javax.ejb.EJBException: Second thread call to stateful session bean

[karim]

Hi axis users,
I'm new to Axis and I've got a problem using it.
I would like to know if someone had already experimented it :
In a nutshell, I've created and deployed a service S1 that acts like a 
mediator.
This service creates and use a stateful session EJB E1.

When my client C1 invoke one method of the service, everything works 
well and data added by C1 are saved during the session.
To do so, I had to add in my wsdl file the line 
 <parameter name="scope" value="Application"/>
in order to let my service acting like a singleton(if not, it calls 
always  the default constructor).

So, with only one client, my app works well.
I wanted to test it with two client so I ran 2 threads corresponding to 
2 different  clients and  I got the following error :
AxisFault
faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException
faultSubcode:
faultString: javax.ejb.EJBException: Second thread call to stateful 
session bean
faultActor:
faultNode:
faultDetail:
       {http://xml.apache.org/axis/}stackTrace:AxisFault
faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException
faultSubcode:
faultString: javax.ejb.EJBException: Second thread call to stateful 
session bean
faultActor:
faultNode:
faultDetail:
javax.ejb.EJBException: Second thread call to stateful session bean
       at 
org.apache.axis.message.SOAPFaultBuilder.createFault(SOAPFaultBuilder.java:262)
       at 
org.apache.axis.message.SOAPFaultBuilder.endElement(SOAPFaultBuilder.java:169)
       at 
org.apache.axis.encoding.DeserializationContextImpl.endElement(DeserializationContextImpl.java:1092)
...

It seems that there'is only one session for all the users.
I think that the fact that my service is declared like a Singleton may 
be the cause of this error but I'm not sure.

It seems that my app acts like this :
C1 -----     |
            |---|----S1----E1
C2 -----     |
        local  |  Server
But I would rather that it acts like that :
C1 --------|----S1-----E1
                 |
C2 --------|----S2-----E2
        local  |  Server
And S1 and S2 acts like Singleton but only in there Session.
If someone already experiments this problem,
I would be glad to know how he solved it...
Cheers,
Karim