弹簧靴无法运行

Question

我正确地制作了 maven，当我在主类中运行时给我错误线程“main”java.lang.Error 中的异常：未解决的编译问题：SpringApplication 无法解决

Java

@SpringBootApplication
public class CourseApiapp {

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

pom.xml

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-rest</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </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>
        </plugin>
    </plugins>
</build>

Answer 1

我认为您必须指向存储依赖项的父 POM：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.6.RELEASE</version>
</parent>

Answer 2

1. 修复你的 pom 格式错误。这是一个从 start.spring.io 生成的工作

   <?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
       <modelVersion>4.0.0</modelVersion>
   
       <groupId>com.example</groupId>
       <artifactId>demo</artifactId>
       <version>0.0.1-SNAPSHOT</version>
       <packaging>jar</packaging>
   
       <name>demo</name>
       <description>Demo project for Spring Boot</description>
   
       <parent>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-parent</artifactId>
           <version>1.5.6.RELEASE</version>
           <relativePath/> <!-- lookup parent from repository -->
       </parent>
   
       <properties>
           <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
           <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
           <java.version>1.8</java.version>
       </properties>
   
       <dependencies>
           <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-web</artifactId>
           </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>
               </plugin>
           </plugins>
       </build>
   
   
   </project>
   

2. 或者，如果您使用的是 IntelliJ IDEA 或 Eclipse 等 IDE，请确保重新 导入项目。 这是一个如何在eclipse中刷新maven依赖的答案

   How to update maven repository in Eclipse?

3. 如果您想从终端构建，则可选。尝试运行 控制台中的以下命令

       mvn spring-boot:run