在带有maven的netbeans中,我添加了org.apache.lucene lucene core 4.2.0的第三方依赖项,因为较新的核心版本不包含openbitset类。以下是pom:
<?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>org.apache.hadoop</groupId>
<artifactId>DuccProject</artifactId>
<version>2.7.3</version>
<packaging>jar</packaging>
<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>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-hdfs</artifactId>
<version>2.0.0-cdh4.0.0</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-auth</artifactId>
<version>2.0.0-cdh4.0.0</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-common</artifactId>
<version>2.0.0-cdh4.0.0</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-core</artifactId>
<version>2.0.0-mr1-cdh4.0.1</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.lucene</groupId>
<artifactId>lucene-core</artifactId>
<version>4.2.0</version>
</dependency>
<dependency>
<groupId>it.unimi.dsi</groupId>
<artifactId>fastutil</artifactId>
<version>7.0.12</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
我可以通过netbeans使用包中包含的所有类。我在包含.pom文件的目录中构建了jar,其中包含“mvn clean install”。但是当我从cli运行jar时:
bin/hadoop jar ~/NetBeansProjects/DuccProject/DuccProject/target/DuccProject-2.7.3.jar org.apache.hadoop.duccproject.Ducc /hdfs/path/to/input /hdfs/path/to/output
如果org.apache.hadoop.duccproject.ducc是我的主类的路径,我将面临以下错误:
java.lang.Exception: java.lang.NoClassDefFoundError: org/apache/lucene/util/OpenBitSet
at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:529)
Caused by: java.lang.NoClassDefFoundError: org/apache/lucene/util/OpenBitSet
at org.apache.hadoop.columns.ColumnCombinationBitset.<init>(ColumnCombinationBitset.java:33)
at org.apache.hadoop.duccproject.ParserReducer.reduce(ParserReducer.java:53)
at org.apache.hadoop.duccproject.ParserReducer.reduce(ParserReducer.java:24)
at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:171)
at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:627)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:389)
at org.apache.hadoop.mapred.LocalJobRunner$Job$ReduceTaskRunnable.run(LocalJobRunner.java:319)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: org.apache.lucene.util.OpenBitSet
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 12 more
16/09/04 17:41:53 INFO mapreduce.Job: map 100% reduce 0%
1条答案
按热度按时间ecfsfe2w1#
错误表示应用程序找不到所需的类,在运行时,还需要使用hadoop命令选项提供lucenecore4.2.0jar的路径,如下所示
您还可以看到其他hadoop命令选项