【发布时间】：2020-08-09 13:08:11
【问题描述】：
我已经按照标题搜索了这个问题，但仍然不知道该怎么办。我正在尝试构建一个可执行的 jar 文件，但其中一个插件 maven-assembly-plugin 无法解析。
我试过https://maven.apache.org/plugins/maven-assembly-plugin/usage.html
但它不起作用。我放了整个pom.xml文件，插件在文件底部。非常感谢任何帮助。
这是错误信息：
Plugin could not be resolved. Ensure the plugin's groupId, artifactId and
version are present. Additional information: Plugin
org.apache.maven.plugins:maven-assembly-plugin:2.2-beta-5 or one of its
dependencies could not be resolved: Failed to read
artifact descriptor for org.apache.maven.plugins:maven-assembly-plugin:jar:2.2-beta-5
这是文件：
<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>distributed.systems</groupId>
<artifactId>leader.election</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>leader.election</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.6.1</version>
</dependency>
</dependencies>
<build>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.7.1</version>
</plugin>
<plugin>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>3.0.0</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<release>14</release>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.3.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
<configuration>
<archive>
<manifest>
<mainClass>LeaderElection</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
</plugins>
</pluginManagement>
【问题讨论】：
-
尝试为插件提供groupId（在这种情况下为
org.apache.maven.plugins） -
谢谢，我试试。 @肾脏
-
有趣的是，它对我来说很好用。你或许可以尝试从
~/.m2/repository/org/apache/maven/plugins/maven-assembly-plugin/删除maven-assemply-plugin的本地缓存 -
除了您的问题：您在编译器插件中声明了
<maven.compiler.[source|target]>1.7和<release>14。这很矛盾。新的（从 Java 9 开始）<release>参数替换了旧的两个参数，也可以通过<properties>/<maven.compiler.release>14设置，而不是在编译器插件中配置它，并且是 preferred for cross-compiling。 -
谢谢，@GeroldBroser。这是我需要注意的另一部分。