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Managing AWS CloudFront Using Spring Shell



This article explores an efficient approach to deploying static pages in CloudFront while leveraging the content delivery capabilities of AWS S3 and the convenience of Spring Shell Command-Line Interface (CLI) using the AWS SDK for Java. It highlights the benefits of integrating CloudFront with AWS S3, enabling businesses to optimize content delivery globally and reduce latency.

The article emphasizes the usage of the AWS SDK for Java along with Spring Shell CLI as a quicker alternative for CDN management, allowing developers to easily update CloudFront Origin Paths and invalidate CDN content.

By combining CloudFront, AWS S3, the AWS Java SDK, and Spring Shell CLI, businesses can enhance website performance and provide a seamless user experience.

Spring Shell: Exploring the Capabilities

Spring Shell is a versatile command-line framework specifically designed to simplify the development of interactive shell applications in Java. It provides developers with a comprehensive range of tools and features that make it easy to create command-line interfaces (CLIs).

With Spring Shell, developers can quickly define commands, options, and arguments to build interactive applications that can be executed directly from the command prompt. This enables users to interact with the application through a text-based interface.

The framework offers essential features such as auto-completion, history management, scripting support, and tabular output formatting, which greatly enhance the development experience. It seamlessly integrates with other Spring projects, including Spring Boot and Spring Data, allowing for smooth integration with existing Java applications.

A notable advantage of Spring Shell is its modular and extensible design. It provides a flexible plugin architecture that empowers developers to extend and customize the CLI with additional commands and features. This flexibility makes it well-suited for a wide range of applications, from simple administrative tools to complex interactive systems.

Spring Shell is a powerful tool that empowers Java developers to create robust and user-friendly command-line applications. Its extensive feature set, seamless integration capabilities, and extensibility make it a popular choice for building CLIs within the Java ecosystem.

Spring Shell Application vs. Web Application

Delivering a Spring Shell application instead of web-based applications can be a more suitable choice for certain business needs. Unlike web-based applications that require a browser interface, a Spring Shell application operates through a command-line interface, offering a streamlined and efficient user experience. This approach is particularly beneficial for businesses that prioritize automation, scripting, and quick execution of commands.

For example, in a scenario where an organization needs to perform routine tasks or batch operations on a large scale, a Spring Shell application provides a convenient and scriptable solution. It allows businesses to automate complex workflows, integrate with existing systems, and easily manage tasks through the command line, ultimately improving productivity and reducing reliance on manual web interactions.

AWS Security with Spring Shell

A Spring Shell application, similar to the security model employed by the AWS Command Line Interface (CLI), offers robust security measures at the user level. It ensures that only authorized users with appropriate credentials can access and interact with the application’s command-line interface. By implementing user authentication and access controls, businesses can maintain strict security standards and protect sensitive information.

With a Spring Shell application, administrators can manage user accounts, assign specific roles and permissions, and enforce secure authentication mechanisms such as username/password or API keys. This user-centric security approach adds an extra layer of protection, mitigating the risk of unauthorized access and safeguarding the application and its associated resources.

User-Level Security on Web-based Applications

On the contrary, implementing user-level AWS security in a web-based application can be a more complex and involved process. Web-based applications often require a comprehensive authentication and authorization system that includes handling user sessions, managing access tokens, and implementing secure communication protocols. Additionally, developers must carefully design and implement user management features, including user registration, password management, and role-based access control.

These tasks can be time-consuming and require expertise in web application security practices. In contrast, a Spring Shell application simplifies the security model by providing a command-line interface secured at the user level, which can be a more suitable and efficient solution for businesses with specific security requirements.

User Activity Audit

In a web-based application, implementing a user-level audit trail can be a non-trivial task that requires additional development effort. Developers need to design and implement custom logging and tracking mechanisms to capture and record user actions, user identities, and relevant metadata. This includes handling database operations, tracking user interactions, and managing log files.

On the other hand, when using Spring Shell with the AWS SDK, the user-level audit trail is automatically handled by AWS via the SDK, providing a seamless and built-in mechanism for tracking user actions and interactions with AWS services. This eliminates the need for manual implementation and simplifies the process of generating comprehensive audit trails.

AWS CloudFront

Amazon CloudFront is a leading content delivery network (CDN) service that enables efficient and reliable distribution of web content globally. As a CDN, CloudFront utilizes edge locations strategically placed around the world to minimize latency and deliver content with exceptional performance.

With CloudFront, you can effectively manage your CDN by leveraging its powerful features and tools. The service allows you to optimize the distribution of both static and dynamic web content, ensuring fast and reliable delivery to end-users. By utilizing caching mechanisms and edge locations, CloudFront reduces the load on origin servers and improves response times.

CloudFront provides a range of options and commands for managing your CDN effectively. You can easily clear screens and manage the content distribution settings, including configuring caching behavior and adjusting performance parameters. The service offers logging capabilities, allowing you to monitor and analyze the performance of your CDN and make data-driven decisions.

Additionally, CloudFront integrates seamlessly with other AWS services, such as Amazon S3, Spring Framework, and Maven, enabling streamlined development and deployment processes. The service supports the latest JDK 17, ensuring compatibility with modern Java applications.

When it comes to CDN management, CloudFront offers debugging and logging functionalities to help diagnose and resolve issues. You can leverage these features to optimize your content delivery strategy and ensure a seamless user experience.

Amazon CloudFront is a powerful CDN service that simplifies and enhances CDN management. By utilizing its advanced features, including caching, edge locations, and logging capabilities, you can effectively deliver web content with low latency and high performance. Whether you’re distributing static or dynamic content, CloudFront provides the tools and flexibility needed to manage your CDN efficiently.

Example Use Case

In this example use case, let’s explore deploying a static page in Amazon CloudFront while utilizing content provided by AWS S3. We will leverage the CloudFront Origin Path and CDN content invalidation to ensure a seamless deployment process.

Common Operations for maintaining a CDN Includes (but not limited to):

Using the Spring Shell CLI, we can easily update the CloudFront Origin Path to point to the AWS S3 bucket containing our static page content. By executing the “update Origin Path” command, we can modify the path from “/live-current” to “/live-next,” ensuring that CloudFront retrieves the latest version of the static page from the designated AWS S3 bucket utilizing an S3 Bucket Policy that permits public access to prefixes with pattern “/live*”.

S3 Bucket Policy

    "Version": "2012-10-17",
    "Id": "Public Policy",
    "Statement": [
            "Sid": "Stmt1397633323327",
            "Effect": "Allow",
            "Principal": {
                "AWS": "*"
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::cdn-bucket/live*"

After updating the CloudFront Origin Path, we need to invalidate the existing CDN content. This step is crucial to remove any cached versions of the previous static page and guarantee the delivery of the updated content. Through the Spring Shell CLI, we issue the “invalidate CDN content” command, triggering CloudFront to fetch the latest version from the updated Origin Path in the AWS S3 bucket.

AWS S3 serves as the content provider for CloudFront, enabling efficient storage and retrieval of static page content. By seamlessly integrating CloudFront with AWS S3, we ensure optimal performance and global availability of the static page.

By combining the power of CloudFront, AWS S3, and the Spring Shell CLI, we can efficiently deploy static pages and ensure a smooth user experience. The CloudFront Origin Path update allows us to seamlessly transition to the new version of the static page, while the CDN content invalidation ensures that users receive the most up-to-date content from the AWS S3 bucket.

By leveraging the Spring Shell CLI, CloudFront, and AWS S3, we can effectively deploy static pages by updating the CloudFront Origin Path and performing CDN content invalidation. This integration between CloudFront and AWS S3 provides a reliable and scalable solution for delivering static page content globally.

Spring Shell Class: CDNCommands



The object mapper is configured in ShellConfig.java for rendering response objects to JSON.

ObjectMapper objectMapper() {
    return new ObjectMapper()


The DefaultSettings is a component that resolves the value of a user set environment variable AWS_CLOUDFRONT_DIST_ID. This value is essentially used for all commands and makes the Distribution ID an optional argument if the environment variable is set.

public class DefaultSettings {

    String distributionID;

    * The env AWS_CLOUDFRONT_DIST_ID is a user-defined environment variable for setting the default Distribution ID.
    public DefaultSettings(@Value("#{environment.AWS_CLOUDFRONT_DIST_ID}") String distributionID) {
        this.distributionID = distributionID;


Setting Environment Variables In Linux/Unix


Setting Environment Variables In Windows

Variable Value

resolveDistID(String distID)

  * @param distID The CloudFront Distribution-ID
  * @return String Resolves to the DefaultSettings Distribution-ID if {@code distID} is empty.
 private String resolveDistID(String distID) {
     var resolvedDistID = hasLength(distID) ? distID : defaultSettings.getDistributionID();
     log.info("DistID: {}", resolvedDistID);
     return resolvedDistID;

getConfig(String distID)

        value = "Get CloudFront Distribution Config", 
        key = "config")
public String getConfig(
        @ShellOption(value = "dist", help = DIST_HELP, defaultValue = "") String optionalDistID) {

    var distID = resolveDistID(optionalDistID);
    if (!hasLength(distID)) {
        return "DistID was not resolved.";

    DistributionConfig result;
    try {
        result = getDistributionConfig(distID).getDistributionConfig();
    } catch (AccessDeniedException | NoSuchDistributionException e) {
        return format(INVALID_DIST_ID_MSG,
                distID, e.getErrorMessage(), e.getErrorCode(), e.getStatusCode());

    return objectMapper.writeValueAsString(result);

updatePath(String optionalDistID, String newPath)

        value = "Update the CloudFront distribution origin path", 
        key = "update-path")
public String updatePath(
        @ShellOption(value = "dist", help = DIST_HELP, defaultValue = "") String optionalDistID,
        @ShellOption(value = "path", help = PATH_HELP) String newPath) {

    var distID = resolveDistID(optionalDistID);
    GetDistributionConfigResult distConfigResult = getDistributionConfig(distID);

    DistributionConfig distConfig = distConfigResult.getDistributionConfig();
    Optional<Origin> origin = distConfig.getOrigins().getItems().stream().findFirst();
    if (origin.isEmpty()) {

    UpdateDistributionRequest request = new UpdateDistributionRequest()

    return "Success";

invalidatePath(String optionalDistID, String path)

        value = "Invalidate a CloudFront distribution path", 
        key = "invalidate-path")
public String invalidatePath(
        @ShellOption(value = "dist", help=DIST_HELP, defaultValue = "") String optionalDistID,
        @ShellOption(value = "path", help = PATH_HELP) String path) {

    var distID = resolveDistID(optionalDistID);

    GetDistributionConfigResult distConfigResult = getDistributionConfig(distID);

    DistributionConfig distConfig = distConfigResult.getDistributionConfig();
    Optional<Origin> origin = distConfig.getOrigins().getItems().stream().findFirst();
    if (origin.isEmpty()) {

    InvalidationBatch batch = new InvalidationBatch()
            .withPaths(new Paths().withItems(path)
    CreateInvalidationRequest request = new CreateInvalidationRequest()

    return "Success";

Overview of Spring Shell Commands

Main Help

cdn:> help


Built-In Commands
       help: Display help about available commands
       stacktrace: Display the full stacktrace of the last error.
       clear: Clear the shell screen.
       quit, exit: Exit the shell.
       history: Display or save the history of previously run commands
       version: Show version info
       script: Read and execute commands from a file.

CDN Commands
       invalidate-path: Invalidate a CloudFront distribution path
       update-path: Update the CloudFront distribution origin path
       config: Get CloudFront Distribution Config

Get Config

Retrieves the CloudFront configuration from the given distribution ID.


cdn:> config -h

       config - Get CloudFront Distribution Config

       config --dist String --help 

       --dist String
       The CloudFront distribution ID, i.e. 'E1OAOW8NPJ78SQ' (Optional). Defaults to env var AWS_CLOUDFRONT_DIST_ID.

Error Messaging

This example error message displays when an unknown Distribution ID is supplied.

cdn:> config --dist 123

2023-05-25T15:06:04.733-07:00 DistID: 123
CDN with distID[123] failed with: The specified distribution does not exist.
  code=[NoSuchDistribution] status=[404]

Execute Command

cdn:> config --dist A1OBOX9NPJ37SQ

JSON Output

The output has been trimmed to remove certain values for brevity. The key element to focus on is the “origin” component, which holds significant importance.

  "callerReference" : "142a4b34-863b-4d8f-9282-f28cd66f2d2a",
  "aliases" : {
    "quantity" : 1,
    "items" : [ "cdn.mysite.com" ]
  "defaultRootObject" : "index.html",
  "origins" : {
    "quantity" : 1,
    "items" : [ {
      "id" : "cdn.s3.us-west-1.amazonaws.com",
      "domainName" : "cdn.s3.us-west-1.amazonaws.com",
      "originPath" : "/live-2023-May-17-01",
      "customHeaders" : {},
      "s3OriginConfig" : {},
      "customOriginConfig" : null,
      "connectionAttempts" : 3,
      "connectionTimeout" : 10,
      "originShield" : {
        "enabled" : true,
        "originShieldRegion" : "us-west-1"
      "originAccessControlId" : ""
    } ]
  "originGroups" : {},
  "defaultCacheBehavior" : {},
  "cacheBehaviors" : {},
  "customErrorResponses" : {},
  "comment" : "",
  "logging" : {},
  "priceClass" : "PriceClass_All",
  "enabled" : true,
  "viewerCertificate" : {
  "restrictions" : {},
  "webACLId" : "",
  "httpVersion" : "http2and3",
  "isIPV6Enabled" : true,
  "continuousDeploymentPolicyId" : "",
  "staging" : false,
  "ipv6Enabled" : true

Update Path

This command is designed to help you switch to a new release path. But before running the command, you’ll need to follow a step to deploy the updated site to a new S3 bucket prefix.


cdn:> update-path -h

       update-path - Update the CloudFront distribution origin path

       update-path --dist String [--path String] --help 

       --dist String
       The CloudFront distribution ID, i.e. 'E1OAOW8NPJ78SQ' (Optional). Defaults to env var AWS_CLOUDFRONT_DIST_ID.

       --path String
       The CloudFront origin path, i.e. '/live-2023-05-25'

Execute Command

The purpose of the following example scenario is to demonstrate the process of releasing a new version of CDN content after uploading it to a new S3 bucket prefix, with the added ability to roll back to the previously released content if needed.

To achieve a seamless transition to the newly uploaded content, the Shell Command “update-path” can be used to switch the path accordingly.

Existing Release:

New Release Upload to new S3 Prefix

To release the new site and instruct CloudFront to direct to the new path (i.e., S3 bucket prefix), execute the following Spring Shell command.

cdn:> update-path --dist A1OBOX9NPJ37SQ --path /live-2023-05-25
# Output
2023-05-25T14:28:21.169-07:00 DistID: A1OBOX9NPJ37SQ

AWS CloudFront Console

The user can verify the update by navigating to the AWS CloudFront console and checking that the origin path on the target distribution has been successfully updated to /live-2023-05-25.


Invalidate Path

The user can also invalidate the CloudFront distribution origin path to ensure that any cached content is refreshed and the latest version of the site is served. This can be done through the appropriate API or management console provided by AWS CloudFront. Invalidating the origin path allows for efficient content updates and ensures that users receive the most up-to-date version of the website when accessing it through the CloudFront CDN.


cdn:> invalidate-path -h

       invalidate-path - Invalidate the CloudFront distribution origin path

       invalidate-path --dist String [--path String] --help 

       --dist String
       The CloudFront distribution ID, i.e. 'E1OAOW8NPJ78SQ' (Optional). Defaults to env var AWS_CLOUDFRONT_DIST_ID.

       --path String
       The CloudFront origin path, i.e. '/live-2023-05-25'

Execute Command

cdn:> invalidate-path --path /*

AWS CloudFront Console

After invalidating a path, the user can actively verify and check the status of the invalidation using the AWS Console for CloudFront. This can be done by navigating to the appropriate section in the console where the user can view the details and progress of the invalidation request. The console provides clear figures and information that allow the user to track the status of the invalidation and ensure that the content is properly refreshed in the CloudFront CDN.


Clicking on the Invalidation ID link in AWS Console will render this Details View. The invalidation path supplied in the CLI is marked as (1) in the image below.



There are a few variations that could improve the devops task.

1. Allow Multiple Paths

This command could be modified to allow multiple paths as needed.

cdn:> invalidate --path '/image/*' --path '/docs/customer-support'
2. Invalidation Status

A new command invalidation-status could be created to show the progress of all path invalidations.

cdn:> invalidation-status

In Conclusion

Deploying a static page in CloudFront with the ability to update the CloudFront Origin Path via Spring Shell CLI and invalidate existing CDN content can greatly enhance the performance, scalability, and user experience of a web application. By leveraging the power of AWS S3 as a content provider and integrating CDN management capabilities offered by CloudFront, businesses can efficiently deliver static content to users worldwide, reducing latency and improving overall website performance.

Utilizing Spring Shell as a command-line interface provides a quicker alternative to web-based solutions for managing CDN configurations. With Spring Shell’s flexibility and ease of use, developers can efficiently update CloudFront Origin Paths, invalidate CDN content, and perform other management tasks directly from the command line, saving time and effort.

The combination of CloudFront, AWS S3, and Spring Shell CLI offers a powerful and efficient solution for deploying static pages, managing CDN configurations, and delivering content globally. By embracing these tools, businesses can streamline their content delivery processes, leverage the benefits of cloud infrastructure, and provide a seamless user experience to their audience.

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Understanding and Utilizing Bean Scopes in the Spring Framework In this article, we will delve into the concept of bean scopes in Spring Framework. Understanding and effectively utilizing bean scopes is essential for controlling the lifecycle and behavior of your beans, allowing you to enhance the flexibility and power of your Spring applications.
Spring 6 Error Handling Best Practices
Error handling and exception design are integral components of developing Spring RESTful APIs, ensuring the application’s reliability, stability, and user experience. These practices enable developers to effectively address unexpected scenarios, such as invalid requests, database errors, or service failures, by providing graceful error responses.
Spring Boot, Jackson, and Lombok Best Practices
This article discusses the recommended practices for using Jackson and Lombok in conjunction with Spring Boot, a popular framework for building enterprise-level Java applications.
Encrypting Properties File Values with Jasypt
Property files are text resources in your standard web application that contains key-value information. There may come a time when information should not be stored in plain sight. This article will demonstrate how to encrypt properties file values using Jasypt encryption module. Jasypt is freely available and comes with Spring Framework integration.
Spring Boot • Serialize Immutable Objects
This article illustrates how to serialize and write tests for immutable objects using Jackson and Lombok in Spring Boot.
Spring Boot Profiles & AWS Lambda: Deployment Guide
In this article, we will explore how to leverage the Spring Boot Profiles feature in an AWS Lambda Compute environment to configure and activate specific settings for each environment, such as development, testing, integration, and production.
AWS Lambda with Spring Boot: A Comprehensive Guide
This article explores the benefits of using Spring Boot with AWS Lambda, a powerful serverless compute service that enables developers to run code without worrying about server management. By integrating with the AWS cloud, AWS Lambda can respond to a variety of AWS events, such as S3, Messaging Gateways, API Gateway, and other generic AWS Resource events, providing an efficient and scalable solution for your application needs.
Secure SMTP with Spring JavaMailSender
This article discusses the use of Java Mail in the context of migrating email services to Google Apps For Your Domain. The author shares their experience with using the free service and encountered a problem with using the secure SMTP protocol to send emails programmatically through their old email account with the Spring JavaMailSender.