Spring Boot Maven Plugin打包异常解决方案

【背景】spring-boot项目，打包成可执行jar，项目内有两个带有main方法的类并且都使用了@SpringBootApplication注解（或者另一种情形：你有两个main方法并且所在类都没有使用@SpringBootApplication注解），pom.xml如下

<plugin>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-maven-plugin</artifactId>
  <version>1.5.3.RELEASE</version>
  <executions>
    <execution>
      <goals>
        <goal>repackage</goal>
      </goals>
    </execution>
  </executions>
</plugin>

【问题】

执行mvn clean package，报错如下（说点不相关的，使用install同理。因为spring-boot:repackage目标（goal）（下文会说）被绑定在package构建阶段（phases），而package阶段在install阶段之前，指定构建阶段之前的阶段都会执行。详细参见：Introduction to the Build Lifecycle）

[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.5.3.RELEASE:repackage (default) on project webapps-api-bid: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:1.5.3.RELEASE:repackage failed: Unable to find a single main class from the following candidates [com.xx.api.main.ApiBidMain, com.xx.webapps.api.main.WebappsApiBidMain]

执行mvn clean package spring-boot:repackage，报错如下，不如上面日志详细

[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.5.3.RELEASE:repackage (default) on project webapps-api-bid: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:1.5.3.RELEASE:repackage failed: Unable to find main class

【解决】

Note：参考官网描述，没有指定<mainClass>或者继承了spring-boot-starter-parent并且<start-class>属性未配置时，会自动寻找签名是public static void main(String[] args)的方法… 所以插件懵逼了，两个妹子和谁在一起呢…

[推荐] 通用解决方法：<configuration>下配置mainClass，指定程序入口。

<plugin>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-maven-plugin</artifactId>
  <version>1.5.3.RELEASE</version>
  <configuration>
    <mainClass>com.xx.webapps.api.main.WebappsApiBidMain</mainClass>
  </configuration>
  <executions>
    <execution>
      <goals>
        <goal>repackage</goal>
      </goals>
    </execution>
  </executions>
</plugin&<mark>来源gaodaimacom搞#^代%!码网</mark>gt;

Spring Boot Maven Plugin提供了几个目标（goal），我们在<executions>标签里配置的<goal>repackage</goal>对应spring-boot:repackage这个目标。

• repackage: create a jar or war file that is auto-executable. It can replace the regular artifact or can be attached to the build lifecyle with a separate classifier.
• run: run your Spring Boot application with several options to pass parameters to it.
• start and stop: integrate your Spring Boot application to the integration-test phase so that the application starts before it.

The plugin rewrites your manifest, and in particular it manages theMain-ClassandStart-Classentries, so if the defaults don’t work you have to configure those there (not in the jar plugin). TheMain-Classin the manifest is actually controlled by thelayoutproperty of the boot plugin

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