我正在编写地图降低程序以比较两个文件。当我运行以外的程序时,请按照异常。
。Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/lang/StringUtils
at org.apache.hadoop.metrics2.lib.MutableMetricsFactory.getName(MutableMetricsFactory.java:119)
我的pom文件。
<dependencies>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-core</artifactId>
<version>0.20.2</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-mapreduce-client-core</artifactId>
<version>0.23.1</version>
</dependency>
<dependency>
<artifactId>guava</artifactId>
<groupId>com.google.guava</groupId>
<type>jar</type>
<version>15.0</version>
</dependency>
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2.1</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.3</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.1</version>
</dependency>
</dependencies>
任何帮助将不胜感激。
作为错误消息java.lang.NoClassDefFoundError: org/apache/commons/lang/StringUtils
告诉您,您需要将Commons-lang添加为依赖项:
<!-- https://mvnrepository.com/artifact/commons-lang/commons-lang -->
<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>2.3</version>
</dependency>
您添加了 commons-lang3
,它还具有类弦乐器,但包含包名称 org/apache/commons/lang3/StringUtils
。