Question

HI，

我正在尝试使用maven创建可执行jar。 jar被创建，当我尝试执行java -jar myjar时，我收到以下错误

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

我提取了jar，看到hadoop类不存在。在日志中我可以看到没有复制hadoop jar。问题在哪里

我的pom.xml如下：

＆LT;建立＆GT;

＆LT;插件＆GT;

＆LT;插件＆GT;

＆LT;＆的groupId GT; org.apache.maven.plugins＆LT; /＆的groupId GT;
            ＆LT; artifactId的＆GT;行家编译-插件＆LT; / artifactId的＆GT;
             ＆LT;版本＆GT; 2.3.1＆LT; /版本＆GT;
        ＆lt;结构＆GT;
          ＆lt;信源＆GT; 1.6＆LT; /源＆GT;
          ＆lt;目标＆GT; 1.6＆LT; /靶GT;
        ＆LT; /结构＆gt;
      ＆LT; /插件＆GT;
    ＆LT;插件＆GT;
      ＆LT;＆的groupId GT; org.apache.maven.plugins＆LT; /＆的groupId GT;
      ＆LT; artifactId的＆GT;行家组装-插件＆LT; / artifactId的＆GT;
      ＆LT;版本＆GT; 2.2-β-4; /版本＆GT;
      ＆lt;结构＆GT;
        ＆LT; descriptorRefs＆GT;
          ＆LT; descriptorRef＆GT;罐子与 - 依赖性＆LT; / descriptorRef＆GT;
        ＆LT; / descriptorRefs＆GT;
        ＆LT;档案＆GT;
          ＆LT;清单＆GT;
            ＆LT; mainClass＆GT; com.MyClass＆LT; / mainClass＆GT;
          ＆LT; /清单＆GT;
        ＆LT; /存档＆GT;
      ＆LT; /结构＆gt;
      ＆LT;处决＆GT;         ＆LT;执行＆GT;
          ＆LT;阶段＆gt;＆包LT; /阶段＆gt;
          ＆LT;目标＆GT;
            ＆LT;目标＆GT;单＆LT; /目标＆GT;
          ＆LT; /目标＆GT;
        ＆LT; /执行＆GT;
      ＆LT; /处决＆GT;
       ＆LT; /插件＆GT;
     ＆LT; /插件＆GT;
     ＆LT; /构建＆GT;

    <!-- 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

您已将hadoop jar指定为范围为<scope>provided</scope>的依赖项这意味着它们将在运行时位于类路径上，如果您希望它们包含在jar中，则删除范围标记并接受编译的默认范围。

请参阅http://maven.apache.org/pom.html

通过maven创建jar的问题

1 个答案: