> encountered I see no useful error messages in any of my logs (even when
> debug is set to 2).
> Is this just the way that it is or have I failed to do something?
>
> Thanks,
> Erich
>
> Sent previously:
>
> I have been using Struts for some time now. My app's Struts config file has
> almost 50 action mappings so I have been down this road a time or two.
> Many times when adding a new mapping I run into errors though. For example
> the latest on was where the mapping listed an action class called something
> like UserCreateAction (package removed). But when I wrote the class itself I
> named it UserAddAction.
> Now when I built the app and moved to the Orion apps server and ran it when
> I get to the JSP that references this action mapping I get a null exception.
> Typically I do not catch exceptions in a JSP and the uncaught exceptions go
> to my error JSP where it states that the exception is null.
> So I go into my web.xml file and change the debug param to 2. I also changed
> detail to 2. (By the way what does detail = 2 do?)
> Then I re-ran everything after rebuilding and re-deploying. The app still
> does the same thing.
> OK, fine now I go to check the logs. I check the apps server log where
> system outs go. I see no Struts messages except for the flurry of them at
> startup. I look at the log4j error logs and see nothing. I also looked at
> the apps servers application log where I see some Struts messages but see
> nothing about this error.
>
> So my Struts debugging question is this. Are errors encountered when
> converting the Struts tags in my JSP written anywhere? Is there more debug
> settings I must make? Is there another log that I can check?
>
> I know this is a fairly simple example and I am getting better at debugging
> them but it would be nice if there was someway to make this so I check the
> log and it says that "Action class UserCreateAction does not exist".
>
> Let me know,
> Erich Kilmer
> Bell+Howell
>
>
>
> --
> To unsubscribe, e-mail:
> <mailto:[EMAIL PROTECTED]>
> For additional commands, e-mail:
> <mailto:[EMAIL PROTECTED]>
>
> --
> To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]>
> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
>
__________________________________________________
Do You Yahoo!?
Send FREE video emails in Yahoo! Mail!
http://promo.yahoo.com/videomail/
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
public static void printSessionAttributeNames(String caller, HttpSession
session) {
Enumeration ee3 = session.getAttributeNames();
dbmd("printSessionAttributeNames: for caller: "+ caller +" -start...");
while (ee3.hasMoreElements()) {
String name = (String)ee3.nextElement();
Object object = session.getAttribute(name);
String className = object == "null" ? null :
object.getClass().getName();
dbmd(name +" of class:"+ className);
}
dbmd("printSessionAttributeNames: for caller: "+ caller +" - end");
}
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
public static void printRequestAttributeNames(String caller,
HttpServletRequest request) {
Enumeration ee2 = request.getAttributeNames();
dbmd("printRequestAttributeNames: for caller: "+ caller +" -
start...");
while (ee2.hasMoreElements()) {
String name = (String)ee2.nextElement();
Object object = request.getAttribute(name);
String className = object == "null" ? null :
object.getClass().getName();
dbmd(name +" of class:"+ className);
}
dbmd("printRequestAttributeNames: for caller: "+ caller +" - end");
}
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
public static void printRequestParameters(String caller, HttpServletRequest
request) {
Enumeration ee5 = request.getParameterNames();
dbmd("printRequestParameters: for caller: "+ caller +" - start...");
while (ee5.hasMoreElements()) {
String name = (String)ee5.nextElement();
String[] values = request.getParameterValues(name);
String print = "name: "+ name +" value(s): ";
for (int ii5 = 0; ii5 < values.length; ii5++) {
print += values[ii5];
if (ii5 < values.length - 1) {
print += ", ";
}
}
dbmd(print);
}
dbmd("printRequestParameters: for caller: "+ caller +" - end");
}
--
To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]>
For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
