CoimbatoreArchive for April 2014
EJB Transaction Management
Cannot use an EntityTransaction while using JTA
I found this was useful to fix that scenario Cannot use an
EntityTransaction while using JTA.
Bean Managed Transactions
In Bean Managed Transactions, Transactions can be managed by handling exceptions at application level. Following are the key points to be considered
- Start - When to start a transaction in a business method.
- Sucess - Identify success scenario when a transaction is to be committed.
- Failed - Identify failure scenario when a transaction is to be rollback.
Example
package com.tutorialspoint.txn.bmt;
import javax.annotation.Resource;
import javax.ejb.Stateless;
import javax.ejb.TransactionManagement;
import javax.ejb.TransactionManagementType;
import javax.transaction.UserTransaction;
@Stateless
@TransactionManagement(value=TransactionManagementType.BEAN)
public class AccountBean implements AccountBeanLocal {
@Resource
private
UserTransaction userTransaction;
public void
transferFund(Account fromAccount, double fund ,
Account
toAccount) throws Exception{
try{
userTransaction.begin();
confirmAccountDetail(fromAccount);
withdrawAmount(fromAccount,fund);
confirmAccountDetail(toAccount);
depositAmount(toAccount,fund);
userTransaction.commit();
}catch
(InvalidAccountException exception){
userTransaction.rollback();
}catch
(InsufficientFundException exception){
userTransaction.rollback();
}catch
(PaymentException exception){
userTransaction.rollback();
}
}
private void
confirmAccountDetail(Account account)
throws
InvalidAccountException {
}
private void
withdrawAmount() throws InsufficientFundException {
}
private void
depositAmount() throws PaymentException{
}
}
In this example, we made use of UserTransaction interface to mark beginning of transaction usinguserTransaction.begin() method call. We mark completion of transaction by usinguserTransaction.commit() method and if any exception occured during transaction then we rollback the complete transaction using userTransaction.rollback() method call.
Reference : http://www.tutorialspoint.com/ejb/ejb_transactions.htm
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