docs: @Override
      public synchronized void addAssociation() {
          final boolean traceOn = TraceComponent.isAnyTracingEnabled();
  
          if (traceOn && tc.isEntryEnabled())
              Tr.entry(tc, "addAssociation");
  
          if (_activeAssociations > _suspendedAssociations) {
              if (traceOn && tc.isDebugEnabled())
                  Tr.debug(tc, "addAssociation received incoming request for active context");
              try {
                  setRollbackOnly();
              } catch (Exception ex) {
                  FFDCFilter.processException(ex, "com.ibm.ws.Transaction.JTA.TransactionImpl.addAssociation", "1701", this);
                  if (traceOn && tc.isDebugEnabled())
                      Tr.debug(tc, "setRollbackOnly threw exception", ex);
                  // swallow this exception
              }
  
              if (traceOn && tc.isEntryEnabled())
                  Tr.exit(tc, "addAssociation throwing rolledback");
              throw new TRANSACTION_ROLLEDBACK("Context already active");
          }
  
          stopInactivityTimer();
          _activeAssociations++;
  
          if (traceOn && tc.isEntryEnabled())
              Tr.exit(tc, "addAssociation");
      }