aws-connect-user/src/main/java/software/amazon/connect/user/BaseHandlerStd.java [44:95]:
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    @Override
    public ProgressEvent<ResourceModel, CallbackContext> handleRequest(
            final AmazonWebServicesClientProxy proxy,
            final ResourceHandlerRequest<ResourceModel> request,
            final CallbackContext callbackContext,
            final Logger logger) {
        return handleRequest(
                proxy,
                request,
                callbackContext != null ? callbackContext : new CallbackContext(),
                proxy.newProxy(ClientBuilder::getClient),
                logger);
    }

    protected abstract ProgressEvent<ResourceModel, CallbackContext> handleRequest(
            final AmazonWebServicesClientProxy proxy,
            final ResourceHandlerRequest<ResourceModel> request,
            final CallbackContext callbackContext,
            final ProxyClient<ConnectClient> proxyClient,
            final Logger logger);

    protected static void handleCommonExceptions(final Exception ex, final Logger logger) {
        if (ex instanceof ResourceNotFoundException) {
            throw new CfnNotFoundException(ex);
        } else if (ex instanceof InvalidParameterException || ex instanceof InvalidRequestException) {
            throw new CfnInvalidRequestException(ex);
        } else if (ex instanceof InternalServiceException) {
            throw new CfnServiceInternalErrorException(ex);
        } else if (ex instanceof DuplicateResourceException) {
            throw new CfnAlreadyExistsException(ex);
        } else if (ex instanceof LimitExceededException) {
            throw new CfnServiceLimitExceededException(ex);
        } else if (ex instanceof ConnectException && StringUtils.equals(THROTTLING_ERROR_CODE, ((ConnectException) ex).awsErrorDetails().errorCode())) {
            throw new CfnThrottlingException(ex);
        } else if (ex instanceof ConnectException && StringUtils.equals(ACCESS_DENIED_ERROR_CODE, ((ConnectException) ex).awsErrorDetails().errorCode())) {
            throw new CfnAccessDeniedException(ex);
        }
        logger.log(String.format("Exception in handler:%s", ex));
        throw new CfnGeneralServiceException(ex);
    }

    protected static <RequestT extends AwsRequest, ResponseT extends AwsResponse> ResponseT invoke(final RequestT request,
                                                                                                   final ProxyClient<ConnectClient> proxyClient,
                                                                                                   final Function<RequestT, ResponseT> requestFunction,
                                                                                                   final Logger logger) {
        ResponseT response = null;
        try {
            response = proxyClient.injectCredentialsAndInvokeV2(request, requestFunction);
        } catch (Exception e) {
            handleCommonExceptions(e, logger);
        }
        return response;
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aws-connect-userhierarchygroup/src/main/java/software/amazon/connect/userhierarchygroup/BaseHandlerStd.java [37:88]:
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    @Override
    public ProgressEvent<ResourceModel, CallbackContext> handleRequest(
            final AmazonWebServicesClientProxy proxy,
            final ResourceHandlerRequest<ResourceModel> request,
            final CallbackContext callbackContext,
            final Logger logger) {
        return handleRequest(
                proxy,
                request,
                callbackContext != null ? callbackContext : new CallbackContext(),
                proxy.newProxy(ClientBuilder::getClient),
                logger);
    }

    protected abstract ProgressEvent<ResourceModel, CallbackContext> handleRequest(
            final AmazonWebServicesClientProxy proxy,
            final ResourceHandlerRequest<ResourceModel> request,
            final CallbackContext callbackContext,
            final ProxyClient<ConnectClient> proxyClient,
            final Logger logger);

    protected static void handleCommonExceptions(final Exception ex, final Logger logger) {
        if (ex instanceof ResourceNotFoundException) {
            throw new CfnNotFoundException(ex);
        } else if (ex instanceof InvalidParameterException || ex instanceof InvalidRequestException) {
            throw new CfnInvalidRequestException(ex);
        } else if (ex instanceof InternalServiceException) {
            throw new CfnServiceInternalErrorException(ex);
        } else if (ex instanceof DuplicateResourceException) {
            throw new CfnAlreadyExistsException(ex);
        } else if (ex instanceof LimitExceededException) {
            throw new CfnServiceLimitExceededException(ex);
        } else if (ex instanceof ConnectException && StringUtils.equals(THROTTLING_ERROR_CODE, ((ConnectException) ex).awsErrorDetails().errorCode())) {
            throw new CfnThrottlingException(ex);
        } else if (ex instanceof ConnectException && StringUtils.equals(ACCESS_DENIED_ERROR_CODE, ((ConnectException) ex).awsErrorDetails().errorCode())) {
            throw new CfnAccessDeniedException(ex);
        }
        logger.log(String.format("Exception in handler:%s", ex));
        throw new CfnGeneralServiceException(ex);
    }

    protected static <RequestT extends AwsRequest, ResponseT extends AwsResponse> ResponseT invoke(final RequestT request,
                                                                                                   final ProxyClient<ConnectClient> proxyClient,
                                                                                                   final Function<RequestT, ResponseT> requestFunction,
                                                                                                   final Logger logger) {
        ResponseT response = null;
        try {
            response = proxyClient.injectCredentialsAndInvokeV2(request, requestFunction);
        } catch (Exception e) {
            handleCommonExceptions(e, logger);
        }
        return response;
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