Maven生成可执行的jar main manifest

大意翻译自https://maven.apache.org/shared/maven-archiver/examples/classpath.html

问题描述
pom文件如下

<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.yq</groupId>
  <artifactId>mongo</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>mongo demo</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <slf4j.version>1.7.7</slf4j.version>
    <log4j.version>1.2.17</log4j.version>
  </properties>

  <dependencies>
    <dependency>
        <groupId>org.mongodb</groupId>
        <artifactId>mongo-java-driver</artifactId>
        <version>3.4.3</version>
    </dependency>
    <!-- log4j日志文件管理包版本 -->
    <!-- 日志文件管理包 -->
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>${log4j.version}</version>
     </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>${slf4j.version}</version>
      </dependency>
      <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>${slf4j.version}</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <description>This is mongo conn and crud operations demo program.</description>

  <scm>
    <developerConnection>yqbjtu</developerConnection>
    <url>https://github.com/yqbjtu/mongodbTutorial.git</url>
    <connection>https</connection>
  </scm>
  <issueManagement>
    <url>https://github.com/yqbjtu/mongodbTutorial/issues</url>
  </issueManagement>

</project>

默认mvn package生成的jar文件没有main manifest， 当执行java -jar的时候，错误如下
C:\E\workspace45\mongo\target>java -jar mongo-0.0.1-SNAPSHOT.jar
no main manifest attribute, in mongo-0.0.1-SNAPSHOT.jar

如何在生成的jar中添加设置Main-Class: com.yq.mongo.App。
修改pom.xml文件，添加

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        ...
        <configuration>
          <archive>
            <manifest>
              <addClasspath>true</addClasspath>
              <mainClass>**fully.qualified.MainClass**</mainClass>
            </manifest>
          </archive>
        </configuration>
        ...
      </plugin>
    </plugins>
  </build>

最后生成文件可以通过java -jar执行。

更多内容可参考https://maven.apache.org/shared/maven-archiver/examples/classpath.html