Eclipse中创建Maven项目后缺失JRE系统库及Java目录问题

问题现象 #

在Eclipse中创建Maven项目后，无法获得Java支持：

• 缺失src/main/java、src/test/java目录
• 项目中没有JRE System Library

创建步骤：

File-->new-->project-->选择Maven project-->next-->勾选create a simple project-->next-->填写项目id和artifact id-->finish

问题截图：

项目pom.xml配置：

<?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>MavenProject1</groupId>
  <artifactId>MavenProject1</artifactId>
  <version>0.0.1-SNAPSHOT</version>

  <name>MavenProject1</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <!-- clean lifecycle -->
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- default lifecycle, jar packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-jar-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
        <!-- site lifecycle -->
        <plugin>
          <artifactId>maven-site-plugin</artifactId>
          <version>3.7.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-project-info-reports-plugin</artifactId>
          <version>3.0.0</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

解决方法 #

1. 手动添加源码目录 #

• 右键项目 → New → Folder，依次创建src/main/java、src/test/java目录
• 右键项目 → Build Path → Configure Build Path
• 在Source标签页，点击Add Folder，选中刚创建的两个目录，分别设置为Source folder和Test source folder

2. 关联JRE System Library #

• 右键项目 → Build Path → Add Libraries
• 选择JRE System Library → Next，选中本地已安装的JRE/JDK，点击Finish

3. 用Maven命令自动修复 #

• 右键项目 → Run As → Maven build...，在Goals中输入clean install并执行
• 执行完成后，右键项目 → Maven → Update Project...，勾选项目后点击OK

4. 检查Eclipse Maven配置（可选） #

• 打开Window → Preferences → Maven → Installations，确认已配置本地Maven路径
• 进入Maven → User Settings，确保settings.xml路径正确，配置了可用的镜像源

内容的提问来源于stack exchange，提问作者Achut Dudhe