If you get a ClassCastException yet the object seems to be of the
correct class name, then it looks like a class loader issue (multiple
versions of the same class on the classpath). Otherwise if it was a
serialization issue, you wouldn't get an object you can inspect.
On 4/30/07, nlif <[EMAIL PROTECTED]> wrote:
Hi all,
We have a strange problem, maybe someone has seen this or has an idea:
In our MessageListener, we cast the Message into ObejctMessage, and then
call getObject() to get the actual object we sent. Upon trying to cast the
object to the proper class (SendMobileNotification), we get a
ClassCastException. To make things even more strange, this is sporadic: it
doesn't always happen, and we can't figure out the exact circumstances under
which it does happen.
Here is the relevant code:
public void onMessage(Message message) {
try {
ObjectMessage objectMessage = (ObjectMessage) message;
Serializable object = objectMessage.getObject();
logger.debug("Message SHOULD BE type: " +
SendMobileNotification.class.getName() + " [hashcode=" +
SendMobileNotification.class.hashCode() + " , serialVersionUID=" +
SendMobileNotification.serialVersionUID + "]");
logger.debug("Message IS type: " +
object.getClass().getName() + "
[hashcode=" + object.getClass().hashCode() + "]");
SendMobileNotification sendMobileNotification =
(SendMobileNotification)
(object); // this line throws ClassCastException
And here's what's written to the log:
DEBUG - Message SHOULD BE type: com.softcom.messages.SendMobileNotification
[hashcode=4050691 , serialVersionUID=-11111111111111]
DEBUG - Message IS type: com.softcom.messages.SendMobileNotification
[hashcode=31922829]
Is this an ActiveMQ issue?
Is this a class loader issue? If so, how can something like this happen?
Is it related to Serialization?
Any help will be appreciated.
Thanks,
Naaman
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James
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