为什么spring-boot应用程序中pom.xml的第一行显示错误... <？xml version =“ 1.0” encoding =“ UTF-8”？>

Question

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
    </parent>
    <groupId>com.app</groupId>
    <artifactId>Demo</artifactId>
    <version>1.0</version>
    <name>Demo</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</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>
            </plugin>
        </plugins>
    </build>

</project>

Answer 1

只需编辑文件 pom.xml 的属性
<properties> <java.version>1.8</java.version> <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version> </properties>

Answer 2

2.1.5.RELEASE中会发生这种情况。将以下条目添加到pom中以解决该问题。

<properties>
    <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
</properties>

为什么从Spring Boot版本2.1.4更改为2.1.5会给出未知的配置Maven错误？