Maven shade插件重定位並捆綁不起作用

Question

在我的POM.xml中，我使用了maven-shade插件並重新定位了httpClient依賴項。 但是當我使用mvn dependency：tree打印依賴樹時，我仍然在樹中看到httpClient庫，如下所示。 為什么會這樣呢？ 任何幫助將不勝感激。

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

我的POM.xml如下。

<?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

兩件事情 -

1. 您應該知道重定位不是“...重定位httpClient依賴”，但正如消息來源所暗示的那樣 -

   如果將uber JAR重用為某個其他項目的依賴項，則直接在uber JAR中包含工件的依賴項中的類可能會因類路徑上的重復類而導致類加載沖突。 要解決此問題，可以重新定位包含在着色工件中的類，以便創建其字節碼的私有副本

2. 當您執行mvn dependency:tree ，它將顯示項目中包含的所有依賴項（直接和傳遞）。 相反，maven shade插件

陰影：陰影與包裝相結合，用於制作陰影罐。

進一步重命名或優化依賴項。 以下是Maven Shade插件的詳細信息 -

這個插件提供了將工件打包在超級jar中的功能，包括它的依賴關系和陰影 - 即重命名 - 一些依賴項的包。

Answer 2

不會從原始POM中刪除依賴項，因此dependency:tree的行為是正確的。

Shade插件還將生成一個新的POM（ dependency-reduced-pom.xml ），其中從<dependencies>部分刪除着色的依賴項。 這看起來就像你追求的那個。