docs: public Connection getFrom() {
          final List<Connection> list =
              getIncomingConnections(org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE);
          if (list.size() == 0) {
              return null;
          }
          if (list.size() == 1) {
          	return list.get(0);
          }
          if ("true".equals(System.getProperty("jbpm.enable.multi.con"))) { 
          	return list.get(0);
          } else {
          	throw new IllegalArgumentException(
      		"Trying to retrieve the from connection but multiple connections are present");
          }
      }