springboot注释和导入不能在Intellij-IDE上解析

Cannot resolve @SpringBootApplication

pom.xml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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.in28minutes.database</groupId>
    <artifactId>database-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>database-demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.11.RELEASE</version>
        <!--<version>1.5.2.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-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </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-actuator</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>


</project>

我有另一个设置,使用的是springboot1.5.2.RELEASE。

看来,所有进口的新项目都在抛出同样的问题。 例如。 https://github.com/callicoder/spring-boot-actuator-demo

更新

我意识到我的主要项目有一些依赖性(maven存储库从远程服务器下载)。其定义见.m2/设置.xml.

[错误]无法在项目执行器演示上执行目标:无法解析项目的依赖项com.示例:执行机构-演示:jar:0.0.1-SNAPSHOT:未能在处收集依赖项org.springframework.boot:弹簧靴启动器-执行机构:震击器:2.1.11.RELEASE:未能读取的项目描述符org.springframework.boot:弹簧靴启动器-执行机构:震击器:2.1.11.RELEASE:无法传输项目org.springframework.boot:弹簧靴启动器-执行机构:pom:2.1.11.从/到nexus的释放( https://project.repository.com/repository/maven-public/ ):无法传输文件: https://project.repository.com/repository/maven-public/org/springframework/boot/spring-boot-starter-actuator/2.1.11.RELEASE/spring-boot-starter-actuator-2.1.11.RELEASE.pom . 返回代码为:502,Rea十四行诗:坏网关。->[帮助1]

我备份了设置.xml然后把它取下来。我运行了mvncleanfresh,这次它从mvn远程存储库下载了工件,问题得到了解决。

不确定什么是正确的切换方式设置.xml对于我的工作项目和演示项目,因为前者需要这些设置。