Transactions over multiple application servers

Question

Hello,
we have following situation.
We have a bunch of core services deployed on a central application server and some applications deployed on individual application servers.
The services are developed as normal remote interfaces.
The core service interfaces have special annotations, so the service locator knows, that he has to lookup them on other servers.
Now we have the following case:
This code is executed in application server 1.
Service2 is deployed in application server 2 and Service3 in application server 3.
public void doSomething() {
        ServiceLocator locator = ServiceLocator.getInstance();
        Service2 service2 = locator.getService(Service2.class);
        service2.doSomething();
        Service3 service3 = locator.getService(Service3.class);
        service3.doSomething();
}Each of the calls to service2 and service3 performs some database operations.
But, if service3.doSomething() fails, the database operations done by service2.doSomething() are not rolled back. (no surprise)
What do we have to do, so that the service2 operations are also rolled back on service3 failures?
Thanks
Dirk

Answer 1

Doesn't work... :(
Here my sample code:
Service1 (deployed on AS1)
@TransactionAttribute(TransactionAttributeType.REQUIRED)
    public void doSomething() {
        Logger.getLogger(getClass().getName()).info("doSomething");
        ServiceLocator locator = ServiceLocator.getInstance();
        Service1Entity entity = new Service1Entity();
        entityManager.persist(entity);
        Service2 service2 = locator.getService(Service2.class);
        service2.doSomething();
        Service3 service3 = locator.getService(Service3.class);
        service3.doSomething();
    }Service2 (deployed on AS2)
@TransactionAttribute(TransactionAttributeType.MANDATORY)
    public void doSomething() {
        Logger.getLogger(getClass().getName()).info("doSomething");
        Service2Entity entity = new Service2Entity();
        entityManager.persist(entity);
    }Service3 (deployed on AS3)
@TransactionAttribute(TransactionAttributeType.MANDATORY)
    public void doSomething() {
        Logger.getLogger(getClass().getName()).info("doSomething");
        Service3Entity entity = new Service3Entity();
        entity.setUuid("Bang");
        entityManager.persist(entity);
    }Each service has a XA datasource configured. The all access the same database.
But when I call service1.doSomething(), I get a javax.ejb.EJBTransactionRequiredException from service 2.
Does somebody has an idea?
thanks
Dirk