java - Maven – 文档中没有引用语法约束(DTD 或 XML Schema)

Question

我现在正在尝试学习如何使用 Apache Maven。我在 Eclipse 中编写了这段代码，它显示了消息:

No grammar constraints (DTD or XML Schema) referenced in the document.

<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>br.gov.mdic</groupId>
<artifactId>Offset</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<build>
<plugins>
    <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.0</version>
        <configuration>
            <source>1.8</source>
            <target>1.8</target>
        </configuration>
    </plugin>
</plugins>

Answer 1

您必须在 <project> 之前添加以下行标签

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xml>