RE: Creating customer Exception class

I haven't been following this thread too closely, but has anyone suggested
Log4J to you?  It is built to allow for multiple levels of logging output
to various destinations (screen, log file, etc).  You can actually tune it
so that messages have varying levels of severity, and you can also
configure each destination to only emit messages of certain levels.

Basically, I would suggest that you have a centralized error handler that
decides what to do with each error it gets.  You can accomplish this via a
single class that actually handles all your errors, or you could do this
through inheritance.  When your main error handling code gets the error, it
can get information about the exception, or the classes that call this
handler can assign levels to the exception, and then your error handler can
send the error to the logging framework for processing.

If you are using JDK 1.4, you already have this capability.  You can add
this capability to JDK 1.3 by downloading Log4J from the Apache project
(http://logging.apache.org/log4j/docs/), and adding the Log4J jar(s) to
your classpath.

Chris DeLashmutt
Senior R&D Analyst
LeasePlan USA
1165 Sanctuary Pkwy., Alpharetta, GA 30004
Phone: 678-202-8695
Fax: 678-921-4895
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                      "Clapham, Paul"                                           
                                                        
                      <pclapham@core-mark        To:       "Java Programming on 
and around the iSeries / AS400"                         
                      .com>                       <java400-l@xxxxxxxxxxxx>      
                                                        
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                      java400-l-bounces@m        Subject:  RE: Creating 
customer Exception class                                        
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                      02/09/2005 06:48 PM                                       
                                                        
                      Please respond to                                         
                                                        
                      Java Programming on                                       
                                                        
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No, that sounds like a reasonable design. But it would be possible to have
"e.getMessage()" return the application's error message and
"e.getCause().getMessage()" return the actual error message. The difference
between that design and your proposed design is what happens when your
customized Exception gets handled by some generic code (e.g. error logging)
that only handles Exception. That code can't call your customized
appLevelMessage method. So if you have such a thing, then it depends on how
you want that code to behave.

PC2

-----Original Message-----
From: java400-l-bounces+pclapham=core-mark.com@xxxxxxxxxxxx
[mailto:java400-l-bounces+pclapham=core-mark.com@xxxxxxxxxxxx] On Behalf Of
Lim Hock-Chai
Sent: February 9, 2005 14:53
To: Java Programming on and around the iSeries / AS400
Subject: RE: Creating customer Exception class

Yes.  There is already a message field in the Exception class.  The reason
that I want to create an additional appLevelErrMsg is because I want to
retain everything that is in Exception.  appLevelErrMsg is more for what
the user will see.  The message in Exception class is the actual error
message that could help programmer debugging problem.  Do you think that is
redundant?

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