November 2002
Intermediate to advanced
464 pages
14h 34m
English
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Tying Up the Loose Ends
Before we leave the topic of exception handling, there are several special cases that we should discuss. Each one of these is unique, and you may or may not need them in your applications.
Handling Remote Exceptions
Remote Java objects are allowed to
throw instances of java.rmi.RemoteException. In
fact, every EJB method that is exposed to a remote client must
declare that it throws
RemoteException
.
Dealing with RemoteExceptions is very similar to
handling system exceptions except that they are not descendants of
either java.lang.Error or
java.lang.RuntimeException.
Often, the application will not be able to recover from a
RemoteException and will have to display the
system error page. If you’re using EJB and you get a
RemoteException, you can attempt to recover by
acquiring a new remote reference, but there’s
probably some type of programming or environment error that will
prevent the end user from continuing. Whether you’re
using a programmatic or a declarative approach,
you’ll likely want to log the exception, create and
store an ActionError object, and then forward to
the system error page. You can also define the exception-handling
behavior to forward the user back to the previous page and give her
the choice of trying again. If some type of network blip caused the
remote exception, it may be possible for the user to continue to use
the application.
Exceptions in Custom Tags
JSP
custom tags usually throw
JSPException
objects or one of their descendants. ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.