【发布时间】：2021-04-28 15:23:55
【问题描述】：
我是 Spring Boot 的新手，我正在尝试使用 REST Api 构建一个简单的应用程序，但在启动应用程序时我会立即收到此错误：
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-01-24 20:08:19.505 ERROR 11344 --- [ restartedMain] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
An attempt was made to call a method that does not exist. The attempt was made from the following location:
org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$EnableWebMvcConfiguration.requestMappingHandlerAdapter(WebMvcAutoConfiguration.java:369)
The following method did not exist:
'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration.requestMappingHandlerAdapter(org.springframework.web.accept.ContentNegotiationManager, org.springframework.format.support.FormattingConversionService, org.springframework.validation.Validator)'
The method's class, org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration, is available from the following locations:
jar:file:/C:/Users/user/.m2/repository/org/springframework/spring-webmvc/5.1.3.RELEASE/spring-webmvc-5.1.3.RELEASE.jar!/org/springframework/web/servlet/config/annotation/DelegatingWebMvcConfiguration.class
The class hierarchy was loaded from the following locations:
org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration: file:/C:/Users/user/.m2/repository/org/springframework/spring-webmvc/5.1.3.RELEASE/spring-webmvc-5.1.3.RELEASE.jar
org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport: file:/C:/Users/user/.m2/repository/org/springframework/spring-webmvc/5.1.3.RELEASE/spring-webmvc-5.1.3.RELEASE.jar
Action:
Correct the classpath of your application so that it contains a single, compatible version of org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration
Process finished with exit code 0
我还没有完成应用程序的开发，但由于这个错误，我无法继续。
到目前为止我的课程有：
pom.xml
<?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>2.4.2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>micro1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>micro1</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>javax.persistence-api</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<!-- <version>1.4.200</version>-->
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.19.1</version>
</plugin>
</plugins>
</build>
</project>
控制器：
package com.example.micro1.controllers;
import com.example.micro1.entities.User;
import com.example.micro1.services.Service;
import lombok.Data;
import org.springframework.web.bind.annotation.*;
@RestController
@RequestMapping("/users")
@Data
public class Controller {
private final Service service;
@PostMapping
User addNewUser(@RequestBody User user){
return service.add(user);
}
}
服务：
package com.example.micro1.services;
import com.example.micro1.entities.User;
import com.example.micro1.repositories.Repository;
import lombok.Data;
@org.springframework.stereotype.Service
@Data
public class Service {
private final Repository repository;
public User add(User user){
return repository.save(user);
}
}
存储库：
package com.example.micro1.repositories;
import com.example.micro1.entities.User;
import org.springframework.data.jpa.repository.JpaRepository;
@org.springframework.stereotype.Repository
public interface Repository extends JpaRepository<User, Integer> {
@Override
<S extends User> S save(S s);
}
目前只有一个实体：
package com.example.micro1.entities;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
private String name;
private String phoneNumber;
}
application.properties：
#h2
spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.h2.console.enabled=true
应用类：
package com.example.micro1;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Micro1Application {
public static void main(String[] args) {
SpringApplication.run(Micro1Application.class, args);
}
}
请告诉我是否还有其他要写的内容... 谢谢！
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标签： java spring spring-boot maven spring-mvc