如何告诉Maven将所有依赖项重新打包到一个jar文件中

Question

给定一个包含依赖项列表的pom.xml文件，是否有Maven命令将所有这些jar包装成一个大jar？我不想在构建中包含我的.class文件 - 我只想在构建中包含库.class / jar文件 - 有没有办法做到这一点？

我看到这个插件：

 <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <executions>
        <execution>
            <id>copy-dependencies</id>
            <phase>prepare-package</phase>
            <goals>
                <goal>copy-dependencies</goal>
            </goals>
            <configuration>
                <outputDirectory>${project.build.directory}/Crunchify/lib</outputDirectory>
                <overWriteReleases>false</overWriteReleases>
                <overWriteSnapshots>false</overWriteSnapshots>
                <overWriteIfNewer>true</overWriteIfNewer>
            </configuration>
        </execution>
    </executions>
</plugin>

1. 我无法弄清楚它将依赖项复制到哪里 - 即使我硬编码路径而不是${project.build.directory}/Crunchify/lib，也没有任何内容写入该位置，
2. 我假设它是复制jar，但不是将多个jar的内容放入一个大的jar文件中。

我也看到了这个常见的插件：

http://maven.apache.org/plugins/maven-assembly-plugin/usage.html

     <plugin>
        <artifactId>maven-assembly-plugin</artifactId>
        <version>3.1.1</version>
        <configuration>
          <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
          </descriptorRefs>
        </configuration>
        <executions>
          <execution>
            <id>make-assembly</id> <!-- this is used for inheritance merges -->
            <phase>package</phase> <!-- bind to the packaging phase -->
            <goals>
              <goal>single</goal>
            </goals>
          </execution>
        </executions>
      </plugin>

但是当我用pom.xml中存在的mvn clean package运行maven-assembly-plugin时，我没有看到任何新的jar文件。

Answer 1

Wit jar-with-dependencies和single~package，你陷入了装配的“GOTCHAS”之一（包装之前没有任何装配（未完成））。

但结合两个插件，这将工作：

/pom.xml

<project>
   ...
    <!-- many many dependencies -->
    <build>
        <plugins>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>3.1.1</version>
                <configuration>
                    <descriptors>
                        <descriptor>src/assembly/assembly.xml</descriptor>
                    </descriptors>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>3.1.1</version>
                <executions>
                    <execution>
                        <id>copy-deps</id>
                        <phase>process-sources</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

/src/assembly/assembly.xml

<assembly xmlns="http://maven.apache.org/ASSEMBLY/2.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/ASSEMBLY/2.0.0 http://maven.apache.org/xsd/assembly-2.0.0.xsd">
  <id>big-big-jar</id>
  <formats>
    <format>jar</format>
  </formats>
  <includeBaseDirectory>false</includeBaseDirectory>
  <fileSets>
    <fileSet>
      <directory>${project.build.directory}/dependency</directory>
      <outputDirectory />
      <includes>
        <!-- attention: maybe you need more ... zip, tz.gz.bz. -->
        <include>*.jar</include>
      </includes>
    </fileSet>
  </fileSets>
</assembly>

cmd

mvn clean package
...
BUILD SUCCESS

......会给你一个：

/target/${build.finalName}-big-big-jar.jar

..file，包含没有.jar / classes的所有瞬态依赖项。