我的应用程序中的java.util.concurrentmodificationexception

Question

帮助我找出发生异常的原因。我的应用程序在启动时工作正常，但过了一会儿它停止工作，我的代码有什么不对。

ModbusTCPTransaction trans = new ModbusTCPTransaction(con);
        Runnable r = new Runnable(){
            @Override
            public void run() {
                while(isRunning){

                    try {

                        Thread.sleep(10);
                        trans.setRequest(req);

                        trans.execute();
                        ReadMultipleRegistersResponse res = (ReadMultipleRegistersResponse) trans.getResponse();
                        tf1.setText(String.valueOf(res.getRegisterValue(0)));
                        tf2.setText(String.valueOf(res.getRegisterValue(1)));
                        tf3.setText(String.valueOf(res.getRegisterValue(2)));
                    } catch (InterruptedException ex) {
                        Logger.getLogger(Modbusconn.class.getName()).log(Level.SEVERE, null, ex);
                    } catch (ModbusSlaveException ex) {
                        Logger.getLogger(Modbusconn.class.getName()).log(Level.SEVERE, null, ex);
                    } catch (ModbusException ex) {
                        Logger.getLogger(Modbusconn.class.getName()).log(Level.SEVERE, null, ex);
                    } catch (Exception ex) {
                        Logger.getLogger(Modbusconn.class.getName()).log(Level.SEVERE, null, ex);

                    }
                }
            }
        };

            new Thread(r).start();