springcloud负载项目maven打包没有main方法终极解决配置

父级pom

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>cn.top</groupId>
  <artifactId>top_im</artifactId>
  <version>1.0-SNAPSHOT</version>
  <modules>
    <module>im_server</module>
  </modules>
  <name>top_im</name>
  <packaging>pom</packaging>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <spring.boot.version>2.2.2.RELEASE</spring.boot.version>
    <spring.cloud.version>Hoxton.SR1</spring.cloud.version>
    <spring.cloud.alibaba.version>2.1.0.RELEASE</spring.cloud.alibaba.version>
    <mysql.version>8.0.18</mysql.version>
    <druid.version>1.1.18</druid.version>
    <druid.spring.boot.starter.version>1.1.10</druid.spring.boot.starter.version>
    <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
    <mybatis-spring-boot-starter.version>2.1.1</mybatis-spring-boot-starter.version>
    <mybatis-plus.version>3.3.0</mybatis-plus.version>
    <hutool-all.version>5.3.9</hutool-all.version>
    <swagger.version>2.1.6.RELEASE</swagger.version>
  </properties>

  <!--子模块继承后,提供作用:锁定版本+子module不用groupId和version-->
  <dependencyManagement>
    <dependencies>
      <!--springboot 2.2.2-->
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>${spring.boot.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <!--Spring cloud Hoxton.SR1-->
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>${spring.cloud.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <!--Spring cloud alibaba 2.1.0.RELEASE-->
      <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-alibaba-dependencies</artifactId>
        <version>${spring.cloud.alibaba.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql.version}</version>
      </dependency>
      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>${druid.version}</version>
      </dependency>
      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>${druid.spring.boot.starter.version}</version>
      </dependency>
     <!-- <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>${mybatis-spring-boot-starter.version}</version>
      </dependency>-->
      <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>${mybatis-plus.version}</version>
      </dependency>
      <dependency>
        <groupId>cn.hutool</groupId>
        <artifactId>hutool-all</artifactId>
        <version>${hutool-all.version}</version>
      </dependency>

    </dependencies>
  </dependencyManagement>

<!--  <build>
  <plugins>
    <plugin>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-maven-plugin</artifactId>
      <configuration>
        <fork>true</fork>
        <addResources>true</addResources>
      </configuration>
    </plugin>
  </plugins>
  </build>-->

  <build>
    <finalName>${project.name}</finalName>
    <resources>
      <resource>
        <directory>src/main/resources</directory>
      </resource>
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.xml</include>
        </includes>
      </resource>
    </resources>
    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-maven-plugin</artifactId>
          <version>${spring.boot.version}</version>
          <configuration>
            <fork>true</fork>
            <finalName>${project.build.finalName}</finalName>
          </configuration>
          <executions>
            <execution>
              <goals>
                <goal>repackage</goal>
              </goals>
            </execution>
          </executions>
        </plugin>
      </plugins>
    </pluginManagement>
    <plugins>
      <plugin>
        <groupId>org.sonarsource.scanner.maven</groupId>
        <artifactId>sonar-maven-plugin</artifactId>
        <version>3.6.0.1398</version>
      </plugin>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <configuration>
          <source>${java.version}</source>
          <target>${java.version}</target>
          <encoding>UTF-8</encoding>
          <compilerArgs>
            <arg>-parameters</arg>
          </compilerArgs>
        </configuration>
      </plugin>
    </plugins>
  </build>


  <pluginRepositories>
    <pluginRepository>
      <id>aliyun-plugin</id>
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </pluginRepository>
  </pluginRepositories>


</project>

子级pom

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <artifactId>top_im</artifactId>
    <groupId>cn.top</groupId>
    <version>1.0-SNAPSHOT</version>
  </parent>
  <groupId>cn.top</groupId>
  <artifactId>im_server</artifactId>
  <version>1.0-SNAPSHOT</version>
  <name>im_server</name>
  <packaging>jar</packaging>

  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <optional>true</optional>
    </dependency>

   <!-- <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
    </dependency>-->

    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-boot-starter</artifactId>
    </dependency>


    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid-spring-boot-starter</artifactId>
      <!--如果没写版本,从父层面找,找到了就直接用,全局统一-->
      <version>${druid.spring.boot.starter.version}</version>
    </dependency>
    <!--mysql-connector-java-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <!--jdbc-->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <!--热部署-->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-devtools</artifactId>
      <scope>runtime</scope>
      <optional>true</optional>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-generator</artifactId>
      <version>${mybatis-plus.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.velocity</groupId>
      <artifactId>velocity</artifactId>
      <version>1.7</version>
    </dependency>
    <dependency>
      <groupId>cn.songxinqiang</groupId>
      <artifactId>swagger-spring-boot-starter</artifactId>
      <version>${swagger.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-websocket</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.60</version>
    </dependency>
    <dependency>
      <groupId>cn.hutool</groupId>
      <artifactId>hutool-all</artifactId>
    </dependency>
    <dependency>
      <groupId>net.coobird</groupId>
      <artifactId>thumbnailator</artifactId>
      <version>0.4.9</version>
    </dependency>
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.4</version>
    </dependency>
    <!--//httpclient缓存-->
    <dependency>
      <groupId>org.apache.httpcomponents</groupId>
      <artifactId>httpclient-cache</artifactId>
      <version>4.5</version>
    </dependency>
    <!--//http的mime类型都在这里面-->
    <dependency>
      <groupId>org.apache.httpcomponents</groupId>
      <artifactId>httpmime</artifactId>
      <version>4.3.2</version>
    </dependency>

 <!--   <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.6</version>
    </dependency>-->

<!--    <dependency>
      <groupId>commons-httpclient</groupId>
      <artifactId>commons-httpclient</artifactId>
      <version>3.1</version>
    </dependency>-->

    <dependency>
      <groupId>org.apache.httpcomponents</groupId>
      <artifactId>httpclient</artifactId>
      <version>4.3.5</version>
    </dependency>

  </dependencies>

  <repositories>
    <repository>
      <id>nexus-aliyun</id>
      <name>Nexus aliyun</name>
      <layout>default</layout>
      <url>http://maven.aliyun.com/nexus/content/groups/public</url>
      <!--<url>http://192.168.3.17/nexus/content/repositories/releases/</url>-->
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <releases>
        <enabled>true</enabled>
      </releases>
    </repository>
  </repositories>

 <!-- <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>-->

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-antrun-plugin</artifactId>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>run</goal>
            </goals>
            <configuration>
              <tasks>
                <!--suppress UnresolvedMavenProperty -->
                <copy overwrite="true"
                      tofile="${session.executionRootDirectory}/target/${project.artifactId}.jar"
                      file="${project.build.directory}/${project.artifactId}.jar" />
              </tasks>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>


</project>

只要将复杂得<build>标签替换后  打包准有main方法