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Discover a simple guide to integrate `Tomcat Rewrite Valve` in a `Spring Boot 2.0` application packaged as a fat jar without the need for a WAR structure.
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How to Add Tomcat Rewrite Valve to Your Spring Boot 2.0 Application

If you’re a developer working with Spring Boot 2.0 and Tomcat, you may find yourself needing to implement URL rewriting for your application. This can be tricky, especially when you’re packaging your application as a fat jar. In this guide, we'll walk through how to successfully add the Tomcat Rewrite Valve to your Spring Boot application without restructuring it into a WAR file.

Understanding the Rewrite Valve

The Tomcat Rewrite Valve allows URL rewriting at the server level. This is particularly useful when you want to manage routing or redirect requests without changing your application's URL structure directly. For instance, if you're using React on your server side, you might want to redirect all routes to a single index.html file.

The Challenge

In a typical setup, Tomcat expects a specific directory structure, including a WEB-INF folder, to load the rewrite.conf. With a fat jar approach, this structure is often missing, which leads to issues when trying to utilize the rewrite capabilities.

Step-by-Step Solution

Here’s how to effectively add the Tomcat Rewrite Valve to your Spring Boot application:

Step 1: Create the Rewrite Configuration File

First, inside your resources directory, create a file named rewrite.config.

Add the necessary URL rewriting rules in this file. For example, the following rules redirect all non-static requests to index.html:

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Step 2: Customize Your Tomcat Configuration

You need to create a custom class that will configure Tomcat and load the rewrite rules from your rewrite.config. Follow these steps:

Create a class named CustomContainer and annotate it with @ Component.

Implement the WebServerFactoryCustomizer<TomcatServletWebServerFactory> interface.

Override the customize method to add the rewrite valve.

Here’s a sample implementation:

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Step 3: Test Your Configuration

After implementing the custom class, restart your application. Ensure that your routing works as intended, and that requests to routes managed by React are redirected to index.html without throwing errors.

Conclusion

Integrating the Tomcat Rewrite Valve into a Spring Boot 2.0 application packaged as a fat jar is achievable without restructuring into a WAR format. By following the steps outlined above, you should be able to configure URL rewriting effortlessly.

This method not only maintains your application's architecture but also enhances your routing capabilities. If you run into any issues, double-check your rewrite.config file and the custom configuration class for potential pitfalls.

Now you're ready to implement effective URL rewriting in your Spring Boot application. Happy coding!