Spring MVC Maven登录注册项目404错误排查：Tomcat版本及依赖库更新影响咨询与解决方案请求

Hey there, let's break down your Spring MVC login/register flow issue step by step—this is a common pitfall with version mismatches and configuration gaps.

Your Context #

I’m trying to understand and clone a Spring MVC login/register flow. I’ve fully followed the original code and process, only modifying database configuration, and can successfully insert data into MySQL 8.0.27 via test files. However:

• Initially, the form’s action threw an error: element loginProcess is not found, which I fixed by adjusting the form action.
• Now I’m still hitting a 404 error: The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

My questions:

1. Could using Apache Tomcat 10.0.13 cause this issue?
2. Did updating dependencies with a new Eclipse version trigger this problem?
3. What specific fixes can I apply?

Key Troubleshooting Steps & Fixes #

1. Tomcat Version Compatibility (Critical!) #

Yes, Tomcat 10.x is almost certainly a major factor here. Here’s why:

• Tomcat 10 switched from Java EE APIs (e.g., javax.servlet.*) to Jakarta EE APIs (e.g., jakarta.servlet.*).
• The original Spring MVC project you cloned is built for Java EE, so it won’t work natively with Tomcat 10—this is a breaking change that causes request mapping failures and 404s.

Fix Options:

• Downgrade to Tomcat 9.x: This is the fastest, lowest-effort fix. Tomcat 9 is fully compatible with Spring 5.x (the version used in most older MVC projects) and Java EE APIs.
• Migrate to Jakarta EE (Advanced): If you want to stick with Tomcat 10, you’ll need to upgrade the project to Spring Framework 6.x/Spring Boot 3.x, which support Jakarta EE. This requires replacing all javax.servlet imports with jakarta.servlet and updating all related dependencies.

2. Dependency Version Mismatches #

Updating dependencies in Eclipse can introduce silent conflicts, especially if the original project relies on specific Spring versions.

Check & Fix:

• Verify your pom.xml (Maven) or build.gradle (Gradle) matches the original project’s dependency versions. For example, the original project likely uses Spring 5.x, which doesn’t support Jakarta EE.
• Avoid mixing Spring Framework versions (e.g., don’t pair spring-core 5.3.x with spring-webmvc 6.x).
• Ensure the MySQL 8.0.27 driver is explicitly included with the correct version:

  <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.27</version>
  </dependency>
  

3. Request Mapping & Form Action Alignment #

Even after fixing the initial action error, double-check these details:

• The form’s action must exactly match the @RequestMapping value in your controller. For example, if your controller has:

  @RequestMapping(value = "/loginProcess", method = RequestMethod.POST)
  

  Your form should use the context path to avoid deployment context issues:

  <form action="${pageContext.request.contextPath}/loginProcess" method="post">
  

• Always prepend ${pageContext.request.contextPath} to the action—this ensures the request targets your app’s context, even if it’s deployed under a non-root path.

4. Dispatcher Servlet Configuration #

Ensure your web.xml (or Java-based config) correctly maps the Dispatcher Servlet to handle all requests:

• In web.xml, confirm this section is present and correct:

  <servlet-mapping>
      <servlet-name>dispatcher</servlet-name>
      <url-pattern>/</url-pattern>
  </servlet-mapping>
  

• If using Java config, verify your DispatcherServletRegistrationBean is set up with the "/" URL pattern.

5. Deployment Cleanup #

• In Eclipse, go to the Servers tab, right-click your Tomcat server, and select Clean to clear cached deployment files. Then restart the server.
• Check Tomcat’s webapps folder to ensure your application’s WAR file is unpacked correctly (no missing files or corrupted directories).

Quick Validation Test #

1. First, downgrade to Tomcat 9.x—this will rule out the biggest compatibility issue.
2. Redeploy the original GitHub code (only updating DB config) and test the login/register flow.
3. If it works, apply your custom changes incrementally to avoid breaking the flow.

内容的提问来源于stack exchange，提问作者Krishna Dubey