java - 运行maven jar文件时出错

Question

我从 eclipse 创建了 maven jar 文件。运行 jar 时出现以下错误。

错误:

 A JNI error has occurred, please check your installation and try again

    Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/fs/FSDataOutputStream
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Unknown Source) 
    at java.lang.Class.privateGetMethodRecursive(Unknown Source)

请指导pom.xml中是否需要添加依赖

pom.xml

<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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>utd.bigdata</groupId>
  <artifactId>hadoop1</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>hw1</name>
  <dependencies>
  <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-client</artifactId>
        <version>2.4.1</version>
  </dependency>
   <dependency>
     <groupId>org.apache.hadoop</groupId>
      <artifactId>hadoop-common</artifactId>
      <version>2.7.3</version>
        <scope>compile</scope>
       </dependency>
  <!--  <dependency>
    <groupId>org.apache.hadoop</groupId>
    <artifactId>hadoop-auth</artifactId>
    <version>2.4.1</version>
</dependency>-->
  </dependencies>
  <build>
    <plugins>
        <plugin>
            <!-- Build an executable JAR -->
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <version>2.4</version>
            <configuration>
                <archive>
                    <manifest>
                        <mainClass>bigdata.UploadHadoop</mainClass>
                        <classpathPrefix>classes/lib</classpathPrefix>
                    </manifest>
                </archive>
            </configuration>
        </plugin>
    </plugins>
</build>
</project>

pom.xml 中是否有任何错误？请建议任何代码更改

Answer 1

常规 .jar 存档在运行时不包含其依赖项，为此您可以使用 maven-assembly-plugin 创建一个胖可执行 Jar:

https://maven.apache.org/plugins/maven-assembly-plugin/usage.html

<!-- Create a fat Jar -->
<plugin>
  <artifactId>maven-assembly-plugin</artifactId>
  <executions>
    <execution>
      <phase>package</phase>
      <goals>
        <goal>single</goal>
      </goals>
    </execution>
  </executions>
  <configuration>
    <archive>
      <manifest>
        <mainClass>bigdata.UploadHadoop</mainClass>
      </manifest>
    </archive>
    <descriptorRefs>
      <descriptorRef>jar-with-dependencies</descriptorRef>
    </descriptorRefs>
  </configuration>
</plugin>