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Logging success of transaction from EJB
public class MyEjb {

  @Inject
  AnotherEjb anotherEjb;

  @Inject
  LoggerEjb logger;

  public void doSomeThing() {
     MyBean b = getSomething();
     anotherEjb.persistSg(b);

     /* logger.log is transaction if of attrubute NOT_SUPPORTED to
        ensure separation from caller transaction */
     logger.log("Did something successfully.");
  }

}

public class AnotherEjb {

  @Inject
  EntitiyManager em;

  public void persistSg(MyBean entity) {
    em.persist(entity);
  }
}