问Spring :如何指定位于内部lib中的主类

EN

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <version>1.3.2.RELEASE</version>
            <executions>
                <execution>
                    <goals>
                        <goal>repackage</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <mainClass>my.internal.lib.Main</mainClass>
            </configuration>
        </plugin>
    </plugins>
</build>

-- com
   -- my
      -- spring
          -- boot
              RestRunner.java
              App.java 

-- lib 
    -- my-internal-lib.jar (my.internal.lib.Main.java)

-- META-INF 
    -- maven
    -- MANIFEST.MF
-- org 
application.properties

package my.internal.lib;
public class Main {
    public static void main(String[] args){
        new RestRunner().start(args);           
    }
}

package com.my.spring.boot;
public class RestRunner{

    public boolean start(String[] args){
        SpringApplication.run(App.class, args);
    }
}

package com.my.spring.boot;
@SpringBootApplication(scanBasePackages = {"com.my.spring.boot"})
public class App {}

Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Built-By: ...
Start-Class: my.internal.lib.Main
Spring-Boot-Version: 1.3.2.RELEASE
Created-By: Apache Maven 3.3.9
Build-Jdk: 1.8.0_112
Main-Class: org.springframework.boot.loader.JarLauncher

java.lang.ClassNotFoundException: my.internal.lib.Main
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)