为什么我得到"没有找到汇编描述符." 构建此项目时出错？

Question

我有一个用Kotlin写的小项目.当我运行时clean compile assembly:single install,我收到以下错误消息:

Failed to execute goal org.apache.maven.plugins:maven-assembly-plugin:2.2-beta-5:single 
(default-cli) on project alma-econsim: Error reading assemblies: No assembly 
descriptors found. -> [Help 1]

我jar-with-dependencies.xml位于src/main/assembly中,并在pom.xml中引用,如下所示:

<plugin>
    <artifactId>maven-assembly-plugin</artifactId>
    <version>2.2-beta-5</version>
    <executions>
        <execution>
            <id>assembly</id>
            <goals>
                <goal>single</goal>
            </goals>
            <phase>package</phase>
            <configuration>
                <descriptors>
                    <descriptor>src/main/assembly/jar-with-dependencies.xml</descriptor>
                </descriptors>
            </configuration>
        </execution>
    </executions>
</plugin>

但我仍然得到错误.我如何更正我的项目,以便能够将其打包为具有依赖关系的jar？

Answer 1

首先使用maven-assembly-plugin的uptodate版本而不是古老的版本...此外你应该通过mvn clean package将maven-assembly-plugin绑定到package生命周期阶段来调用它...如果你试图这样做mvn ... assembly:single你不是调用生命周期...除此之外,你想使用jar-with-dependencies描述符,你应该这样做:

<project>
  [...]
  <build>
    [...]
    <plugins>
      <plugin>
        <!-- NOTE: We don't need a groupId specification because the group is
             org.apache.maven.plugins ...which is assumed by default.
         -->
        <artifactId>maven-assembly-plugin</artifactId>
        <version>2.6</version>
        <configuration>
          <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
          </descriptorRefs>
        </configuration>
        [...]
</project>

除此之外,如果你像这样打电话给Maven:

mvn clean compile assembly:single install

比你调用编译阶段double,只是简单地:

mvn clean install 

足够了.我可以推荐阅读构建生活文档.