404 Errors in Spring Boot: Causes, Impacts and Processing Strategies
During web development, the 404 error is a common HTTP status code that indicates that the resource is not found.
In Spring Boot projects, developers may still encounter 404 errors, despite its reputation for its simplified configuration and rapid development speed.
This article will discuss in detail the causes of 404 errors in Spring Boot, their impact on projects, and how to effectively deal with and avoid such errors.
404 The reason for the error
1. URL path error
- The most common cause of 404 errors is that the requested URL path does not match the mapping path in the Spring Boot application.
- This may be due to a URL input error, a missing parent path, or an inappropriate context path setting.
- Spring Boot usage annotations (such as
@Controller、@RequestMapping、@GetMappingetc.) to define the mapping relationship between URL paths and processing methods, so it is crucial to ensure that these annotations are used correctly.
2. Controller configuration issues
- If the controller class is incorrectly located, or the controller method does not handle the request correctly, it may also result in a 404 error.
- For example, the controller class is not under the sibling or child package of the Spring Boot main class, or the controller method lacks the correct request method annotation (e.g.
@GetMapping、@PostMappingwait).
3. Static resource configuration error
- If static resources (such as HTML, CSS, JavaScript files) are used in the application
- However, these resources are not correctly placed in the project's static resource directory, or cannot be accessed through the correct URL path, which will also throw a 404 error
4. Missing dependencies or incompatible versions
- An application's dependency configuration error or version incompatibility may also result in a 404 error.
- Especially the core dependencies related to Spring Boot (e.g.
spring-boot-starter-web) Must be configured correctly and version compatible.
5. Configuration error
- Spring Boot configuration files (e.g.
or) configuration errors may also cause resources to be unavailable. - This includes error settings for configuration items such as URL path, port number, context path, etc.
6. Server configuration issues
- A 404 error can also result in a 404 error when a Spring Boot application is deployed on an external server such as Nginx, Apache, or Tomcat.
- For example, Nginx forwarding configuration errors, Tomcat deployment configuration errors, etc.
404 The impact of error
- The 404 error will not only cause inconvenience to users and affect user experience, but may also reduce users' trust in the website.
- In addition, frequent 404 errors will also affect the search engine optimization (SEO) of the website and reduce the website's ranking in search engines.
- Therefore, timely and effectively dealing with and avoiding 404 errors is crucial to maintaining the healthy operation of the website.
How to handle and avoid 404 errors
1. Check the URL path
- Make sure the requested URL path exactly matches the mapped path in the application.
- Check the URL for typos, missing parts, or improper context path settings.
2. Review the controller configuration
- Make sure the controller class is in the correct package path and that the controller method uses the correct request method annotation.
- At the same time, check whether the return type and logic of the method are correct.
3. Configure static resources
- Place static resources in the static resource directory of the project
- And make sure these resources can be accessed through the correct URL path
4. Check dependencies and configuration
- Ensure that the application's dependencies are correctly configured and version compatible.
- At the same time, check whether the settings in the configuration file are correct.
5. View logs and debug information
- View the application's log file for more details about the error.
- This helps quickly locate the root cause of the problem and take corresponding solutions.
6. Regular maintenance and inspection
- Check and update links on the website regularly to ensure their effectiveness.
- Use tools to check the link status to promptly discover and repair invalid links.
7. Use Custom 404 Pages
- Set up a custom 404 page to provide users with friendly prompt information, and provide relevant links to help users find what they need.
- This not only improves the user experience, but also enhances the search engine's website friendliness.
in conclusion
404 errors are one of the inevitable problems in web development, but in Spring Boot projects, we can effectively handle and avoid such errors by carefully checking URL paths, controller configurations, static resources, dependencies and configurations, viewing logs and debugging information, regular maintenance and inspections, and using custom 404 pages.
This not only helps improve user experience and website accessibility, but also helps improve the search engine ranking and overall operational effectiveness of the website.
The above is personal experience. I hope you can give you a reference and I hope you can support me more.