1、 Problem description

1.1 development environment configuration

pom.xml

<plugin>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-maven-plugin</artifactId>
	<!--Be sure to match the springboot version number, because the new version of springboot no longer sets the dependencies of this plugin-->
	<version>${spring-boot.version}</version>
	<executions>
		<execution>
			<goals>
				<goal>repackage</goal>
			</goals>
		</execution>
	</executions>
</plugin>

1.2 error

[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.1.17.RELEASE:repackage (default) on project taco-cloud-eureka-server: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:2.1.17.RELEASE:repackage failed: Unable to find a single main class from the following candidates [com.xxx.xxx.Application, com.xxx.xxx.Application]

II. Solution

2.1 Remove repackage and use mainclass instead

Configure in the top-level parent project pom.xml

<properties>
	<! --needs to be overridden by subclasses to resolve multiple main methods-->
	<mainClass>com.taco.springcloud.Application</mainClass>
</properties>

<plugin>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-maven-plugin</artifactId>
	<!--Be sure to match the springboot version number, because the new version of springboot no longer sets the dependencies of this plugin-->
	<version>${spring-boot.version}</version>
	<configuration>
		<mainClass>${mainClass}</mainClass>
	</configuration>
</plugin>

Override the mainclass attribute in POM. XML projects that need to be deployed as web projects

<properties>
	<mainClass>com.taco.springcloud.TacoConfigServerApplication</mainClass>
</properties>

In this way, even if there are other main methods in the dependent package, no error will be reported