REST 控制器在 Spring Boot 3.0.3 应用程序中找不到。我没有找到任何好的解决方案

问题描述 投票：0回答：2

我有一个带有 spring boot 3.0.3 的小玩具示例。

这是我的两个简单课程：

package org.crea.water4agrifoodmock;

import org.crea.water4agrifoodmock.controller.ModelMockerController;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

// added this @SpringBootApplication(scanBasePackages = {"org.crea.water4agrifoodmock", "org.crea.water4agrifoodmock.controller"}) but without valid result
@SpringBootApplication
public class Water4AgriFoodMockApplication {

    public static void main(String[] args) {
        SpringApplication.run(
                Water4AgriFoodMockApplication.class, args);
    }
}

和控制器：

package org.crea.water4agrifoodmock.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping(name = "/api/v1")
public class ModelMockerController {

    @GetMapping(name = "/mock")
    public String hello(){
        return "Hello";
    }
}

最佳实践是将 Main Application 类放在项目的根目录下。这样，它会自动扫描并找到子包中可用的 Controller 类。例如，这是在这个page中工作的包结构：

我在 Postman 收到这个错误信息：

我的pom文件：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.0.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>org.crea</groupId>
    <artifactId>water4agrifood-mock</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>water4agrifood-mock</name>
    <description>Demo project water4agrifood-mockSpring Boot</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

这是运行视图

.   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v3.0.3)

2023-02-28T16:17:47.705+01:00  INFO 15268 --- [           main] o.c.w.Water4AgriFoodMockApplication      : Starting Water4AgriFoodMockApplication using Java 19.0.1 with PID 15268 (C:\Users\*****\spring-boot-water4agrifood-model-mocker\water4agrifood-mock\target\classes started by ***** in C:\Users\*****\spring-boot-water4agrifood-model-mocker\water4agrifood-mock)
2023-02-28T16:17:47.708+01:00  INFO 15268 --- [           main] o.c.w.Water4AgriFoodMockApplication      : No active profile set, falling back to 1 default profile: "default"
2023-02-28T16:17:48.409+01:00  INFO 15268 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2023-02-28T16:17:48.416+01:00  INFO 15268 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2023-02-28T16:17:48.416+01:00  INFO 15268 --- [           main] o.apache.catalina.core.StandardEngine    : Starting Servlet engine: [Apache Tomcat/10.1.5]
2023-02-28T16:17:48.489+01:00  INFO 15268 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2023-02-28T16:17:48.490+01:00  INFO 15268 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 737 ms
2023-02-28T16:17:48.658+01:00 DEBUG 15268 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : ControllerAdvice beans: 0 @ModelAttribute, 0 @InitBinder, 1 RequestBodyAdvice, 1 ResponseBodyAdvice
2023-02-28T16:17:48.721+01:00 DEBUG 15268 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : 2 mappings in 'requestMappingHandlerMapping'
2023-02-28T16:17:48.733+01:00 DEBUG 15268 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Patterns [/webjars/**, /**] in 'resourceHandlerMapping'
2023-02-28T16:17:48.738+01:00 DEBUG 15268 --- [           main] .m.m.a.ExceptionHandlerExceptionResolver : ControllerAdvice beans: 0 @ExceptionHandler, 1 ResponseBodyAdvice
2023-02-28T16:17:48.792+01:00  INFO 15268 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2023-02-28T16:17:48.799+01:00  INFO 15268 --- [           main] o.c.w.Water4AgriFoodMockApplication      : Started Water4AgriFoodMockApplication in 1.427 seconds (process running for 1.927)
2023-02-28T16:17:53.490+01:00  INFO 15268 --- [nio-8080-exec-4] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2023-02-28T16:17:53.490+01:00  INFO 15268 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2023-02-28T16:17:53.490+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Detected StandardServletMultipartResolver
2023-02-28T16:17:53.490+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Detected AcceptHeaderLocaleResolver
2023-02-28T16:17:53.490+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Detected FixedThemeResolver
2023-02-28T16:17:53.490+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Detected org.springframework.web.servlet.view.DefaultRequestToViewNameTranslator@6deaf644
2023-02-28T16:17:53.491+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Detected org.springframework.web.servlet.support.SessionFlashMapManager@57d613cd
2023-02-28T16:17:53.491+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : enableLoggingRequestDetails='false': request parameters and headers will be masked to prevent unsafe logging of potentially sensitive data
2023-02-28T16:17:53.491+01:00  INFO 15268 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Completed initialization in 1 ms
2023-02-28T16:17:53.497+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : GET "/api/v1/mock", parameters={}
2023-02-28T16:17:53.508+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped to ResourceHttpRequestHandler [classpath [META-INF/resources/], classpath [resources/], classpath [static/], classpath [public/], ServletContext [/]]
2023-02-28T16:17:53.515+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.w.s.r.ResourceHttpRequestHandler     : Resource not found
2023-02-28T16:17:53.516+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Completed 404 NOT_FOUND
2023-02-28T16:17:53.520+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : "ERROR" dispatch for GET "/error", parameters={}
2023-02-28T16:17:53.521+01:00 DEBUG 15268 --- [nio-8080-exec-4] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController#error(HttpServletRequest)
2023-02-28T16:17:53.541+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.w.s.m.m.a.HttpEntityMethodProcessor  : Using 'application/json', given [*/*] and supported [application/json, application/*+json]
2023-02-28T16:17:53.543+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.w.s.m.m.a.HttpEntityMethodProcessor  : Writing [{timestamp=Tue Feb 28 16:17:53 CET 2023, status=404, error=Not Found, path=/api/v1/mock}]
2023-02-28T16:17:53.571+01:00 DEBUG 15268 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Exiting from "ERROR" dispatch, status 404

添加后

logging.level.root=DEBUG
（只是部分）

javax.management.InstanceNotFoundException: org.springframework.boot:type=Admin,name=SpringApplication
    at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getMBean(DefaultMBeanServerInterceptor.java:1079) ~[na:na]
    at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:637) ~[na:na]
    at java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:679) ~[na:na]
    at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1449) ~[na:na]
    at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1310) ~[na:na]
    at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1405) ~[na:na]
    at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.getAttribute(RMIConnectionImpl.java:639) ~[na:na]
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:578) ~[na:na]
    at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:360) ~[na:na]
    at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200) ~[na:na]
    at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197) ~[na:na]
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:712) ~[na:na]
    at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196) ~[na:na]
    at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:598) ~[na:na]
    at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:844) ~[na:na]
    at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:721) ~[na:na]
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399) ~[na:na]
    at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:720) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[na:na]
    at java.base/java.lang.Thread.run(Thread.java:1589) ~[na:na]



2023-02-28T16:44:36.181+01:00 DEBUG 14952 --- [           main] _.s.web.servlet.HandlerMapping.Mappings  : 
    o.s.b.a.w.s.e.BasicErrorController:
    { [/error]}: error(HttpServletRequest)
    { [/error], produces [text/html]}: errorHtml(HttpServletRequest,HttpServletResponse)
java spring spring-boot controller http-status-code-404
2个回答
0
投票

name
和
@RequestMapping
中的
@GetMapping
属性只是配置映射的名称。它与 API 路径无关。您应该改用 
path
或 
value
:

@RestController
@RequestMapping("/api/v1")
public class ModelMockerController {

    @GetMapping("/mock")
    public String hello(){
        return "Hello";
    }
}

或

@RestController
@RequestMapping(path = "/api/v1")
public class ModelMockerController {

    @GetMapping(path = "/mock")
    public String hello(){
        return "Hello";
    }
}
-1
投票

U 应该在注释中写值而不是名称 

@RequestMapping(value = "/api/v1")
@GetMapping(value = "/mock")

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