项目结构图如下：
在SpringBoot多模块项目打包时遇见如下错误：
1、repackage failed: Unable to find main class -> [Help 1]
解决步骤：
（1）删除父pom中的build标签
（2）在web模块的pom中配置，指定启动类，其他模块中不需要配置：
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>com.dh.yjt.SpringBootDemo.SpringBootDemoApplication</mainClass>
</configuration>
</plugin>
</plugins>
</build>
2、[ERROR] /xxx.java:[16,39] 程序包com.xx..xxx不存在
解决办法：删除其他模块中的build标签
3、springboot打包与配置文件外置
https://blog.csdn.net/pei19890521/article/details/80984707
最终pom及package文件如下：
<?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">
<parent>
<artifactId>SpringBootDemo</artifactId>
<groupId>com.dh.yjt</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>mySystem-web</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging> <name>mySystem-web Maven Webapp</name>
<url>http://127.0.0.1/com.dh.yjt.SpringBootDemo.domain.index</url> <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>
</properties> <dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.dh.yjt</groupId>
<artifactId>mySystem-config</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.dh.yjt</groupId>
<artifactId>mySystem-dao</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.dh.yjt</groupId>
<artifactId>mySystem-common</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.dh.yjt</groupId>
<artifactId>mySystem-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.dh.yjt</groupId>
<artifactId>mySystem-domain</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>compile</scope>
</dependency> <!-- xml配置 -->
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-xml</artifactId>
</dependency>
<dependency>
<groupId>com.jd.jmq</groupId>
<artifactId>jmq-model</artifactId>
<version>2.1.4</version>
<scope>test</scope>
</dependency>
</dependencies> <build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.dh.yjt.SpringBootDemo.SpringBootDemoApplication</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<descriptors>
<descriptor>src/main/resources/package.xml</descriptor>
</descriptors>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
package.xml:
<?xml version="1.0" encoding="UTF-8"?>
<assembly
xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3 http://maven.apache.org/xsd/assembly-1.1.3.xsd">
<id>package</id>
<formats>
<format>tar.gz</format>
</formats>
<includeBaseDirectory>true</includeBaseDirectory>
<fileSets>
<fileSet>
<directory>${project.basedir}</directory>
<outputDirectory>/</outputDirectory>
<includes>
<include>*.sql</include>
<include>*.bat</include>
<include>*.md</include>
</includes>
</fileSet>
<fileSet>
<directory>${project.basedir}/src/main/resources/bin</directory>
<outputDirectory>../</outputDirectory>
<includes>
<include>bin/*.sh</include>
<include>*.sh</include>
</includes>
</fileSet>
<fileSet>
<directory>${project.basedir}/src/main/resources</directory>
<outputDirectory>/conf</outputDirectory>
<includes>
<include>config/*.xml</include>
<include>config/*.properties</include>
<include>*.properties</include>
</includes>
</fileSet>
<fileSet>
<directory>${project.build.directory}</directory>
<outputDirectory>/</outputDirectory>
<includes>
<include>*.jar</include>
</includes>
</fileSet>
</fileSets>
</assembly>