使用 Maven 2 构建可运行的 jar [英] Building a runnable jar with Maven 2

问题描述

我对 Maven 咒语比较陌生，但我正在尝试使用 Maven 构建一个命令行可运行 jar.我已经设置了我的依赖项，但是当我运行 mvn install 并尝试运行 jar 时，会发生两件事.首先，没有找到主类，这是可以纠正的.当我更正此问题后，我在运行时收到错误消息，指出找不到类.

I'm relatively new to the Maven mantra, but I'm trying to build a command-line runnable jar with Maven. I've setup my dependencies, but when I run mvn install and attempt to run the jar, two things happen. First, no main class is found, which is correctable. When I've corrected this, I get errors on run stating that classes cannot be found.

Maven 没有将我的依赖库打包在 jar 中，因此我无法将 jar 作为独立应用程序运行.我该如何纠正?

Maven is not packaging my dependency libraries inside of the jar, so I am unable to run the jar as a stand-alone application. How do I correct this?

推荐答案

最简单的方法是使用 maven-assembly-plugin 和预定义的 jar 创建程序集-with-dependencies 描述符.您还需要为这个 uber jar 生成一个带有主类条目的清单.下面的代码片段显示了如何配置程序集插件以执行此操作:

The easiest way to do this would be to create an assembly using the maven-assembly-plugin and the predefined jar-with-dependencies descriptor. You'll also need to generate a manifest with a main-class entry for this uber jar. The snippet below shows how to configure the assembly plugin to do so:

<build>
  <plugins>
    <plugin>
      <artifactId>maven-assembly-plugin</artifactId>
      <configuration>
        <descriptorRefs>
          <descriptorRef>jar-with-dependencies</descriptorRef>
        </descriptorRefs>
        <archive>
          <manifest>
            <mainClass>fully.qualified.MainClass</mainClass>
          </manifest>
        </archive>
      </configuration>
    </plugin>
  </plugins>
</build>

然后，要生成程序集，只需运行:

Then, to generate the assembly, just run:

mvn assembly:assembly

如果您想在构建过程中生成程序集，只需将 assembly:single mojo 绑定到包阶段:

If you want to generate the assembly as part of your build, simply bind the assembly:single mojo to the package phase:

<build>
  <plugins>
    <plugin>
      <artifactId>maven-assembly-plugin</artifactId>
      <configuration>
        <descriptorRefs>
          <descriptorRef>jar-with-dependencies</descriptorRef>
        </descriptorRefs>
        <archive>
          <manifest>
            <mainClass>fully.qualified.MainClass</mainClass>
          </manifest>
        </archive>
      </configuration>
      <executions>
        <execution>
          <phase>package</phase>
          <goals>
            <goal>single</goal>
          </goals>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>

然后简单地运行:

mvn package

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