UnmarshalException (ClassNotFoundException) on the presentation tier

Hi!
We experience a problem when throwing application exceptions from a session bean
in one cluster to the client, implemented as a servlet running in another cluster.
We currently use WLS 6.1 SP1.
When the session bean throws a "home grown" subclass of java.lang.Exception, the
presentation tier never receives the exception. Instead, a ClassNotFoundException
occurs and is thrown as an UnmarshalException. The specific exception class IS available
to the web application class loader. There are no problems with returning instances
of our own classes from the session bean to the web application.
I am pretty sure that the problem can be solved by including the exception classes
in the system classpath. This is however not an option, as the classes may exist
in several version across projects deployed on the cluster. Also I suspect that our
platform people will not accept that we enable network class loading on the presentation
server.
Are there any other solutions to this problem (which do not involve a redesign of
our services).
Best regards,
Jesper

Just to follow up: I have now tried with NetworkClassLoadingEnabled="true". This no
longer results in a ClassNotFoundException. However, the network loaded class is
not compatible with the class already known in the web tier.
Any suggestions are welcome...
Regards,
Jesper
"Ade Barkah" <[email protected]> wrote:
The reason I ask is that one would expect a ClassCastException instead of
a
ClassNotFoundException if the client has an incompatible copy? However,
going back through this newsgroup's achives, I see there have been a few
others
intermittently experiencing what you're seeing, none with solutions.
Since the client can already "see" the class, I doubt putting it in the
system
classpath would solve it? Network classloading should, but as you say it
may not be acceptable. I'll try to do some further digging here when I have
time... sorry I can't help further.
regards,
-Ade
"Jesper Kamstrup Linnet" <[email protected]> wrote in message
news:[email protected]...
Hi Ade,
Yes, I know for sure that it works on the presentation tier since theweb
application
uses the same exception class internally.
Regards,
Jesper
"Ade Barkah" <[email protected]> wrote:
Jesper,
Can you verify that the exception class (and not merely its
interface/definition) is available to the
client app? I.e., if from the client code you do a "Exception test =
new
HomeGrownException()"
will it work at runtime??
regards,
-Ade
<Jesper Kamstrup Linnet jesper.linnet> wrote in message
news:[email protected]...
Hi!
We experience a problem when throwing application exceptions from asession bean
in one cluster to the client, implemented as a servlet running in
another
cluster.
We currently use WLS 6.1 SP1.
When the session bean throws a "home grown" subclass ofjava.lang.Exception, the
presentation tier never receives the exception. Instead, aClassNotFoundException
occurs and is thrown as an UnmarshalException. The specific exceptionclass IS available
to the web application class loader. There are no problems with
returning
instances
of our own classes from the session bean to the web application.
I am pretty sure that the problem can be solved by including the
exception
classes
in the system classpath. This is however not an option, as the classesmay
exist
in several version across projects deployed on the cluster. Also I
suspect
that our
platform people will not accept that we enable network class loading
on
the presentation
server.
Are there any other solutions to this problem (which do not involve
a
redesign of
our services).
Best regards,
Jesper

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