登录
当前位置： 首页 > 知识库问答 >
问题：

包org.apache.hadoop.conf不存在

宋华美
2023-03-14

我是编译Hadoop代码的新手，知道这个问题已经被回答过多次了。但是，我仍然很难找到正确的类路径来编译WordCount.java代码。我正在运行一个CentOS版本7。

我的Hadoop版本是：

Hadoop 2.7.1 Subversion   
https://git-wip-us.apache.org/repos/asf/hadoop.git -r 15ecc87ccf4a0228f35af08fc56de536e6ce657a   
Compiled by jenkins on 2015-06-29T06:04Z  
Compiled with protoc 2.5.0  
From source with checksum fc0a1a23fc1868e4d5ee7fa2b28a58a  
This command was run using /usr/local/hadoop/share/hadoop/common/hadoop-common-2.7.1.jar

当我执行echo$path时，我得到了以下结果：

java version "1.7.0_91"
OpenJDK Runtime Environment (rhel-2.6.2.1.el7_1-x86_64 u91-b00)
OpenJDK 64-Bit Server VM (build 24.91-b01, mixed mode)

export JAVA_HOME=/usr/lib/jvm/jre-1.7.0-openjdk/
export PATH=$PATH:$JAVA_HOME

export HADOOP_INSTALL=/usr/local/hadoop 
export PATH=$PATH:$HADOOP_INSTALL/bin
export PATH=$PATH:$HADOOP_INSTALL/sbin
export HADOOP_MAPRED_HOME=$HADOOP_INSTALL
export HADOOP_COMMON_HOME=$HADOOP_INSTALL
export HADOOP_HDFS_HOME=$HADOOP_INSTALL
export YARN_HOME=$HADOOP_INSTALL
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_INSTALL/lib/native

WordCount.java:5: error: package org.apache.hadoop.conf does not exist
import org.apache.hadoop.conf.*;
^
WordCount.java:6: error: package org.apache.hadoop.fs does not exist
import org.apache.hadoop.fs.*;
^
WordCount.java:7: error: package org.apache.hadoop.conf does not exist
import org.apache.hadoop.conf.*;
^
WordCount.java:8: error: package org.apache.hadoop.io does not exist
import org.apache.hadoop.io.*;
^
WordCount.java:9: error: package org.apache.hadoop.mapreduce does not exist
import org.apache.hadoop.mapreduce.*;
^
WordCount.java:10: error: package org.apache.hadoop.mapreduce.lib.input does not exist
import org.apache.hadoop.mapreduce.lib.input.*;
^
WordCount.java:11: error: package org.apache.hadoop.mapreduce.lib.output does not exist
import org.apache.hadoop.mapreduce.lib.output.*;
^
WordCount.java:12: error: package org.apache.hadoop.util does not exist
import org.apache.hadoop.util.*;
^
WordCount.java:14: error: cannot find symbol
public class WordCount extends Configured implements Tool {
                               ^
  symbol: class Configured
WordCount.java:14: error: cannot find symbol
public class WordCount extends Configured implements Tool {
                                                     ^
  symbol: class Tool
WordCount.java:47: error: cannot find symbol
    public static class Map extends Mapper<LongWritable, Text, Text, IntWritable> {
                                    ^
  symbol:   class Mapper
  location: class WordCount
WordCount.java:47: error: cannot find symbol
    public static class Map extends Mapper<LongWritable, Text, Text, IntWritable> {
                                           ^
  symbol:   class LongWritable
  location: class WordCount
WordCount.java:47: error: cannot find symbol
    public static class Map extends Mapper<LongWritable, Text, Text, IntWritable> {
                                                         ^
  symbol:   class Text
  location: class WordCount
WordCount.java:47: error: cannot find symbol
    public static class Map extends Mapper<LongWritable, Text, Text, IntWritable> {
                                                               ^
  symbol:   class Text
  location: class WordCount
WordCount.java:47: error: cannot find symbol
    public static class Map extends Mapper<LongWritable, Text, Text, IntWritable> {
                                                                     ^
  symbol:   class IntWritable
  location: class WordCount
WordCount.java:48: error: cannot find symbol
    private final static IntWritable one = new IntWritable(1);
                         ^
  symbol:   class IntWritable
  location: class Map
WordCount.java:49: error: cannot find symbol
    private Text word = new Text();
            ^
  symbol:   class Text
  location: class Map
WordCount.java:52: error: cannot find symbol
    public void map(LongWritable key, Text value,
                    ^
  symbol:   class LongWritable
  location: class Map
WordCount.java:52: error: cannot find symbol
    public void map(LongWritable key, Text value,
                                      ^
  symbol:   class Text
  location: class Map
WordCount.java:53: error: package Mapper does not exist
            Mapper.Context context) throws IOException, InterruptedException {
                  ^
WordCount.java:63: error: cannot find symbol
    public static class Reduce extends Reducer<Text, IntWritable, Text, IntWritable> {
                                       ^
  symbol:   class Reducer
  location: class WordCount
WordCount.java:63: error: cannot find symbol
    public static class Reduce extends Reducer<Text, IntWritable, Text, IntWritable> {
                                               ^
  symbol:   class Text
  location: class WordCount
WordCount.java:63: error: cannot find symbol
    public static class Reduce extends Reducer<Text, IntWritable, Text, IntWritable> {
                                                     ^
  symbol:   class IntWritable
  location: class WordCount
WordCount.java:63: error: cannot find symbol
    public static class Reduce extends Reducer<Text, IntWritable, Text, IntWritable> {
                                                                  ^
  symbol:   class Text
  location: class WordCount
WordCount.java:63: error: cannot find symbol
    public static class Reduce extends Reducer<Text, IntWritable, Text, IntWritable> {
                                                                        ^
  symbol:   class IntWritable
  location: class WordCount
WordCount.java:66: error: cannot find symbol
    public void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
                       ^
  symbol:   class Text
  location: class Reduce
WordCount.java:66: error: cannot find symbol
    public void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
                                          ^
  symbol:   class IntWritable
  location: class Reduce
WordCount.java:66: error: cannot find symbol
    public void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
                                                               ^
  symbol:   class Context
  location: class Reduce
WordCount.java:17: error: cannot find symbol
    int res = ToolRunner.run(new WordCount(), args);
              ^
  symbol:   variable ToolRunner
  location: class WordCount
WordCount.java:22: error: cannot find symbol
    Path inputPath = new Path(args[0]);
    ^
  symbol:   class Path
  location: class WordCount
WordCount.java:22: error: cannot find symbol
    Path inputPath = new Path(args[0]);
                         ^
  symbol:   class Path
  location: class WordCount
WordCount.java:23: error: cannot find symbol
    Path outputPath = new Path(args[1]);
    ^
  symbol:   class Path
  location: class WordCount
WordCount.java:23: error: cannot find symbol
    Path outputPath = new Path(args[1]);
                          ^
  symbol:   class Path
  location: class WordCount
WordCount.java:25: error: cannot find symbol
    Configuration conf = getConf();
    ^
  symbol:   class Configuration
  location: class WordCount
WordCount.java:25: error: cannot find symbol
    Configuration conf = getConf();
                         ^
  symbol:   method getConf()
  location: class WordCount
WordCount.java:26: error: cannot find symbol
    Job job = new Job(conf, this.getClass().toString());
    ^
  symbol:   class Job
  location: class WordCount
WordCount.java:26: error: cannot find symbol
    Job job = new Job(conf, this.getClass().toString());
                  ^
  symbol:   class Job
  location: class WordCount
WordCount.java:26: error: cannot find symbol
    Job job = new Job(conf, this.getClass().toString());
                                ^
  symbol: method getClass()
WordCount.java:28: error: cannot find symbol
    FileInputFormat.setInputPaths(job, inputPath);
    ^
  symbol:   variable FileInputFormat
  location: class WordCount
WordCount.java:29: error: cannot find symbol
    FileOutputFormat.setOutputPath(job, outputPath);
    ^
  symbol:   variable FileOutputFormat
  location: class WordCount
WordCount.java:33: error: cannot find symbol
    job.setInputFormatClass(TextInputFormat.class);
                            ^
  symbol:   class TextInputFormat
  location: class WordCount
WordCount.java:34: error: cannot find symbol
    job.setOutputFormatClass(TextOutputFormat.class);
                             ^
  symbol:   class TextOutputFormat
  location: class WordCount
WordCount.java:35: error: cannot find symbol
    job.setMapOutputKeyClass(Text.class);
                             ^
  symbol:   class Text
  location: class WordCount
WordCount.java:36: error: cannot find symbol
    job.setMapOutputValueClass(IntWritable.class);
                               ^
  symbol:   class IntWritable
  location: class WordCount
WordCount.java:37: error: cannot find symbol
    job.setOutputKeyClass(Text.class);
                          ^
  symbol:   class Text
  location: class WordCount
WordCount.java:38: error: cannot find symbol
    job.setOutputValueClass(IntWritable.class);
                            ^
  symbol:   class IntWritable
  location: class WordCount
WordCount.java:48: error: cannot find symbol
    private final static IntWritable one = new IntWritable(1);
                                               ^
  symbol:   class IntWritable
  location: class Map
WordCount.java:49: error: cannot find symbol
    private Text word = new Text();
                            ^
  symbol:   class Text
  location: class Map
WordCount.java:51: error: method does not override or implement a method from a supertype
    @Override
    ^
WordCount.java:68: error: cannot find symbol
    for (IntWritable value : values) {
         ^
  symbol:   class IntWritable
  location: class Reduce
WordCount.java:72: error: cannot find symbol
    context.write(key, new IntWritable(sum));
                           ^
  symbol:   class IntWritable
  location: class Reduce
WordCount.java:65: error: method does not override or implement a method from a supertype
    @Override
    ^
52 errors

有人能给我指个正确的方向吗？谢谢你。

共有1个答案

江航
2023-03-14

您可以像下面这样运行它：

javac WordCount.java -cp $(hadoop classpath)

如果出现以下错误：

ZSH：未找到命令：hadoop

javac WordCount.java -cp $(/usr/local/Cellar/hadoop/2.8.0/bin/hadoop classpath)
 类似资料：
  • “包的包名不存在”

    我正在尝试在intelliJ中制作一个jar文件。我的目录中保存了所有的java类是C：\transProject\src\cege。在cege中有一个包用户界面，其中有一个类guiMain。而且我已经在我的Main（）类中导入了guiMain（）。 我有以下代码行： 包装cege； 进口cege。用户界面。圭曼； 当我在intelliJ中使用终端并编写命令时： C:\trafficProject

  • 包java.nio.file不存在

    我正在研究如何从命令行编译Java。我得到的是： 我得到的是： HelloWorld： inner.java 内部2.Java 我正在用编译这个文件，这个文件工作得很好。 现在我的理解是，因为helloworld.java在它的import语句中引用了其他包，所以javac会去编译这些包。我猜对于所有的Java包，javac在内部都有。 反正-如果我在helloworld.java中添加以下导入行

  • 包R不存在

    我得到了一个可怕的软件包，它根本不存在，简直要了我的命。代码很好，我在市场上有运行代码的应用程序。 现在它正在影响简单的应用程序。o.0 <代码>R.string。app_name是错误的my 。应该对应于R.java

  • 包javafx.util不存在？

    我使用的是openjdk版本“1.8.0_252”，我还单独安装了javafx，目前的版本是javafx.version=11.0.2-internal。我已经在IntelliJ中添加了javafx库路径。编写代码javafx对时没有错误。但是，当我使用sudo mvn clean install构建项目时，我出现了以下错误，导致构建失败：

  • 包org.apache.hadoop.fs不存在

  • 包javacardx.framework不存在

    我是新手，正在尝试为JavaCard开发一个applet。当我从一个网站上跟踪一个示例代码时，我被困在这里了。NetBeans表示JavaCardX.Framework包不存在。 我就不会正确地链接Java经典Jar文件。请帮帮我

相关问答

包org.apache.hadoop.fs不存在包javacardx.framework不存在twitter4j包不存在包org.languagetool.language.BritishEnglish不存在Eclipse-包org.testng不存在

相关文章

编译错误：包javax.servlet不存在Java软件包不存在错误java包不存在且源文件错误包android.support.v4.app不存在; 在Android Studio 0.8中带渐变的Android Studio：包r不存在

相关阅读

Dart包java.util.zip包案例-Swing打包成jar包C语言函数中的变量（包括：作用域、存储类型）粘包问题与拆包问题

相关工具

《Node.js 包教不包会》小面包Javascript工具包PCI工具包外存

相关文档

Node.js 包教不包会webpack2 包教不包会设计模式包教不包会Nutz 使用手册（核心包）Windows 连接管理器管理工具包 帮助文档
快捷导航： 新手教程 算法原理 架构设计 Java进阶 数据库进阶 大厂专栏 面试经验 编程笔记 编程问答 所有专题 文档资料 工具软件 电子书籍 小牛导航
在线工具： 房贷计算器 个税计算器 Linux命令查询 Json格式化 正则表达式 颜色转换 AES加解密 SHA1加密 MD5加密 毒鸡汤 字数统计 随机密码生成 进制转换 Base64编解码 励志句子
Copyright © 2019-2024 小牛知识库@xnip.cn. All Rights Reserved.