为什么在运行maven阶段时未执行关联的目标

下面是我的maven插件maven依赖插件和与phase包相关的目标 我认为如果我运行命令mvn包，应该执行目标（dependecy:copy dependencies），因为这个目标与阶段包关联，但它不运行。谁能给我一些提示吗

<plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>2.8</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

org.apache.maven.plugins
maven依赖插件
2.8
包裹
复制依赖项

#

http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4.0.0

<groupId>com.test</groupId>
<artifactId>abc</artifactId>
<version>1.0-SNAPSHOT</version>

<name>abc</name>
<url>http://www.example.com</url>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
</properties>

<dependencies>
    <!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka -->
    <dependency>
        <groupId>org.apache.kafka</groupId>
        <artifactId>kafka_2.11</artifactId>
        <version>1.0.1</version>
    </dependency>

    <dependency>
        <groupId>org.apache.kafka</groupId>
        <artifactId>kafka-streams</artifactId>
        <version>1.0.1</version>
    </dependency>

    <!--dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.25</version>
    </dependency>

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.25</version>
    </dependency-->

    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
        <scope>test</scope>
    </dependency>
</dependencies>

<build>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
        <plugins>
            <plugin>
                <!-- mvn clean compile assembly:single -->
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>de.dbschenker.rail.sresb.messages.util.KafkaStreamsApp</mainClass>
                        </manifest>
                    </archive>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-clean-plugin</artifactId>
                <version>3.0.0</version>
            </plugin>
            <!-- see http://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>3.7.0</version>
            </plugin>
            <plugin>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.20.1</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>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>2.8</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </pluginManagement>
</build>

com.test
abc
1.0-快照
abc
http://www.example.com
UTF-8
1.8
1.8
org.apache.kafka
卡夫卡2.11
1.0.1
org.apache.kafka
卡夫卡河
1.0.1
朱尼特
朱尼特
4.11
测试
maven汇编插件
de.dbschenker.rail.sresb.messages.util.KafkaStreamsApp
带有依赖项的jar
maven清洁插件
3.0.0
maven资源插件
3.0.2
maven编译器插件
3.7.0
maven surefire插件
2.20.1
maven jar插件
3.0.2
maven安装插件
2.5.2
maven部署插件
2.8.2
org.apache.maven.plugins
maven依赖插件
2.8
包裹
复制依赖项

---

问题仅仅是因为您在pluginManagement区域中找到了maven依赖插件，而该插件不会真正执行插件

应该是这样的：

<project>
  [...]
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <version>3.1.1</version>
        <executions>
          <execution>
            <id>copy-dependencies</id>
            <phase>package</phase>
            <goals>
              <goal>copy-dependencies</goal>
            </goals>
            <configuration>
              <!-- configure the plugin here -->
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
  [...]
</project>

[...]
org.apache.maven.plugins
maven依赖插件
3.1.1
复制依赖项
包裹
复制依赖项
[...]

pluginManagement区域旨在定义版本和配置，而不是执行本身

---

除此之外，我不认为您需要此配置，因为您已经在使用maven assembly插件。

第一个问题：为什么需要此配置？我需要将所有依赖项JAR复制到一个单独的目录这是我根据给定的配置所理解的。但我想知道您为什么要这样做？什么类型f你想解决的问题？你能给出项目或者至少完整的pom文件吗？我还有第二个@khmarbaise问题。请详细说明。我使用maven dependency plugin的原因，因为我需要将所有dependency JAR复制到单独的文件夹中作为lib目录，以及我已经在这里提供的整个pom文件。maven-assembly-plugin package all依赖库，工件作为一个jar。但是依赖插件可以将所有依赖库复制到单独的文件夹中。

<project>
  [...]
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <version>3.1.1</version>
        <executions>
          <execution>
            <id>copy-dependencies</id>
            <phase>package</phase>
            <goals>
              <goal>copy-dependencies</goal>
            </goals>
            <configuration>
              <!-- configure the plugin here -->
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
  [...]
</project>