java.lang.ClassNotFoundException: org.apache.hadoop.mapred.JobConf

2016-05-31 16:06:28   作者：MangoCool   来源：MangoCool

在运行hadoop相关程序时报异常：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/mapred/JobConf
	at org.apache.hadoop.hive.conf.HiveConf.initialize(HiveConf.java:3256)
	at org.apache.hadoop.hive.conf.HiveConf.<init>(HiveConf.java:3219)
	at Test.main(Test.java:13)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.mapred.JobConf
	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	... 8 more

出现此异常，就是缺少相关的依赖包，你检查一下以下四个依赖包是否齐全：

hadoop-mapreduce-client-core-2.7.2.jar

hadoop-common-2.7.2.jar

hadoop-mapreduce-client-common-2.7.2.jar

hadoop-mapreduce-client-jobclient-2.7.2.jar

解决办法：

1、maven包：

<dependencies>
    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-mapreduce-client-core</artifactId>
        <version>2.7.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-common</artifactId>
        <version>2.7.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-mapreduce-client-common</artifactId>
        <version>2.7.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-mapreduce-client-jobclient</artifactId>
        <version>2.7.2</version>
    </dependency>
</dependencies>

2、jar包下载：

http://mvnrepository.com，用artifactId搜索对应的jar包，下载即可。

标签： hive hadoop exception

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