#vulnerable code 
                                public void updateChannelConfiguration(UpdateChannelConfiguration updateChannelConfiguration, byte[]... signers) throws TransactionException, InvalidArgumentException {

        updateChannelConfiguration(updateChannelConfiguration, getRandomOrderer(), signers);

    } 
                            #location 3 
                            #vulnerability type THREAD_SAFETY_VIOLATION
#fixed code
                                public void updateChannelConfiguration(UpdateChannelConfiguration updateChannelConfiguration, byte[]... signers) throws TransactionException, InvalidArgumentException {

        updateChannelConfiguration(client.getUserContext(), updateChannelConfiguration, getRandomOrderer(), signers);

    }