Need help with ClassCastException with Jboss

2004-10-24 20:26:35,125 INFO [STDOUT] [Flex] Exception when invoking service: data-service
with message: Flex Message (flex.data.messages.DataMessage)
operation = transacted
id = null
clientId = 81828BBA-8E7A-B668-86B3-76D34BF1071F
correlationId =
destination = utente.hibernate
messageId = ADE53343-F3F1-D938-A31D-CC308E3F66B1
timestamp = 1098642394734
timeToLive = 0
body =
[
Flex Message (flex.data.messages.DataMessage)
operation = create_and_sequence
id = ASObject(19507034){id=2004901826687}
clientId = 43BC3541-8881-F29B-B186-CC3039979243
correlationId = ADE53343-F3F1-D938-A31D-CC308E3F66B1
destination = utente.hibernate
messageId = 59933554-59E2-8624-EA5B-CC308E3F279A
timestamp = 0
timeToLive = 0
body = fdspack.Utente@1da5d65
]
hdr(DSEndpoint) = my-rtmp
exception: flex.data.DataServiceException: Unable to access UserTransaction in DataService.
2004-10-24 20:26:35,125 INFO [STDOUT] [Flex] Error handling rtmp message: flex.data.DataServiceException: Unable to access UserTransaction in DataService.
incomingMessage: Flex Message (flex.data.messages.DataMessage)
operation = transacted
id = null
clientId = 81828BBA-8E7A-B668-86B3-76D34BF1071F
correlationId =
destination = utente.hibernate
messageId = ADE53343-F3F1-D938-A31D-CC308E3F66B1
timestamp = 1098642394734
timeToLive = 0
body =
[
Flex Message (flex.data.messages.DataMessage)
operation = create_and_sequence
id = ASObject(19507034){id=2004901826687}
clientId = 43BC3541-8881-F29B-B186-CC3039979243
correlationId = ADE53343-F3F1-D938-A31D-CC308E3F66B1
destination = utente.hibernate
messageId = 59933554-59E2-8624-EA5B-CC308E3F279A
timestamp = 0
timeToLive = 0
body = fdspack.Utente@1da5d65
]
hdr(DSEndpoint) = my-rtmp
errorReply: Flex Message (flex.messaging.messages.ErrorMessage)
clientId = null
correlationId = ADE53343-F3F1-D938-A31D-CC308E3F66B1
destination = utente.hibernate
messageId = 81828F75-2508-726A-7B40-2ECD5E71CF75
timestamp = 1098642395125
timeToLive = 0
body = null
code = Server.Processing
message = Unable to access UserTransaction in DataService.
details = null
rootCause = java.lang.ClassCastException: org.jboss.tm.usertx.client.ServerVMClientUserTransaction cannot be cast to javax.transaction.UserTransaction
body = null
extendedData = null
2004-10-24 20:26:35,125 INFO [STDOUT] [Flex] cause=java.lang.ClassCastException: org.jboss.tm.usertx.client.ServerVMClientUserTransaction cannot be cast to javax.transaction.UserTransaction type=class java.lang.ClassCastException
java.lang.ClassCastException: org.jboss.tm.usertx.client.ServerVMClientUserTransaction cannot be cast to javax.transaction.UserTransaction
at flex.data.DataServiceTransaction.doBegin(DataServiceTransaction.java:653)
at flex.data.DataServiceTransaction.begin(DataServiceTransaction.java:624)
at flex.data.DataService.serviceTransactedMessage(DataService.java:474)
at flex.data.DataService.serviceMessage(DataService.java:241)
at flex.messaging.MessageBroker.routeMessageToService(MessageBroker.java:548)
at flex.messaging.endpoints.AbstractEndpoint.serviceMessage(AbstractEndpoint.java:302)
at flex.messaging.endpoints.rtmp.AbstractRTMPServer.dispatchMessage(AbstractRTMPServer.java: 682)
at flex.messaging.endpoints.rtmp.NIORTMPConnection$RTMPReader.run(NIORTMPConnection.java:665 )
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPo olExecutor.java:665)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolEx ecutor.java:690)
at java.lang.Thread.run(Thread.java:619)
2004-10-24 20:26:35,140 INFO [STDOUT] [Flex] Serializing AMF/RTMP response
Version: 3
(Command method=_error (0) trxId=17)
(Typed Object #0 'flex.messaging.messages.ErrorMessage')
headers = (Object #1)
rootCause = (Typed Object #2 'java.lang.ClassCastException')
message = "org.jboss.tm.usertx.client.ServerVMClientUserTransaction cannot be cast to javax.transaction.UserTransaction"
localizedMessage = "org.jboss.tm.usertx.client.ServerVMClientUserTransaction cannot be cast to javax.transaction.UserTransaction"
cause = null
body = null
correlationId = "ADE53343-F3F1-D938-A31D-CC308E3F66B1"
faultDetail = null
faultString = "Unable to access UserTransaction in DataService."
clientId = null
timeToLive = 0.0
destination = "utente.hibernate"
timestamp = 1.098642395125E12
extendedData = null
faultCode = "Server.Processing"
messageId = "81828F75-2508-726A-7B40-2ECD5E71CF75"


Any ideas on what could be the cause of this???

As long as I ask for data from the server i get no issues, but as soon as I try to create a new item or modify an existing one i get this...maybe a configuration error?

Please help me, I need this for my degree!!!

Riccardo