背景:

pom.xml 里面 plugin 的配置如下:

                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-assembly-plugin</artifactId>
                    <version>3.1.1</version>
                    <configuration>
                        <finalName>${project.artifactId}</finalName>
                        <appendAssemblyId>true</appendAssemblyId>
                        <descriptors>
                            <descriptor>src/main/assembly/client-jar.xml</descriptor>
                        </descriptors>
                    </configuration>
                    <executions>
                        <execution>
                            <id>make-assembly</id>
                            <phase>package</phase>
                            <goals>
                                <goal>single</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>

src/main/assembly/client-jar.xml 配置如下:

<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
    <id>client</id>
    <formats>
        <format>jar</format>
    </formats>
    <includeBaseDirectory>false</includeBaseDirectory>
    <fileSets>
        <fileSet>
            <directory>target/classes</directory>
            <includes>  
                <include>**/embedclient/**</include>
                <include>**/model/**</include>  
            </includes> 
            <outputDirectory>${file.separator}</outputDirectory>
        </fileSet>
    </fileSets>
</assembly>

执行命令 mvn assembly:single 的时候出现下面错误:

[INFO] Scanning for projects...
[WARNING] Failed to build parent project for xxx.xxxx.xxx:xxx:war:0.0.1
[INFO]
[INFO] ------------------< xxx.xxxx.xxx:xxx >-------------------
[INFO] Building xxx Maven Webapp 0.0.1-SNAPSHOT
[INFO] --------------------------------[ war ]---------------------------------
[INFO]
[INFO] --- maven-assembly-plugin:3.1.1:single (default-cli) @ xxx ---
[INFO] Reading assembly descriptor: src/main/assembly/client-jar.xml
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  1.430 s
[INFO] Finished at: 2021-06-01T14:45:20+08:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-assembly-plugin:3.1.1:single (default-cli) on project xxx: Failed to creat
e assembly: Error creating assembly archive client: archive cannot be empty -> [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/MojoExecutionException

在网上收了半天没有发现有 archive cannot be empty 相关错误， 后面想着 存档不能为空 是不是没有相关 class 文件的原因，先执行一下 clean 和 compile，再执行 assembly 就好了，具体命令:

mvn clean
mvn compile
mvn assembly:single