Javalin vs Spark Framework: What are the differences?
Introduction
Javalin and Spark Framework are both lightweight web frameworks that are used for building web applications in Java. While they serve a similar purpose, there are some key differences between the two.
1. Request Handling:
Javalin handles requests in a non-blocking manner by using Kotlin coroutines or Java CompletableFutures, allowing for improved scalability and performance. On the other hand, Spark Framework handles requests in a blocking manner, which may result in slower performance when dealing with high concurrent traffic.
2. Middleware Functionality:
Javalin provides a middleware concept known as "handlers" which allows for easy modification and manipulation of HTTP requests and responses at various points in the request pipeline. In contrast, Spark Framework does not provide built-in middleware functionality, requiring developers to write custom code for similar functionality.
3. Routing:
Javalin provides a powerful routing API that allows developers to define routes using a fluent syntax, making it easier to handle different HTTP methods and route parameters. In comparison, Spark Framework uses a simpler route mapping syntax, which may be easier for beginners but lacks some of the advanced routing features provided by Javalin.
4. Templating Support:
Javalin does not provide built-in support for templating engines, requiring developers to use third-party libraries for server-side rendering. On the other hand, Spark Framework includes built-in support for popular templating engines like Thymeleaf and Mustache, making it easier to generate dynamic HTML views.
5. WebSocket Support:
Javalin includes support for WebSocket communication out of the box, making it easier to build real-time applications that require bidirectional communication between server and client. In contrast, Spark Framework does not provide native support for WebSocket communication, requiring developers to use additional libraries or implement custom solutions.
6. Database Integration:
Javalin allows developers to integrate with various databases using the Java Persistence API (JPA) or SQL-based libraries like JOOQ and jDBI. Spark Framework, on the other hand, does not provide built-in database integration and requires developers to use external libraries for working with databases.
In summary, Javalin offers non-blocking request handling, built-in middleware functionality, powerful routing API, flexible templating options, WebSocket support, and database integration. While Spark Framework provides a simpler routing syntax and built-in support for templating engines, it lacks some of the advanced features and flexibility provided by Javalin.
