spring boot 打包问题

[INFO] Final Memory: 17M/225M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.0.0.RELEASE:repackage (default) on project demo-service: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:2.0.0.RELEASE:repackage failed: Unable to find main class -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException

Process finished with exit code 1

出现这种错误的原因是

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>
这个插件，这里引入了spring-boot-maven-plugin，打包时会去扫描项目main方法入口，也就是说引入该配置，你就必须在项目src/main/java/下创建一个spring-boot启动类：

解决方案：

1. 添加spring-boot启动类。

2. 将pom.xml中的spring-boot-maven-plugin相关配置注释掉

3. pom.xml中spring-boot-maven-plugin相关配置修改为普通的maven--plugin配置即可。