通過maven創建jar問題

Question

嗨，

我正在嘗試使用maven創建可執行jar。創建罐子，當我嘗試執行Java的罐子myjar這一我得到以下錯誤

引起的：在java.net.URLClassLoader的org.apache.hadoop.conf.Configuration ：拋出java.lang.ClassNotFoundException $ 1.run（URLClassLoader.java:202）

我提取了jar，看到hadoop類不存在。並在日誌中我可以看到Hadoop的罐子不會被複制。哪裏出了問題

我的pom.xml如下：

<構建>

<插件>

<插件>

<groupId> org.apache.maven.plugins < /的groupId >
<的artifactId >行家編譯-插件</artifactId的>
<版本2.3.1 > < /版本>
<配置>
<源> 1.6 </source >
<target> 1.6 </tar得到>
< /配置>
< /插件>
<插件>
<的groupId > org.apache.maven.plugins < /的groupId >
<的artifactId >行家組裝-插件</artifactId的>
<版本> 2。2-β-4 < /版本>
<配置>
<descriptorRefs>
<descriptorRef>罐與 - 依賴性</descriptorRef >
</descriptorRefs >
<歸檔>
<清單>
<mainClass> com.MyClass </mainClass >
< /清單>
< /存檔>
< /配置>
<處決> <執行>
<相>包< /相位>
個<目標>
<目標>單< /目標>
< /兩球>
< /執行>
< /執行>
< /插件>
< /插件>
< /建>

<!-- Compile time dependencies --> 
<dependency> 
    <groupId>bixo</groupId> 
<artifactId>bixo-core</artifactId> 
    <version>1.0-SNAPSHOT</version> 
</dependency> 
    <dependency> 
     <groupId>cascading</groupId> 
     <artifactId>cascading-core</artifactId> 
    </dependency> 

    <dependency> 
     <groupId>cascading</groupId> 
     <artifactId>cascading-11-jdbc</artifactId> 
     <version>0.0.4</version> 
    </dependency> 

    <dependency> 
     <groupId>hsqldb</groupId> 
     <artifactId>hsqldb</artifactId> 
     <version>1.8.0.7</version> 
    </dependency> 

    <dependency> 
     <groupId>org.apache.httpcomponents</groupId> 
     <artifactId>httpcore</artifactId> 
     <version>4.0.1</version> 
    </dependency> 

<dependency> 
     <groupId>org.apache.lucene</groupId> 
     <artifactId>lucene-core</artifactId> 
    </dependency> 

    <dependency> 
     <groupId>org.apache.tika</groupId> 
     <artifactId>tika-parsers</artifactId> 
     <version>0.8</version> 
    </dependency> 

    <dependency> 
     <groupId>org.archive</groupId> 
     <artifactId>heritrix</artifactId> 
     <version>1.14.3</version> 
    </dependency> 

    <dependency> 
     <groupId>log4j</groupId> 
     <artifactId>log4j</artifactId> 
     <version>1.2.14</version> 
    </dependency> 

    <dependency> 
     <groupId>commons-lang</groupId> 
     <artifactId>commons-lang</artifactId> 
     <version>2.4</version> 
    </dependency> 

    <dependency> 
     <groupId>commons-io</groupId> 
     <artifactId>commons-io</artifactId> 
     <version>1.4</version> 
    </dependency> 

    <dependency> 
     <groupId>org.kohsuke</groupId> 
     <artifactId>args4j</artifactId> 
     <version>2.0.10</version> 
    </dependency> 


    <dependency> 
     <groupId>org.apache.hadoop</groupId> 
     <artifactId>hadoop-core</artifactId> 
     <version>0.21.0-SNAPSHOT</version> 
     <scope>provided</scope> 
     <exclusions> 
      <exclusion> 
       <artifactId>jetty</artifactId> 
       <groupId>org.mortbay.jetty</groupId> 
      </exclusion> 
      <exclusion> 
       <artifactId>jetty-util</artifactId> 
       <groupId>org.mortbay.jetty</groupId> 
      </exclusion> 
     </exclusions> 
    </dependency> 
    <dependency> 
      <groupId>org.apache.hadoop</groupId> 
      <artifactId>hadoop-mapred</artifactId> 
      <version>0.21.0-SNAPSHOT</version> 
      <scope>provided</scope> 
</dependency> 
<dependency> 
      <groupId>org.apache.hadoop</groupId> 
      <artifactId>hadoop-common</artifactId> 
      <version>0.21.0-SNAPSHOT</version> 
      <scope>provided</scope> 
</dependency> 
    <dependency> 
     <groupId>javax.servlet</groupId> 
     <artifactId>servlet-api</artifactId> 
     <version>2.5</version> 
     <scope>provided</scope> 
    </dependency> 

    <!-- Eclipse project generation dependencies --> 

    <dependency> 
     <groupId>ant-eclipse</groupId> 
     <artifactId>ant-eclipse-jvm1.2</artifactId> 
     <version>1.0</version> 
     <scope>eclipse</scope> 
    </dependency> 

</dependencies> 

<dependencyManagement> 
    <dependencies> 
     <dependency> 
      <groupId>org.apache.lucene</groupId> 
      <artifactId>lucene-core</artifactId> 
      <version>2.4.1</version> 
     </dependency> 

     <dependency> 
      <groupId>cascading</groupId> 
      <artifactId>cascading-core</artifactId> 
      <version>1.1.1</version> 
     </dependency> 

     <dependency> 
      <groupId>cascading</groupId> 
      <artifactId>cascading-test</artifactId> 
      <version>1.1.1</version> 
     </dependency> 
    </dependencies> 
</dependencyManagement> 
` 

Answer 1

您指定的Hadoop的罐子作爲具有<scope>provided</scope>一個範圍的依賴性。
這意味着它們將在運行時位於類路徑上，如果你希望它們被包含在你的jar中，那麼刪除scope標籤並接受的默認範圍編譯。

請參閱http://maven.apache.org/pom.html