Thanks guys! Upon closer scrutiny, I discovered that it was a NoClassDefFoundError thrown by the Class Loader. Since it is of a superclass Error, not Exception, it naturally causes the thread to exit, and it is of course not caught by my try/catch.
I guess working 12 hr days on the production issue I can't reproduce locally will do that to you.
"Thou Shall Not Stress, Take a Walk, and Then Look Carefully at Yonder Stack Trace."
-- that is the lesson in this fable!
:-)
Thanks again to all who replied,
Greg
-----Original Message-----
From: Spencer W. Thomas [mailto:[EMAIL PROTECTED]]
Sent: Saturday, November 30, 2002 7:55 AM
To: JDJList
Subject: [jdjlist] Re: ClassNotFoundException
ClassNotFoundException is thrown when a class is loaded. The class may
be loaded well before your code ever gets control, because it is
referred to from another class, which is referred to from another class,
...
A common cause of CNFE, in my experience, is that a static initializer
throws an exception. We have a number of classes in our system that
initialize static members using properties loaded from a resource file.
If the property value is not set in the resource file (or if the
resource file is missing), the intializer throws a
"MissingResourceException", which is translated to a
ClassNotFoundException or NoClassDefFoundError. Depending on the chain
of "extends" and on which classes have static intializers, some of which
may cause other classes to be loaded, the exception can be thrown even
before your "main" is called.
What does your stack trace look like? Is it really
ClassNotFoundException, or is it perhaps NoClassDefFoundError, which
does not inherit from Exception? ClassNotFoundException, according to
the documentation, is thrown only from the following methods:
* The |forName| method in class |Class|.
* The |findSystemClass| method in class |ClassLoader| .
* The |loadClass| method in class |ClassLoader|.
NoClassDefFoundError is thrown "if the Java Virtual Machine or a
classloader tries to load in the definition of a class (as part of a
normal method call or as part of creating a new instance using the |new|
expression) and no definition of the class could be found."
=Spencer
Greg Nudelman wrote:
> Guys, I have a thread that throws a ClassNotFoundException, from the
> class loader. This causes the entire thread to die, right then and
> there, even though a wrapper method catches all java.lang.Exception,
> though that catch block there never gets executed.
>
> I think this should not occur -- bug in JVM? Your experiences?
>
> Please share.
>
> Greg
>
> Solaris, JVM 1.3.1_06
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