Java user-defined transaction management not working correctly???

Question

Hi everyone,
I have encountered a problem when using Java user-defined transaction management in my session bean. It threw an exception but I could not work out what that means. Could anyone comment on this? Thanks.
This BrokerBean is a stateless session calling other entities bean to perform some simple operations. There are 2 Cloudscape databases in use. Invoices (EB) use InvoiceDB and all the other EBs use StockDB.
If I comment out the user-defined transaction management code, then everything works fine. Or if I comment out the Invoices EB code, it is fine as well. It seemed to me that there is something wrong in transaction management when dealing with distributed databases.
--------------- source code ----------------------
public void CreateInvoices(int sub_accno) {
try {
utx = context.getUserTransaction();
utx.begin();
SubAcc subAcc = subAccHome.findByPrimaryKey(new SubAccPK(sub_accno));
String sub_name = subAcc.getSubName();
String sub_address = subAcc.getSubAddress();
Collection c = stockTransHome.findBySubAccno(sub_accno);
Iterator i = c.iterator();
ArrayList a = new ArrayList();
while (i.hasNext()) {
StockTrans stockTrans = (StockTrans)i.next();
int trans_id = stockTrans.getTransID();
String tran_type = stockTrans.getTranType();
int stock_id = stockTrans.getStockID();
float price = stockTrans.getPrice();
Invoices invoices = invoicesHome.create(sub_accno, sub_name, sub_address, trans_id, stock_id, tran_type, price);
stockTrans = stockTransHome.findByPrimaryKey(new StockTransPK(trans_id));
stockTrans.remove();
utx.commit();
utx = null;
} catch (Exception e) {
if (utx != null) {
try {
utx.rollback();
utx = null;
catch (Exception ex) {}
// e.printStackTrace();
throw new EJBException("BrokerBean.CreateInvoices(): " + e.getMessage());
--------------- exception ----------------------
Initiating login ...
Enter Username:
Enter Password:
Binding name:`java:comp/env/ejb/BrokerSB`
EJB test succeed
Test BuyStock!
Test BuyStock!
Test BuyStock!
Test BuyStock!
Test SellStock!
Test SellStock!
Caught an exception.
java.rmi.ServerException: RemoteException occurred in server thread; nested exce
ption is:
java.rmi.RemoteException: BrokerBean.CreateInvoices(): CORBA TRANSACTION
_ROLLEDBACK 9998 Maybe; nested exception is:
org.omg.CORBA.TRANSACTION_ROLLEDBACK: vmcid: 0x2000 minor code: 1806
completed: Maybe
at com.sun.corba.ee.internal.iiop.ShutdownUtilDelegate.mapSystemExceptio
n(ShutdownUtilDelegate.java:64)
at javax.rmi.CORBA.Util.mapSystemException(Util.java:65)
at BrokerStub.CreateInvoices(Unknown Source)
at Client.main(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sun.enterprise.util.Utility.invokeApplicationMain(Utility.java:22
9)
at com.sun.enterprise.appclient.Main.main(Main.java:155)
Caused by: java.rmi.RemoteException: BrokerBean.CreateInvoices(): CORBA TRANSACT
ION_ROLLEDBACK 9998 Maybe; nested exception is:
org.omg.CORBA.TRANSACTION_ROLLEDBACK: vmcid: 0x2000 minor code: 1806
completed: Maybe
at com.sun.enterprise.iiop.POAProtocolMgr.mapException(POAProtocolMgr.ja
va:389)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:43
1)
at BrokerBean_EJBObjectImpl.CreateInvoices(BrokerBean_EJBObjectImpl.java
:265)
at BrokerBeanEJBObjectImpl_Tie._invoke(Unknown Source)
at com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatchToServant(Ge
nericPOAServerSC.java:520)
at com.sun.corba.ee.internal.POA.GenericPOAServerSC.internalDispatch(Gen
ericPOAServerSC.java:210)
at com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatch(GenericPOAS
erverSC.java:112)
at com.sun.corba.ee.internal.iiop.ORB.process(ORB.java:255)
at com.sun.corba.ee.internal.iiop.RequestProcessor.process(RequestProces
sor.java:84)
at com.sun.corba.ee.internal.orbutil.ThreadPool$PooledThread.run(ThreadP
ool.java:99)

Answer 1

Three things:
first, maybe you should think of putting ut.begin() just before the invoicesHome.create() method and ut.commit() just after the stockTrans.remove() method.It wont solve the current problem but will help in performance once the problem is solved.
second, your utx.commit() is outside the try block. how come the code is compiling then??
third, try doing a SOP call before and after invoicesHome.create() method and see where the problem actually lies.
let us know...
Hi SteveW2,
Thanks for being so helpful. Here are my replies:
Can I just ask why you're not using containermanaged
transactions?The reason why I didn't use container managed
transactions is because I don't really know how to do
that. I am more familiar with this user-defined
transaction handling.
I have attempted to implement the same method in an
entity bean and just let the container manage the
rollback itself. The same exception was thrown when
running the client.
Also, the transaction behaviour is likely to relateto
the app server youre using - which is it?What do you mean by the app server? I am using J2EE
1.3.1 if that is what you meant.
Finally, if your code has a problem rolling back,and
throws an exception, you discard your exception
thereby losing useful information.I have tried to print the exception stack as well, but
it is the same as just printing the general
exception.
This problem is very strange cause if I comment out
the transaction management thing, then everything
works fine. Or if I am only working with 1 single
database, with this user-defined transaction handling,
everything works fine as well.
Here is the error log from J2EE server if you are
interested.
------------ error log ---------------
javax.ejb.TransactionRolledbackLocalException:
Exception thrown from bean; nested exception is:
javax.ejb.EJBException: ejbCreate: Connection
previously closed, open another Connection
javax.ejb.EJBException: ejbCreate: Connection
previously closed, open another Connection
     at InvoicesBean.ejbCreate(Unknown Source)
at
InvoicesBean_RemoteHomeImpl.create(InvoicesBean_Remote
omeImpl.java:31)
     at InvoicesHomeStub.create(Unknown Source)
     at BrokerBean.CreateInvoices(Unknown Source)
at
BrokerBean_EJBObjectImpl.CreateInvoices(BrokerBean_EJB
bjectImpl.java:261)
at BrokerBeanEJBObjectImpl_Tie._invoke(Unknown
Source)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispa
chToServant(GenericPOAServerSC.java:520)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.inter
alDispatch(GenericPOAServerSC.java:210)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispa
ch(GenericPOAServerSC.java:112)
at
com.sun.corba.ee.internal.iiop.ORB.process(ORB.java:25
at
com.sun.corba.ee.internal.iiop.RequestProcessor.proces
(RequestProcessor.java:84)
at
com.sun.corba.ee.internal.orbutil.ThreadPool$PooledThr
ad.run(ThreadPool.java:99)
javax.ejb.TransactionRolledbackLocalException:
Exception thrown from bean; nested exception is:
javax.ejb.EJBException: ejbCreate: Connection
previously closed, open another Connection
at
com.sun.ejb.containers.BaseContainer.checkExceptionCli
ntTx(BaseContainer.java:1434)
at
com.sun.ejb.containers.BaseContainer.postInvokeTx(Base
ontainer.java:1294)
at
com.sun.ejb.containers.BaseContainer.postInvoke(BaseCo
tainer.java:403)
at
InvoicesBean_RemoteHomeImpl.create(InvoicesBean_Remote
omeImpl.java:37)
     at InvoicesHomeStub.create(Unknown Source)
     at BrokerBean.CreateInvoices(Unknown Source)
at
BrokerBean_EJBObjectImpl.CreateInvoices(BrokerBean_EJB
bjectImpl.java:261)
at BrokerBeanEJBObjectImpl_Tie._invoke(Unknown
Source)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispa
chToServant(GenericPOAServerSC.java:520)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.inter
alDispatch(GenericPOAServerSC.java:210)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispa
ch(GenericPOAServerSC.java:112)
at
com.sun.corba.ee.internal.iiop.ORB.process(ORB.java:25
at
com.sun.corba.ee.internal.iiop.RequestProcessor.proces
(RequestProcessor.java:84)
at
com.sun.corba.ee.internal.orbutil.ThreadPool$PooledThr
ad.run(ThreadPool.java:99)
What is "connection previously closed, open another
connection"? This might be the cause of the
exception.
I'll keep trying till I solve the problem.
Thanks,
Sasuke