将 Spring 引导父级导入 Pom.xml 时出错

Question

I am trying to create a sample Spring-Boot project using maven but when i imported into Eclipse. I am getting an error in Pom.xml about spring-boot parent but when i run mvn command from terminal. It works fine. Also, in main class, it does not recognize org.springframework.*

I am getting an error which says that

Project build error: Non-resolvable parent POM: Failure to transfer org.springframework.boot:spring-boot-starter-parent:pom:2.3.0.RELEASE from http://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact org.springframework.boot:spring-boot-starter-parent:pom:2.3.0.RELEASE from/to central (http://repo.maven.apache.org/maven2): Failed to transfer http://repo.maven.apache.org/maven2/org/springframework/boot/spring-boot-starter-parent/2.3.0.RELEASE/spring-boot-starter-parent-2.3.0.RELEASE.pom. Error code 501, HTTPS Required and 'parent.relativePath' points at wrong local POM

My Pom.xml looks like this

    <?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>2.3.0.RELEASE</version>
        <!-- <relativePath /> -->
    </parent>
    <groupId>com.test</groupId>
    <artifactId>products</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>products</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.3.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>2.3.0.RELEASE</version>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.3.0.RELEASE</version>
            </plugin>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

Answer 1

Error code 501, HTTPS Required - this error indicates that you are trying to connect to maven central repository using HTTP protocol

From beginning of 2020, maven central supports communication over HTTPS only. See this page for more details

Verify your maven settings. If you have configured maven central repository with http urls http://repo1.maven.org or http://repo.maven.apache.org/ switch url to https

Answer 2

Try adding repository in pom.xml. Also make sure you have proper internet connection so that dependencies will get downloaded from repo.

<repositories>
        <repository>
            <id>spring-snapshots</id>
            <url>http://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <url>http://repo.spring.io/milestone</url>
        </repository>
    </repositories>