使用maven shade插件的父pom和子pom布局

Question

我正试着做一个包含所有项目的胖uber罐子。如果我做了“MVN包”，我得到一个uber jar下的“blah”项目标签文件夹。（blah项目有主类。）uber jar包含所有项目（作为文件夹而不是jar)，但当我运行它时，它似乎无法识别feature1和feature2项目。

<plugins>

  <!-- download source code in Eclipse, best practice -->
  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-eclipse-plugin</artifactId>
    <version>2.10</version>
    <configuration>
      <downloadSources>true</downloadSources>
      <downloadJavadocs>false</downloadJavadocs>
    </configuration>
  </plugin>

  <!-- Set a compiler level -->
  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.6.1</version>
    <configuration>
      <source>1.8</source>
      <target>1.8</target>
    </configuration>
  </plugin>

  <!-- Maven Shade Plugin -->
  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <version>3.1.1</version>
    <executions>
      <!-- Run shade goal on package phase -->
      <execution>
        <phase>package</phase>
        <goals>
          <goal>shade</goal>
        </goals>
        <configuration>
          <transformers>
            <!-- add Main-Class to manifest file -->
            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
              <mainClass>com.a.blah.main</mainClass>
            </transformer>
          </transformers>
          <filters>
            <filter>
              <artifact>*:*</artifact>
              <excludes>
                <exclude>META-INF/*.SF</exclude>
                <exclude>META-INF/*.DSA</exclude>
                <exclude>META-INF/*.RSA</exclude>
              </excludes>
            </filter>
          </filters>
        </configuration>
      </execution>
    </executions>
  </plugin>

</plugins>
<modules>
  <module>blahtask</module>
  <module>feature1</module>
  <module>feature2</module>
  <module>blahmessaging</module>
  <module>blah</module>
</modules>

<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.39</version>
  <scope>runtime</scope>
</dependency>
<dependency>
  <groupId>com.a.blah</groupId>
  <artifactId>blahtask</artifactId>
  <version>1.0-SNAPSHOT</version>
  <scope>compile</scope>
</dependency>
<dependency>
  <groupId>com.a.blah</groupId>
  <artifactId>blahmessaging</artifactId>
  <version>1.0-SNAPSHOT</version>
  <scope>compile</scope>
</dependency>
<dependency>
  <groupId>com.a.fs</groupId>
  <artifactId>feature1</artifactId>
  <version>1.0-SNAPSHOT</version>
  <scope>compile</scope>
</dependency>
<dependency>
  <groupId>com.a.fs</groupId>
  <artifactId>feature2</artifactId>
  <version>1.0-SNAPSHOT</version>
  <scope>compile</scope>
</dependency>

我在上面添加了feature1和feature2的依赖项，以便它们在uber jar文件中。这错了吗？附注。blahmessaging、feature1、&feature2使用BlahTask中的类/函数。

很难找到包含多个项目的maven-shade-plugin示例。很难找到他们的poms文件应该是怎样的，父子关系应该是怎样的结构。

Answer 1

原来是服务加载程序的问题...我手动添加了feature1和feature2项目中用于serviceloader的类名。

如果您正在使用serviceloader，下面是我所做的。

feature1/src/main/resources/meta-inf/services/“某些超级类”feature2/src/main/resources/meta-inf/services/“某些超级类”

如果使用文本编辑器打开这两个，则ServiceLoader需要的每一个都有一个子类名。我将它们复制并添加到JAR中的“某些超类”文件中。