Spring Boot应用所有REST端点失效，Actuator访问异常求助

Hey there! Let's try to figure out what's going on with your Spring Boot app. First off, it would be super helpful if you could share the actual code snippets for your main application class, REST controller, your build.gradle dependencies, and the contents of application.properties—those details are crucial for pinpointing the exact issue.

That said, based on common pitfalls when facing this kind of problem, here are some key things to check:

1. Actuator Endpoints Not Properly Enabled/Exposed #

If you're hitting exceptions when accessing Actuator endpoints, this is the most frequent culprit:

• First, confirm you've added the Actuator starter dependency in build.gradle:

  implementation 'org.springframework.boot:spring-boot-starter-actuator'
  

• By default, Spring Boot only enables the health endpoint and exposes it over HTTP. To expose all endpoints (or specific ones), add these lines to application.properties:

  management.endpoints.web.exposure.include=*
  management.endpoints.enabled-by-default=true
  

• Don't forget the default Actuator base path is /actuator—so valid URLs look like http://localhost:8080/actuator/health, not just /health.

2. REST Controller Configuration Problems #

Even though logs show requests are being received, incorrect controller setup can lead to unexpected behavior (like 404s or empty responses):

• Ensure your controller class uses @RestController (not just @Controller—that's for view-based apps).
• Double-check your request mapping annotations: if your controller has a top-level @RequestMapping("/api") and a method with @GetMapping("/greet"), the full endpoint URL is /api/greet.
• Verify your main application class (annotated with @SpringBootApplication) is in a parent package that includes your controller. Spring Boot auto-scans components in the same package or sub-packages by default. If your controller is in a separate package, add @ComponentScan(basePackages = "com.your.controller.package") to your main class.

3. Missing or Conflicting Dependencies #

• Make sure spring-boot-starter-web is present in your build.gradle—it's required for all REST endpoint functionality:

  implementation 'org.springframework.boot:spring-boot-starter-web'
  

• Run ./gradlew dependencies to check for dependency conflicts—look for duplicate or incompatible versions of Spring Boot-related libraries, which can cause runtime errors.

4. Port or Context Path Mismatch #

• Check application.properties for server.port (default is 8080)—if you changed it, you need to use that port in your request URLs.
• If you set server.servlet.context-path=/myapp, all endpoints get this prefix. For example, your REST endpoint becomes http://localhost:8080/myapp/your-path and Actuator becomes http://localhost:8080/myapp/actuator.

5. Unhandled Exceptions in the Application #

If you're seeing exceptions in the logs when accessing endpoints, look at the full stack trace. It might reveal issues like missing beans, invalid request payloads, or (if you're using a database) connection problems.

Once you share those code snippets and the exact exception messages from your Actuator access attempts, we can narrow this down to the exact root cause!

内容的提问来源于stack exchange，提问作者lapots