將maven-build-classpath添加到插件執行類路徑

Question

我正在寫一些coge-gen maven-plugin。

我需要將我的項目classpath注入到我的插件執行類路徑中。我發現這article。那裏的解決方案很有效，但時間很長。也許你們有人知道一個開箱即用的解決方案。

Answer 1

找到了answer！

好的，帕斯卡是對的，這裏是基礎！

所以這裏是最乾淨的方式（據我所知）將編譯類路徑添加到您的插件的執行。

下面是我的code-gen插件的一些代碼示例，它實際上是基於編譯的代碼生成一些模板代碼。所以我首先需要編譯代碼，然後進行分析，生成一些代碼，然後再次編譯。

1. 使用@configurator在魔類：

   /** 
   * @goal generate 
   * @phase process-classes 
   * @configurator include-project-dependencies 
   * @requiresDependencyResolution compile+runtime 
   */ 
   public class CodeGenMojo 
        extends AbstractMojo 
   { 
       public void execute() 
         throws MojoExecutionException 
       { 
        // do work.... 
       } 
   } 
   

   請注意在Javadoc頭的@configurator線，它是essetial爲叢IOC容器不只是一個註釋行。

2. 執行include-project-dependencies配置程序。我從Brian Jackson那裏拿到了這個非常好的課程，並將它添加到你的插件的源代碼中。

   /** 
   * A custom ComponentConfigurator which adds the project's runtime classpath elements 
   * to the 
   * 
   * @author Brian Jackson 
   * @since Aug 1, 2008 3:04:17 PM 
   * 
   * @plexus.component role="org.codehaus.plexus.component.configurator.ComponentConfigurator" 
   *     role-hint="include-project-dependencies" 
   * @plexus.requirement role="org.codehaus.plexus.component.configurator.converters.lookup.ConverterLookup" 
   *     role-hint="default" 
   */ 
   public class IncludeProjectDependenciesComponentConfigurator extends AbstractComponentConfigurator { 
   
       private static final Logger LOGGER = Logger.getLogger(IncludeProjectDependenciesComponentConfigurator.class); 
   
       public void configureComponent(Object component, PlexusConfiguration configuration, 
               ExpressionEvaluator expressionEvaluator, ClassRealm containerRealm, 
               ConfigurationListener listener) 
        throws ComponentConfigurationException { 
   
        addProjectDependenciesToClassRealm(expressionEvaluator, containerRealm); 
   
        converterLookup.registerConverter(new ClassRealmConverter(containerRealm)); 
   
        ObjectWithFieldsConverter converter = new ObjectWithFieldsConverter(); 
   
        converter.processConfiguration(converterLookup, component, containerRealm.getClassLoader(), configuration, 
                expressionEvaluator, listener); 
       } 
   
       private void addProjectDependenciesToClassRealm(ExpressionEvaluator expressionEvaluator, ClassRealm containerRealm) throws ComponentConfigurationException { 
        List<String> runtimeClasspathElements; 
        try { 
         //noinspection unchecked 
         runtimeClasspathElements = (List<String>) expressionEvaluator.evaluate("${project.runtimeClasspathElements}"); 
        } catch (ExpressionEvaluationException e) { 
         throw new ComponentConfigurationException("There was a problem evaluating: ${project.runtimeClasspathElements}", e); 
        } 
   
        // Add the project dependencies to the ClassRealm 
        final URL[] urls = buildURLs(runtimeClasspathElements); 
        for (URL url : urls) { 
         containerRealm.addConstituent(url); 
        } 
       } 
   
       private URL[] buildURLs(List<String> runtimeClasspathElements) throws ComponentConfigurationException { 
        // Add the projects classes and dependencies 
        List<URL> urls = new ArrayList<URL>(runtimeClasspathElements.size()); 
        for (String element : runtimeClasspathElements) { 
         try { 
          final URL url = new File(element).toURI().toURL(); 
          urls.add(url); 
          if (LOGGER.isDebugEnabled()) { 
           LOGGER.debug("Added to project class loader: " + url); 
          } 
         } catch (MalformedURLException e) { 
          throw new ComponentConfigurationException("Unable to access project dependency: " + element, e); 
         } 
        } 
   
        // Add the plugin's dependencies (so Trove stuff works if Trove isn't on 
        return urls.toArray(new URL[urls.size()]); 
       } 
   
   } 
   

3. 這是我的插件的構建部分，你將不得不添加。

   <modelVersion>4.0.0</modelVersion> 
   <groupId>com.delver</groupId> 
   <artifactId>reference-gen-plugin</artifactId> 
   <name>Reference Code Genration Maven Plugin</name> 
   
   <packaging>maven-plugin</packaging> 
   <version>1.2</version> 
   
   <url>http://maven.apache.org</url> 
   
   <properties> 
       <maven.version>2.2.1</maven.version> 
   </properties> 
   
   <build> 
       <plugins> 
        <plugin> 
         <groupId>org.codehaus.plexus</groupId> 
         <artifactId>plexus-maven-plugin</artifactId> 
         <executions> 
          <execution> 
           <goals> 
            <goal>descriptor</goal> 
           </goals> 
          </execution> 
         </executions> 
        </plugin> 
       </plugins> 
   </build> 
   <dependencies> 
   
       <dependency> 
        <groupId>org.apache.maven</groupId> 
        <artifactId>maven-artifact</artifactId> 
        <version>${maven.version}</version> 
       </dependency> 
       <dependency> 
        <groupId>org.apache.maven</groupId> 
        <artifactId>maven-plugin-api</artifactId> 
        <version>${maven.version}</version> 
       </dependency> 
       <dependency> 
        <groupId>org.apache.maven</groupId> 
        <artifactId>maven-project</artifactId> 
        <version>${maven.version}</version> 
       </dependency> 
       <dependency> 
        <groupId>org.apache.maven</groupId> 
        <artifactId>maven-model</artifactId> 
        <version>${maven.version}</version> 
       </dependency> 
       <dependency> 
        <groupId>org.apache.maven</groupId> 
        <artifactId>maven-core</artifactId> 
        <version>2.0.9</version> 
       </dependency> 
   
   </dependencies> 
   

   這裏是插件的這些誰需要它的pom.xml。現在應該編譯沒有問題。 （有毛病的頭，所以忽略它）

Answer 2

遵循此鏈接....做了非常類似的事情，我的代碼...我創建我有完全使用Maven的裝修插件 相同的pom.xml爲我的插件，重新使用IncludeProjectDependenciesComponentConfigurator

我使用maven 2.2。0 如果它可以幫助，這裏的POM再次

<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/maven-v4_0_0.xsd"> 

<modelVersion>4.0.0</modelVersion> 
<groupId>com.worldcorpservices.plugins</groupId> 
<artifactId>maven-fit-plugin</artifactId> 
<packaging>maven-plugin</packaging> 
<version>1.0-SNAPSHOT</version> 
<name>maven-fit-plugin Maven Mojo</name> 
<url>http://maven.apache.org</url> 

<properties> 
    <fitlibrary.version>2.0</fitlibrary.version> 
    <maven.version>2.2.0</maven.version> 
</properties> 


<dependencies> 
    <dependency> 
     <groupId>org.apache.maven</groupId> 
     <artifactId>maven-plugin-api</artifactId> 
     <version>2.0</version> 
    </dependency> 
    <dependency> 
     <groupId>junit</groupId> 
     <artifactId>junit</artifactId> 
     <version>4.7</version> 
     <scope>test</scope> 
    </dependency> 
    <dependency> 
     <groupId>commons-logging</groupId> 
     <artifactId>commons-logging</artifactId> 
     <version>1.1.1</version> 
    </dependency> 

    <dependency> 
     <groupId>org.fitnesse</groupId> 
     <artifactId>fitlibrary</artifactId> 
     <version>${fitlibrary.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>log4j</groupId> 
     <artifactId>log4j</artifactId> 
     <version>1.2.12</version> 
    </dependency> 
    <dependency> 
     <groupId>poi</groupId> 
     <artifactId>poi</artifactId> 
     <version>3.7-20101029</version> 
    </dependency> 

    <dependency> 
     <groupId>org.apache.maven</groupId> 
     <artifactId>maven-artifact</artifactId> 
     <version>${maven.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.apache.maven</groupId> 
     <artifactId>maven-plugin-api</artifactId> 
     <version>${maven.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.apache.maven</groupId> 
     <artifactId>maven-project</artifactId> 
     <version>${maven.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.apache.maven</groupId> 
     <artifactId>maven-model</artifactId> 
     <version>${maven.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.apache.maven</groupId> 
     <artifactId>maven-core</artifactId> 
     <version>2.0.9</version> 
    </dependency> 


</dependencies> 
<build> 

希望這有助於

RGDS 馬爾科

<plugins> 
     <plugin> 
      <artifactId>maven-compiler-plugin</artifactId> 
      <configuration> 
       <source>1.6</source> 
       <target>1.6</target> 
      </configuration> 
     </plugin> 
     <plugin> 
      <groupId>org.codehaus.plexus</groupId> 
      <artifactId>plexus-maven-plugin</artifactId> 
      <executions> 
       <execution> 
        <goals> 
         <goal>descriptor</goal> 
        </goals> 
       </execution> 
      </executions> 
     </plugin> 


    </plugins> 

</build> 

Answer 3

我採取這種做法，顯然它的工作：

1 - MavenProject參數是nee DED你的Mojo類中：

@Parameter(defaultValue = "${project}", required = true, readonly = true) 
private MavenProject project; 

2 - 然後你可以從工程實例的路徑元素：

try { 
    Set<URL> urls = new HashSet<>(); 
    List<String> elements = project.getTestClasspathElements(); 
            //getRuntimeClasspathElements() 
            //getCompileClasspathElements() 
            //getSystemClasspathElements() 
    for (String element : elements) { 
     urls.add(new File(element).toURI().toURL()); 
    } 

    ClassLoader contextClassLoader = URLClassLoader.newInstance(
      urls.toArray(new URL[0]), 
      Thread.currentThread().getContextClassLoader()); 

    Thread.currentThread().setContextClassLoader(contextClassLoader); 

} catch (DependencyResolutionRequiredException e) { 
    throw new RuntimeException(e); 
} catch (MalformedURLException e) { 
    throw new RuntimeException(e); 
}