我用mvn 建立了一个java工程,
工程目录如下:
C:\demo\src\main\app\App.java, 这里有main函数
我现在想把工程打包成可执行的jar包
从网上查需要maven-shade-plugin-1.2.1.jar这个插件(我不知道要不要下载)
我已经下载了这个软件。pom.xml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>org.test</groupId>
  <artifactId>demo</artifactId>
  <version>1.0</version>
  <packaging>jar</packaging>  <name>demo</name>
  <url>http://maven.apache.org</url>  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
<build>   
       <plugins>   
           <plugin>   
              <groupId>org.apache.maven.plugins</groupId>   
              <artifactId>maven-shade-plugin</artifactId>   
              <version>1.2.1</version>   
              <executions>   
                 <execution>   
                    <phase>package</phase>   
                    <goals>   
                       <goal>shade</goal>   
                    </goals>   
                    <configuration>   
                       <transformers>   
                           <transformer    
        implementation="org.apache.maven.plugins.shade   
                          .resource.ManifestResourceTransformer">    
<mainClass>demo.src.main.java.app.App</mainClass>     
                           </transformer>   
                       </transformers>    
                    </configuration>    
                 </execution>   
              </executions>   
           </plugin>   
       </plugins>   
    </build>  
</project>在命令行下:
mvn  clean  intall  报错。请问我下载的插件的jar文件应该放在什么地方,怎么放?
运行什么命令把demo打包成可执行jar,
用什么命令运行?