iothub/device/iot-device-client/src/main/java/com/microsoft/azure/sdk/iot/device/exceptions/MultiplexingClientRegistrationException.java [60:85]:
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    public void addRegistrationException(String deviceId, Exception registrationException)
    {
        Objects.requireNonNull(registrationException, "registrationException cannot be null");
        if (deviceId == null || deviceId.isEmpty())
        {
            throw new IllegalArgumentException("DeviceId cannot be null or empty");
        }

        registrationExceptions.put(deviceId, registrationException);
    }

    /**
     * Get the exception for each device that failed to register.
     * @return A map containing the deviceId's that failed to register mapped to the exception that explains why they failed to register.
     */
    public Map<String, Exception> getRegistrationExceptions() {
        return registrationExceptions;
    }

    /**
     * Sets the full registrations exception map. This will overwrite any previously saved mappings.
     * @param registrationExceptions the new full registrations exception map.
     */
    public void setRegistrationExceptionsMap(Map<String, Exception> registrationExceptions)
    {
        this.registrationExceptions = registrationExceptions;
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iothub/device/iot-device-client/src/main/java/com/microsoft/azure/sdk/iot/device/transport/MultiplexingDeviceUnauthorizedException.java [65:90]:
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    public void addRegistrationException(String deviceId, Exception registrationException)
    {
        Objects.requireNonNull(registrationException, "registrationException cannot be null");
        if (deviceId == null || deviceId.isEmpty())
        {
            throw new IllegalArgumentException("DeviceId cannot be null or empty");
        }

        registrationExceptions.put(deviceId, registrationException);
    }

    /**
     * Get the exception for each device that failed to register.
     * @return A map containing the deviceId's that failed to register mapped to the exception that explains why they failed to register.
     */
    public Map<String, Exception> getRegistrationExceptions() {
        return registrationExceptions;
    }

    /**
     * Sets the full registrations exception map. This will overwrite any previously saved mappings.
     * @param registrationExceptions the new full registrations exception map.
     */
    public void setRegistrationExceptionsMap(Map<String, Exception> registrationExceptions)
    {
        this.registrationExceptions = registrationExceptions;
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