code: public void pushCallbackBeanO(BeanO bean) // d662032
      throws CSIException
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
              Tr.debug(tc, "pushCallbackBeanO: " + bean);
  
          HandleListInterface hl = bean.reAssociateHandleList();
  
          ivHandleListContext.beginContext(hl);
          ivCallbackBeanOStack.push(bean);
      }
docs: Updates the bean that the container is currently processing via a
  business method or lifecycle callback, and establishes a thread context
  specific to the bean.
  
  @throws CSIException if an exception occurs while reassociating handles