hadoop程序引入第三方依赖包fastjson，打包MapReduce程序，到集群上执行，或者在IDEA直接提交到YARN都报Error: java.lang.ClassNotFoundException: com.alibaba.fastjson.JSON...这个错误
通过maven-assembly-plugin自定义打包解决此问题
首先在pom.xml文件中添加插件声明：
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<descriptors>
<descriptor>src/assembly/assembly.xml</descriptor>
</descriptors>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.wxx.bigdata.mr.ETLApp</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
其次自定义assembly.xml文件
<assembly
xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0
http://maven.apache.org/xsd/assembly-1.1.0.xsd">
<id>customer-dependencies</id>
<formats>
<format>jar</format>
</formats>
<!-- 指定是否包含打包层目录,此处设置为false，否则会找不到main class -->
<includeBaseDirectory>false</includeBaseDirectory>
<fileSets>
<fileSet>
<directory>${project.build.directory}/classes</directory>
<outputDirectory>/</outputDirectory>
</fileSet>
</fileSets>
<dependencySets>
<dependencySet>
<unpack>true</unpack>
<includes>
<include>com.alibaba:fastjson</include>
</includes>
</dependencySet>
</dependencySets>
</assembly>
项目的目录结构如图
完整的pom.xml文件如下：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.wxx.bigdata</groupId>
<artifactId>hadoop-project</artifactId>
<version>1.0</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<hadoop.version>2.6.0-cdh5.15.1</hadoop.version>
<zk.version>3.4.5-cdh5.15.1</zk.version>
<curator.version>4.0.0</curator.version>
<flume.version>1.6.0-cdh5.15.1</flume.version>
</properties>
<repositories>
<repository>
<id>cloudera</id>
<url>https://repository.cloudera.com/artifactory/cloudera-repos</url>
</repository>
</repositories>
<dependencies>
<!--Hadoop依赖-->
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>${hadoop.version}</version>
</dependency>
<!-- ZK依赖-->
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>${zk.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flume</groupId>
<artifactId>flume-ng-core</artifactId>
<version>${flume.version}</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.51</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.5</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<descriptors>
<descriptor>src/assembly/assembly.xml</descriptor>
</descriptors>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.wxx.bigdata.mr.ETLApp</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
通过IDEA的maven打包，生成的自定义包
运行 mvn clean install -Dmaven.test.skip=true 生成三个jar包，选择第二个，亲测有效
