Скачать или смотреть Solving Spring Boot 2.x with Camel 2.25 Endpoint Issues: Making @ RestController Work

Discover how to resolve 404 errors in your Spring Boot 2.x applications with Camel 2.25 by configuring separate context paths for REST controllers.
---
This video is based on the question https://stackoverflow.com/q/63090630/ asked by the user 'Abhishek Chatterjee' ( https://stackoverflow.com/u/1573161/ ) and on the answer https://stackoverflow.com/a/63108663/ provided by the user 'Bhushan Uniyal' ( https://stackoverflow.com/u/4884334/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Spring boot 2.x with Camel 2.25 : Spring specific endpoints not working

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding the Endpoint Issue in Spring Boot with Camel

Developers often encounter issues when integrating various technologies in a single application. A common problem arises when using Spring Boot 2.x with Apache Camel 2.25, particularly when attempting to use the @ RestController along with Camel routes. If you’ve added Spring's @ RestController classes to your project only to discover they’re throwing 404 errors, you’re not alone. In this guide, we will break down the problem and provide a clear solution to ensure your Spring Boot application functions seamlessly with Camel.

The Problem: 404 Errors for @ RestController Endpoints

When integrating Spring Boot with Apache Camel, you may find that requests to your Spring-based REST controller endpoints return 404 errors. The issue stems from the fact that all requests are being intercepted by the CamelServlet, which does not recognize the Spring @ RestController endpoints. It only acknowledges the Camel REST consumer route endpoints, leading to those frustrating not-found errors.

Example Configuration

Here’s a snippet of the configuration that led to the issue:

[[See Video to Reveal this Text or Code Snippet]]

Key Dependencies in Your POM

Your POM file might include essential dependencies such as:

[[See Video to Reveal this Text or Code Snippet]]

Why Is This Happening?

The issue arises because the pattern context-path: /* is too broad. This configuration allows Camel to intercept all incoming requests before they can reach the Spring framework's servlet dispatcher, which is responsible for handling @ RestController calls.

The Solution: Defining Separate Context Paths

To resolve this conflict, you need to establish a distinct context path for Camel routes. By doing so, you ensure that requests intended for your Spring REST endpoints can bypass Camel, allowing them to function correctly.

Configure a New Context Path for Camel

You can adjust your application configuration as follows:

[[See Video to Reveal this Text or Code Snippet]]

This alteration effectively registers /camel-api as the base route for Camel. Any request that does not match this pattern will then be handled by Spring.

Example Servlet Registration

To register the Camel servlet with the new context path programmatically, you can use the following code:

[[See Video to Reveal this Text or Code Snippet]]

Alternative Configuration Using Application Properties

If you prefer a properties-based approach, simply configure your application.yml or application.properties to reflect the new context path for Camel, as shown above. This allows for easy adjustments without altering your Java code.

Conclusion

By setting a separate context path for your Camel routes, you can resolve the 404 errors you're experiencing with your Spring Boot application. This configuration allows your @ RestController endpoints to process requests as intended, while still leveraging the power of Apache Camel for your integration needs. Embracing this solution will streamline your development process and enhance your application's capabilities.

Now, you can proceed confidently with your Spring Boot and Camel integration, ensuring every part of your application functions harmoniously. Happy coding!