Question

在我的POM.xml中，我使用了maven-shade插件并重新定位了httpClient依赖项。但是当我使用mvn dependency：tree打印依赖树时，我仍然在树中看到httpClient库，如下所示。为什么会这样呢？任何帮助将不胜感激。

[INFO]    +- org.apache.httpcomponents:httpclient:jar:4.3.5:provided

我的POM.xml如下所示。

<?xml version="1.0" encoding="UTF-8"?>
<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>com.example</groupId>
  <version>1.0-SNAPSHOT</version>
 <artifactId>parser</artifactId>
  <packaging>jar</packaging>

 <!-- change these to the appropriate values -->
  <name>Parser Apps</name>
  <description>Applications to showcase different parsers</description>

  <properties>
<!-- change this if you desire to use a different version of Apex Core -->
<apex.version>3.4.0</apex.version>
    <apex.apppackage.classpath>lib/*.jar</apex.apppackage.classpath>
   <malhar.version>3.4.0</malhar.version>
 </properties>

  <build>
<plugins>
   <plugin>
     <groupId>org.apache.maven.plugins</groupId>
     <artifactId>maven-eclipse-plugin</artifactId>
     <version>2.9</version>
     <configuration>
       <downloadSources>true</downloadSources>
     </configuration>
   </plugin>
   <plugin>
     <artifactId>maven-compiler-plugin</artifactId>
     <version>3.3</version>
     <configuration>
       <encoding>UTF-8</encoding>
       <source>1.7</source>
       <target>1.7</target>
       <debug>true</debug>
       <optimize>false</optimize>
       <showDeprecation>true</showDeprecation>
       <showWarnings>true</showWarnings>
     </configuration>
   </plugin>
   <plugin>
     <artifactId>maven-dependency-plugin</artifactId>
     <version>2.8</version>
     <executions>
       <execution>
         <id>copy-dependencies</id>
         <phase>prepare-package</phase>
         <goals>
           <goal>copy-dependencies</goal>
         </goals>
         <configuration>
           <outputDirectory>target/deps</outputDirectory>
           <includeScope>runtime</includeScope>
         </configuration>
       </execution>
     </executions>
   </plugin>
  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <version>2.4.3</version>
    <executions>
      <execution>
        <phase>package</phase>
        <goals>
          <goal>shade</goal>
        </goals>
        <configuration>
          <artifactSet>
            <includes>
              <include>org.apache.httpcomponents.*</include>
            </includes>
          </artifactSet>
          <relocations>
            <relocation>
              <pattern>org.apache.httpcomponents</pattern>
              <shadedPattern>org.shaded.httpcomponents</shadedPattern>
            </relocation>
          </relocations>
        </configuration>
      </execution>
    </executions>
  </plugin>
   <plugin>
     <artifactId>maven-assembly-plugin</artifactId>
     <executions>
       <execution>
         <id>app-package-assembly</id>
         <phase>package</phase>
         <goals>
           <goal>single</goal>
         </goals>
         <configuration>
           <finalName>${project.artifactId}-${project.version}-apexapp</finalName>
           <appendAssemblyId>false</appendAssemblyId>
           <descriptors>
             <descriptor>src/assemble/appPackage.xml</descriptor>
           </descriptors>
           <archiverConfig>
             <defaultDirectoryMode>0755</defaultDirectoryMode>
           </archiverConfig>
           <archive>
             <manifestEntries>
               <Class-Path>${apex.apppackage.classpath}</Class-Path>
               <DT-Engine-Version>${apex.version}</DT-Engine-Version>
               <DT-App-Package-Group-Id>${project.groupId}</DT-App-Package-Group-Id>
               <DT-App-Package-Name>${project.artifactId}</DT-App-Package-Name>
               <DT-App-Package-Version>${project.version}</DT-App-Package-Version>
               <DT-App-Package-Display-Name>${project.name}</DT-App-Package-Display-Name>
               <DT-App-Package-Description>${project.description}</DT-App-Package-Description>
             </manifestEntries>
           </archive>
         </configuration>
       </execution>
     </executions>
   </plugin>

   <plugin>
     <artifactId>maven-antrun-plugin</artifactId>
     <version>1.7</version>
     <executions>
       <execution>
         <phase>package</phase>
         <configuration>
           <target>
             <move file="${project.build.directory}/${project.artifactId}-${project.version}-apexapp.jar"
                   tofile="${project.build.directory}/${project.artifactId}-${project.version}.apa" />
           </target>
         </configuration>
         <goals>
           <goal>run</goal>
         </goals>
       </execution>
       <execution>
         <!-- create resource directory for xml javadoc-->
         <id>createJavadocDirectory</id>
         <phase>generate-resources</phase>
         <configuration>
           <tasks>
             <delete dir="${project.build.directory}/generated-resources/xml-javadoc"/>
             <mkdir dir="${project.build.directory}/generated-resources/xml-javadoc"/>
           </tasks>
         </configuration>
         <goals>
           <goal>run</goal>
         </goals>
       </execution>
     </executions>
   </plugin>

   <plugin>
     <groupId>org.codehaus.mojo</groupId>
     <artifactId>build-helper-maven-plugin</artifactId>
     <version>1.9.1</version>
     <executions>
       <execution>
         <id>attach-artifacts</id>
         <phase>package</phase>
         <goals>
           <goal>attach-artifact</goal>
         </goals>
         <configuration>
           <artifacts>
             <artifact>
               <file>target/${project.artifactId}-${project.version}.apa</file>
               <type>apa</type>
             </artifact>
           </artifacts>
           <skipAttach>false</skipAttach>
         </configuration>
       </execution>
     </executions>
   </plugin>

  <!-- generate javdoc -->
  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-javadoc-plugin</artifactId>
    <executions>
      <!-- generate xml javadoc -->
      <execution>
        <id>xml-doclet</id>
        <phase>generate-resources</phase>
        <goals>
          <goal>javadoc</goal>
        </goals>
        <configuration>
          <doclet>com.github.markusbernhardt.xmldoclet.XmlDoclet</doclet>
          <additionalparam>-d ${project.build.directory}/generated-resources/xml-javadoc -filename ${project.artifactId}-${project.version}-javadoc.xml</additionalparam>
          <useStandardDocletOptions>false</useStandardDocletOptions>
          <docletArtifact>
            <groupId>com.github.markusbernhardt</groupId>
            <artifactId>xml-doclet</artifactId>
            <version>1.0.4</version>
          </docletArtifact>
        </configuration>
      </execution>
    </executions>
  </plugin>
  <!-- Transform xml javadoc to stripped down version containing only class/interface comments and tags-->
  <plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>xml-maven-plugin</artifactId>
    <version>1.0</version>
    <executions>
      <execution>
        <id>transform-xmljavadoc</id>
        <phase>generate-resources</phase>
        <goals>
          <goal>transform</goal>
        </goals>
      </execution>
    </executions>
    <configuration>
      <transformationSets>
        <transformationSet>
          <dir>${project.build.directory}/generated-resources/xml-javadoc</dir>
          <includes>
            <include>${pmalhar.versioroject.artifactId}-${project.version}-javadoc.xml</include>
          </includes>
          <stylesheet>XmlJavadocCommentsExtractor.xsl</stylesheet>
          <outputDir>${project.build.directory}/generated-resources/xml-javadoc</outputDir>
        </transformationSet>
      </transformationSets>
    </configuration>
  </plugin>
  <!-- copy xml javadoc to class jar -->
  <plugin>
    <artifactId>maven-resources-plugin</artifactId>
    <version>2.6</version>
    <executions>
      <execution>
        <id>copy-resources</id>
        <phase>process-resources</phase>
        <goals>
          <goal>copy-resources</goal>
        </goals>
        <configuration>
          <outputDirectory>${basedir}/target/classes</outputDirectory>
          <resources>
            <resource>
              <directory>${project.build.directory}/generated-resources/xml-javadoc</directory>
              <includes>
                <include>${project.artifactId}-${project.version}-javadoc.xml</include>
              </includes>
              <filtering>true</filtering>
            </resource>
          </resources>
        </configuration>
      </execution>
    </executions>
  </plugin>

</plugins>

 </build>

  <dependencies>
<!-- add your dependencies here -->
<dependency>
  <groupId>org.apache.apex</groupId>
  <artifactId>malhar-library</artifactId>
  <version>${malhar.version}</version>
  <!--
       If you know that your application does not need transitive dependencies pulled in by malhar-library,
       uncomment the following to reduce the size of your app package.
  -->
  <!--
  <exclusions>
    <exclusion>
      <groupId>*</groupId>
      <artifactId>*</artifactId>
    </exclusion>
  </exclusions>
  -->
</dependency>
<dependency>
  <groupId>org.apache.apex</groupId>
  <artifactId>malhar-contrib</artifactId>
  <version>${malhar.version}</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.5.4</version>
</dependency>
<dependency>
  <groupId>com.github.fge</groupId>
  <artifactId>json-schema-validator</artifactId>
  <version>2.0.1</version>
  <optional>true</optional>
</dependency>
<dependency>
  <groupId>net.sf.supercsv</groupId>
  <artifactId>super-csv</artifactId>
  <version>2.4.0</version>
  <optional>true</optional>
</dependency>
<dependency>
  <groupId>org.apache.apex</groupId>
  <artifactId>apex-common</artifactId>
  <version>${apex.version}</version>
  <scope>provided</scope>
</dependency>
<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.10</version>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.apache.apex</groupId>
  <artifactId>apex-engine</artifactId>
  <version>${apex.version}</version>
  <scope>provided</scope>
</dependency>

Answer 1

两件事 -

你应该知道重定位没有做什么＆＃34; ...重新定位httpClient依赖＆＃34;但正如source所暗示的那样 -

如果uber JAR被重用作某些其他项目的依赖项，直接包含来自工件的依赖关系中的类由于重复的类，uber JAR可能导致类加载冲突班级路径。要解决此问题，可以重新定位类它包含在阴影工件中以创建私有他们的字节码的副本
执行mvn dependency:tree时，它会显示项目中包含的所有依赖项（直接和传递）。相反，maven shade插件

shade：shade绑定到包阶段并用于创建a 阴影罐。

进一步重命名或优化依赖关系。以下是Maven Shade Plugin -

此插件提供了将工件打包的功能 uber-jar，包括它的依赖关系和阴影 - 即重命名 - 一些依赖项的包。

Answer 2

不会从原始POM中删除依赖项，因此dependency:tree的行为是正确的。

Shade插件还会生成一个新的POM（dependency-reduced-pom.xml），其中从<dependencies>部分删除着色的依赖项。这看起来就像你追求的那个。

Maven shade插件重定位并捆绑不起作用

2 个答案: