#fixed code
                                public void setConnection(BusURL url) {
        disconnect();

        this.url = url;

        rawConnection = new RAWConnection(url);
        bcmConnection = new BCMConnection(url);

        rawConnection.setReceiver(rawReceiver);
        bcmConnection.setReceiver(bcmReceiver);

        notifyListenersConnection();
    }
#vulnerable code 
                                public void setConnection(BusURL url) {
        disconnect();
        
        this.url = url;

        rawConnection = new RAWConnection(url);
        bcmConnection = new BCMConnection(url);

        rawConnection.setReceiver(rawReceiver);
        bcmConnection.setReceiver(bcmReceiver);

        notifyListenersConnection();
    } 
                            #location 4 
                            #vulnerability type THREAD_SAFETY_VIOLATION