Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesBlade is a lightweight Java MVC web framework built on Java 8 and Netty 4. It offers two ways to define routes—fluent handlers and annotated controllers—and supports common web-app needs such as JSON responses, templates, sessions, middleware and file transfers. You can start a minimal app from a Java main method and package it as a standalone JAR.
What is Blade?
Blade is an open-source Java framework for building web applications and APIs. Its project maintainers describe it as a simple, flexible framework with a small design intended to be understandable without a large learning curve. It uses an MVC programming model and Netty 4 as its networking foundation. The project repository is lets-blade/blade on GitHub.
Blade’s compact approach is an architectural preference, not proof that it will outperform another framework in a particular application. The project README includes the claim “100 concurrent qps 20w/s,” but does not provide a test date, hardware, workload, test harness or independent reproduction. Treat that figure as a project claim, not a comparable benchmark.
What can you build with Blade?
The framework’s features cover the core request-and-response path as well as common application plumbing:
- Routing: GET, POST, PUT and DELETE routes, defined with a fluent API or annotations such as
@Path,@GETand@POST. - Requests and responses: Access URL, form, path and body parameters, headers and cookies; return text, HTML, JSON or streams; and parse models.
- Web application features: Serve static files, upload and download files, redirect requests, render templates and manage sessions.
- Operations and extension points: Configure ports and SSL, add logging, web hooks and custom middleware, handle exceptions, and use scheduled tasks.
- Security mechanisms: The project lists CSRF and XSS defense, Basic Auth and authorization. These are framework mechanisms, not a guarantee that an application is secure; configuration, dependency versions and application code still matter.
The Blade documentation has guides for installation, routing, static files, views, request and response APIs, configuration, deployment, exceptions, sessions and middleware.
How to create a minimal Blade app
The official README quick start uses Blade Core version 2.1.2.RELEASE. The project repository page currently displays v2.1.3, so check the repository for the version you intend to use rather than assuming the quick-start coordinate is the latest.
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1. Add the dependency
For Maven, add this to your project’s pom.xml:
<dependency>
<groupId>com.hellokaton</groupId>
<artifactId>blade-core</artifactId>
<version>2.1.2.RELEASE</version>
</dependency>For Gradle, the equivalent coordinate shown in the README is:
implementation 'com.hellokaton:blade-core:2.1.2.RELEASE'2. Define a route and start the server
Put this in a Java class with a main method:
public static void main(String[] args) {
Blade.create().get("/", ctx -> ctx.text("Hello Blade")).start();
}This registers a GET handler for /, returns plain text and starts the server. The README’s example listens on port 9000; after startup, open http://localhost:9000 to see the response.
3. Choose a route style as the app grows
For a small endpoint, the fluent form keeps the route close to its handler. For controller-oriented organization, Blade also supports annotated classes using annotations such as @Path and @GET. These are alternative ways to express routing; choose based on how you want to group and maintain your application’s handlers.
Can Blade run as a standalone JAR?
Yes. Blade documents packaging an application as a JAR and running it as a standalone service, so a servlet container is not required for the documented deployment model. This can suit small services, internal tools and APIs when direct routing and a compact application structure are priorities. That suitability is an architectural judgment, not a performance finding.
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You can configure the server port in code, in application.properties, or with a command-line argument such as --server.port=9001. The README example has sessions disabled by default; enable them through configuration or the API if the application needs them. Consult the documentation’s package-deployment and configuration guides for the exact setup appropriate to your app.
Is Blade still maintained?
The available project signals show recent activity: the maintainer organization page lists the Java repository as updated May 15, 2026, and the repository page displays v2.1.3. The repository also shows approximately 5.9k stars and 1.2k forks and identifies an Apache-2.0 license. Those are useful signs of visibility and project activity, but stars and forks do not establish how widely the framework is used or how reliable it will be for a particular workload. Check the repository’s release history and issue activity when evaluating it for a new project.
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How does Blade compare with Spring Boot?
The official Blade pages cited here do not provide a current, sourced head-to-head comparison with Spring Boot. The practical distinction to evaluate is fit: Blade presents itself as a small MVC framework with direct route definitions, annotation-based controllers and standalone JAR deployment. A decision between it and Spring Boot should account for the application’s required integrations, team familiarity, documentation, ecosystem, deployment needs and maintenance expectations—not an unsupported claim that one is universally faster or simpler.
Quick Recap
- Consider Blade if its documented routing and built-in features fit your application and you value a compact framework structure.
- Compare alternatives carefully if your project depends on a specific integration, a larger ecosystem, extensive organizational experience or support requirements that need separate verification.
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