如何解决由于循环内大量数据库调用而导致的事务超时 - EJB

Question

As described in the topic the total timeout is 120s, it exceeds when processing the transaction. Implementations is like below psuedocode.

Original idea is to take the methodA out of tx context using TransactionAttributeType.NOT_SUPPORTED and move the costly db method call to a REQUIRES_NEW (New transaction). But it's quite hectic considering the implmentation of method A. and the db proc is already optimized to a best of ability.

Is there any workaround for this :) Really appreciated

public String methodA(x){
 String resp;
    ------ other implementations
    
    if(x==10){
    
        for(int k; k < 10 ; k++){
            dbcall() --- method with heavy db proc which costs around 15seconds
        }
    }
    ------ other implementations

   return resp;
}

UPDATE : changing the timeout duration is not an option

Answer 1

For Bean Managed Transactions, you can use the method setTransactionTimeout of the UserTransaction interface to set the timeout, for Container Managed Transactions, server specific configurations should be used (ie for JBOSS, you can use the annotation org.jboss.ejb3.annotation.TransactionTimeout).

Example:

    @TransactionTimeout(unit=TimeUnit.MINUTES, value=10)
    public void doAction() {
    

The doAction method transaction will be valid for maximum 10 minutes, the same can be handled with the following on bean managed transactions:

    public void doAction() {
        try {
            ut.setTransactionTimeout(60 * 10);
            ut.begin();

Note that the method takes the parameters as seconds (ie 10 minutes = 10 * 60).

Resource

Resource 2