\SpringBootDemo-1.0-SNAPSHOT.jar中没有主清单属性-CFANZ编程社区

背景：

 java -jar .\SpringBootDemo-1.0-SNAPSHOT.jar --spring.profiles.active=dev

在运行打包以后的maven项目时，出现了如下报错信息
$\SpringBootDemo-1.0-SNAPSHOT.jar中没有主清单属性_maven$

解决办法：

1、需要在项目根目录下的pom.xml文件中添加SpringBoot 构建的插件

  
    
      
        org.springframework.boot
        spring-boot-maven-plugin
        
          
            
              repackage

$\SpringBootDemo-1.0-SNAPSHOT.jar中没有主清单属性_maven_02$

pom.xml文件内容如下：



  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  4.0.0

  com.zoneber
  SpringBootDemo
  1.0-SNAPSHOT

  SpringBootDemo
  
  http://www.example.com

  
    UTF-8
    1.7
    1.7
  

  
  
    org.springframework.boot
    spring-boot-starter-parent
    2.3.5.RELEASE
     
  

  
    
    
      org.springframework.boot
      spring-boot-starter-web
    

    
    
      org.springframework.boot
      spring-boot-starter-test
      test
    


    
      junit
      junit
      4.11
      test
    
  

  
    
      
        
        
          maven-clean-plugin
          3.1.0
        
        
        
          maven-resources-plugin
          3.0.2
        
        
          maven-compiler-plugin
          3.8.0
        
        
          maven-surefire-plugin
          2.22.1
        
        
          maven-jar-plugin
          3.0.2
        
        
          maven-install-plugin
          2.5.2
        
        
          maven-deploy-plugin
          2.8.2
        
        
        
          maven-site-plugin
          3.7.1
        
        
          maven-project-info-reports-plugin
          3.0.0
        
      
    

    
    
      
        org.springframework.boot
        spring-boot-maven-plugin
        
          
            
              repackage

注意：XML结构不能乱，否则无法正常打包

2、然后通过 mvn install 命令重新安装项目依赖

在运行mvn install的时候，自动生成这些主清单属性，运行java -jar xxx.jar时会根据主清单属性找到启动类，从而启动程序

3、再次通过mvn package 命令对maven项目进行打包

D:\IdeaProjects\SpringBootDemo>mvn package
[INFO] Scanning for projects...
[INFO]
[INFO] ---------------------< com.zoneber:SpringBootDemo >---------------------
[INFO] Building SpringBootDemo 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-resources-plugin:3.0.2:resources (default-resources) @ SpringBootDemo ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 4 resources
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.0:compile (default-compile) @ SpringBootDemo ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:3.0.2:testResources (default-testResources) @ SpringBootDemo ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory D:\IdeaProjects\SpringBootDemo\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.0:testCompile (default-testCompile) @ SpringBootDemo ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-surefire-plugin:2.22.1:test (default-test) @ SpringBootDemo ---
[INFO]
[INFO] -------------------------------------------------------
[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO]
[INFO] Results:
[INFO]
[INFO] Tests run: 0, Failures: 0, Errors: 0, Skipped: 0
[INFO]
[INFO]
[INFO] --- maven-jar-plugin:3.0.2:jar (default-jar) @ SpringBootDemo ---
[INFO] Building jar: D:\IdeaProjects\SpringBootDemo\target\SpringBootDemo-1.0-SNAPSHOT.jar
[INFO]
[INFO] --- spring-boot-maven-plugin:2.3.5.RELEASE:repackage (repackage) @ SpringBootDemo ---
[INFO] Replacing main artifact with repackaged archive
[INFO]
[INFO] --- spring-boot-maven-plugin:2.3.5.RELEASE:repackage (default) @ SpringBootDemo ---
[INFO] Replacing main artifact with repackaged archive
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  3.820 s
[INFO] Finished at: 2022-05-27T16:52:50+08:00
[INFO] ------------------------------------------------------------------------

4、然后根据提示找到jar包存放的位置

$\SpringBootDemo-1.0-SNAPSHOT.jar中没有主清单属性_maven_03$

$\SpringBootDemo-1.0-SNAPSHOT.jar中没有主清单属性_jar_04$

对jar包进行解压，以查看是否包含主清单属性需要的BOOT-INF，META-INF，org这三个文件夹

$\SpringBootDemo-1.0-SNAPSHOT.jar中没有主清单属性_maven_05$

并且打开META-INF文件夹中的MANIFEST.MF文件查看程序的入口以及版本信息

Manifest-Version: 1.0
Implementation-Title: SpringBootDemo
Implementation-Version: 1.0-SNAPSHOT
Built-By: admin
Implementation-Vendor-Id: com.zoneber
Spring-Boot-Version: 2.3.5.RELEASE
Main-Class: org.springframework.boot.loader.JarLauncher
Spring-Boot-Classpath-Index: BOOT-INF/classpath.idx
Start-Class: com.zoneber.MyApplication
Spring-Boot-Classes: BOOT-INF/classes/
Spring-Boot-Lib: BOOT-INF/lib/
Created-By: Apache Maven 3.8.4
Build-Jdk: 1.8.0_40
Implementation-URL: http://www.example.com

Main-Class 代表了Spring Boot中启动jar包的程序
Start-Class 属性就代表了Spring Boot程序的入口类，这个类中应该有一个main方法
Spring-Boot-Classes 代表了类的路径，所有编译后的class文件，以及配置文件，都存储在该路径下
Spring-Boot-Lib 表示依赖的jar包存储的位置

这些值都是SpringBoot打包插件会默认生成的，如果没有这些属性，SpringBoot程序自然不能运行，就会报错：jar中没有主清单属性，也就是说没有按照SpringBoot的要求，生成这些必须的属性

5、然后通过java命令启动该项目，并激活开发环境（dev）的 Profile。

java -jar .\SpringBootDemo-1.0-SNAPSHOT.jar --spring.profile.active=dev

其中 --spring.profiles.active=dev 为激活开发环境（dev）Profile 的命令行参数

启动成功的效果图如下：

$\SpringBootDemo-1.0-SNAPSHOT.jar中没有主清单属性_spring_06$