不同之处: maven汇编:汇编还是汇编:单一目标？

Question

我正在尝试使用一些注释驱动的依赖注入(dagger 2)代码来构建alexa-app。alexa-sample-skills-test给出了示例pom，并指示使用以下命令构建一个带有依赖项的jar。

mvn assembly:assembly -DdescriptorId=jar-with-dependencies package

使用上面的代码构建失败，并显示此link中列出的异常和输出。在对maven docs进行了一些研究之后，我发现assembly:assembly目标使用了非标准的构建过程，这可能会破坏havocs。相反，maven assembly-plugin文档建议使用assembly:single goal。因此，我改用以下命令：

mvn assembly:single -DdescriptorId=jar-with-dependencies package

瞧..。代码编译和链接进行得很好。我得到一个project-name-jar-with-dependencies.jar文件。但是，当我将jar上传到amazon服务器并尝试测试该技能时，测试失败。日志显示找不到类: echo.client.AccountInfoStreamHandler (ClassNotFoundException)。我想，这个类恰好发生在根启动器类中。

现在，我用最简单的代码库重复所有dagger 2依赖项。第一个maven命令(assembly:assembly)起作用。第二个maven命令(assembly:single)失败，并显示相同的“ClassNotFoundException”错误。我做错了什么？我不太熟悉maven，这真的是我第一次尝试解决maven命令的问题。任何建议，指针，建议都是非常感谢的。

作为参考，POM文件如下：

<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.apil.echo.accountant</groupId>
  <artifactId>echo-device-client</artifactId>
  <packaging>jar</packaging>
  <version>1.0</version>
  <name>Echo Device Client</name>

  <repositories>
    <repository>
      <id>alexa-skills-kit-repo</id>
      <url>file://${project.basedir}/repo</url>
    </repository>
    <repository>
      <id>Maven Central</id>
      <url>http://repo1.maven.org/maven2/</url>
    </repository>
  </repositories>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.powermock</groupId>
      <artifactId>powermock-module-junit4</artifactId>
      <version>1.6.4</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.powermock</groupId>
      <artifactId>powermock-api-mockito</artifactId>
      <version>1.6.4</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.5.3</version>
    </dependency>

    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.5.3</version>
    </dependency>

    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.5.3</version>
    </dependency>

    <dependency>
      <groupId>com.plaid</groupId>
      <artifactId>plaid-java</artifactId>
      <version>0.2.12</version>
    </dependency>
    <dependency>
      <groupId>alexa-skills-kit</groupId>
      <artifactId>alexa-skills-kit</artifactId>
      <version>1.1</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.eclipse.jetty</groupId>
      <artifactId>jetty-server</artifactId>
      <version>9.0.6.v20130930</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.eclipse.jetty</groupId>
      <artifactId>jetty-servlet</artifactId>
      <version>9.0.6.v20130930</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.10</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-lang3</artifactId>
      <version>3.3.2</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.apache.directory.studio</groupId>
      <artifactId>org.apache.commons.io</artifactId>
      <version>2.4</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>com.amazonaws</groupId>
      <artifactId>aws-lambda-java-core</artifactId>
      <version>1.0.0</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>com.amazonaws</groupId>
      <artifactId>aws-java-sdk-dynamodb</artifactId>
      <version>1.9.40</version>
    </dependency>

    <!-- using mockito for test -->
    <dependency>
      <groupId>org.mockito</groupId>
      <artifactId>mockito-all</artifactId>
      <version>1.9.5</version>
      <scope>test</scope>
    </dependency>

      <dependency>
          <groupId>com.google.dagger</groupId>
          <artifactId>dagger</artifactId>
          <version>2.0</version>
      </dependency>
      <dependency>
          <groupId>com.google.dagger</groupId>
          <artifactId>dagger-compiler</artifactId>
          <version>2.0</version>
          <optional>true</optional>
      </dependency>

  </dependencies>

  <properties>
    <property name="disableRequestSignatureCheck" value="false"/>
    <property name="supportedApplicationIds" value=""/>
    <property name="timestampTolerance" value="150"/>
  </properties>

  <build>
    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.3</version>
          <configuration>
            <source>1.7</source>
            <target>1.7</target>
          </configuration>
        </plugin>

        <plugin>
          <groupId>org.codehaus.mojo</groupId>
          <artifactId>exec-maven-plugin</artifactId>
          <version>1.2.1</version>
          <configuration>
            <mainClass>Launcher</mainClass>
            <systemProperties>
              <systemProperty>
                <key>javax.net.ssl.keyStore</key>
                <value>/insert/your/path/java-keystore.jks</value>
              </systemProperty>
              <systemProperty>
                <key>javax.net.ssl.keyStorePassword</key>
                <value>insert_your_password</value>
              </systemProperty>
              <systemProperty>
                <key>com.amazon.speech.speechlet.servlet.disableRequestSignatureCheck</key>
                <value>${disableRequestSignatureCheck}</value>
              </systemProperty>
              <systemProperty>
                <key>com.amazon.speech.speechlet.servlet.supportedApplicationIds</key>
                <value>${supportedApplicationIds}</value>
              </systemProperty>
              <systemProperty>
                <key>com.amazon.speech.speechlet.servlet.timestampTolerance</key>
                <value>${timestampTolerance}</value>
              </systemProperty>
            </systemProperties>
          </configuration>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

Answer 1

我最终使用的gradle构建脚本是最近为alexa-sample-skills-test提供的。初步的构建检查显示所需的类: echo.client.Class..在生成的构建中确实存在。

检查上面的maven命令产生的uber-jar，我注意到

mvn assembly:assembly ...

导致了一个jar，该jar包含缺少类的echo.client包。然而，

mvn assembly:single...

导致jar没有echo.client包，也没有包中定义的任何应用程序类。因此，我得到了ClassNotFoundException。我还是没弄明白为什么会发生这种事。然而，我认为从现在开始切换到'gradle‘的时机已经成熟……