[root@localhost cloud.netkiller.cn]# java -jar job-admin.jar 
no main manifest attribute, in job-admin.jar		
		
		

解压 jar 包，查看 META-INF/MANIFEST.MF 文件

		
[root@localhost ~]# unzip job-admin.jar		
[root@localhost ~]# cat META-INF/MANIFEST.MF 
Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Built-By: gitlab-runner
Created-By: Apache Maven 3.8.4
Build-Jdk: 1.8.0_312		
		
		

解决方法，pom.xml 中增加 repackage 配置项

		
		<plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring-boot.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
		
		

重新打包，再解压开查看 MANIFEST.MF 文件

		
[root@localhost ~]# cat META-INF/MANIFEST.MF 
Manifest-Version: 1.0
Spring-Boot-Classpath-Index: BOOT-INF/classpath.idx
Archiver-Version: Plexus Archiver
Built-By: gitlab-runner
Spring-Boot-Layers-Index: BOOT-INF/layers.idx
Start-Class: cn.netkiller.admin.Application
Spring-Boot-Classes: BOOT-INF/classes/
Spring-Boot-Lib: BOOT-INF/lib/
Spring-Boot-Version: 2.6.2
Created-By: Apache Maven 3.8.4
Build-Jdk: 1.8.0_312
Main-Class: org.springframework.boot.loader.JarLauncher