java编译找不到符号_javac编译时找不到符号？

我是个新手，在linux使用java编程时，出现这个情况。

我把要引的包放在classpath中，红色部分：

export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$HADOOP_HOME/hadoop-1.0.4.core.jar:${CLASSPATH}

通过echo $CLASSPATH查看也能输出结果。

mport org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.fs.Path;

import org.apache.hadoop.io.IntWritable;

import org.apache.hadoop.io.Text;

import org.apache.hadoop.mapreduce.Job;

import org.apache.hadoop.mapreduce.Mapper;

import org.apache.hadoop.mapreduce.Reducer;

import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;

import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

public class wordcount {

public static class WordCountMapper extends Mapper

{

private final static IntWritable one=new IntWritable(1);

private Text word=new Text();

public void map(Object key, Text value,Context context) throws IOException,InterruptedException{

String[] words=value.toString().split(" ");

for(String str : words)

{

word.set(str);

context.write(word,one);

}

public static class WordCountReducer extends Reducer{

public void reduce(Text key,Iterable values,Context context) throws IOException,InterruptedException

{

int total =0;

for(IntWritable val1 : values)

{

total++;

}

context.write(key,new IntWritable(total));

}

public static void main(String[] args) throws Exception {

Configuration conf1=new Configuration();

Job job=new Job(conf1,"word count");

job.setJarByClass(wordcount.class);

job.setMapperClass(WordCountMapper.class);

job.setReducerClass(WordCountReducer.class);

job.setOutputKeyClass(Text.class);

job.setOutputValueClass(IntWritable.class);

FileInputFormat.addInputPath(job, new Path(args[0]));

FileOutputFormat.setOutputPath(job, new Path(args[1]));

System.exit(job.waitForCompletion(true ) ? 0:1);

}

使用javac wordcount.java 编译出现：

[解析开始时间 RegularFileObject[wordcount.java]]

[解析已完成, 用时 24 毫秒]

[源文件的搜索路径: .,/usr/lib/jvm/jdk1.8.0_73/lib/dt.jar,/usr/lib/jvm/jdk1.8.0_73/lib/tools.jar]

[类文件的搜索路径: /usr/lib/jvm/jdk1.8.0_73/jre/lib/resources.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/rt.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/sunrsasign.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/jsse.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/jce.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/charsets.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/jfr.jar,/usr/lib/jvm/jdk1.8.0_73/jre/classes,/usr/lib/jvm/jdk1.8.0_73/jre/lib/ext/jaccess.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/ext/sunpkcs11.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/ext/zipfs.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/ext/dnsns.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/ext/jfxrt.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/ext/nashorn.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/ext/sunec.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/ext/localedata.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/ext/cldrdata.jar,/usr/lib/jvm/jdk1.8.0_73/jre/lib/ext/sunjce_provider.jar,.,/usr/lib/jvm/jdk1.8.0_73/lib/dt.jar,/usr/lib/jvm/jdk1.8.0_73/lib/tools.jar/usr/local/Hadoop/hadoop-1.0.4.core.jar]

wordcount.java:2: 错误: 程序包org.apache.hadoop.conf不存在

import org.apache.hadoop.conf.Configuration;

wordcount.java:3: 错误: 程序包org.apache.hadoop.fs不存在

import org.apache.hadoop.fs.Path;

wordcount.java:4: 错误: 程序包org.apache.hadoop.io不存在

import org.apache.hadoop.io.IntWritable;

wordcount.java:5: 错误: 程序包org.apache.hadoop.io不存在

import org.apache.hadoop.io.Text;

wordcount.java:6: 错误: 程序包org.apache.hadoop.mapreduce不存在

import org.apache.hadoop.mapreduce.Job;

wordcount.java:7: 错误: 程序包org.apache.hadoop.mapreduce不存在

import org.apache.hadoop.mapreduce.Mapper;

wordcount.java:8: 错误: 程序包org.apache.hadoop.mapreduce不存在

import org.apache.hadoop.mapreduce.Reducer;

wordcount.java:9: 错误: 程序包org.apache.hadoop.mapreduce.lib.input不存在

import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;

wordcount.java:10: 错误: 程序包org.apache.hadoop.mapreduce.lib.output不存在

import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Object.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/String.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Exception.class)]]

wordcount.java:12: 错误: 找不到符号

public static class WordCountMapper extends Mapper

符号: 类 Mapper

位置: 类 wordcount

wordcount.java:12: 错误: 找不到符号

public static class WordCountMapper extends Mapper

符号: 类 Text

位置: 类 wordcount

wordcount.java:12: 错误: 找不到符号

public static class WordCountMapper extends Mapper

符号: 类 Text

位置: 类 wordcount

wordcount.java:12: 错误: 找不到符号

public static class WordCountMapper extends Mapper

符号: 类 IntWritable

位置: 类 wordcount

wordcount.java:14: 错误: 找不到符号

private final static IntWritable one=new IntWritable(1);

符号: 类 IntWritable

位置: 类 WordCountMapper

wordcount.java:15: 错误: 找不到符号

private Text word=new Text();

符号: 类 Text

位置: 类 WordCountMapper

wordcount.java:16: 错误: 找不到符号

public void map(Object key, Text value,Context context) throws IOException,InterruptedException{

符号: 类 Text

位置: 类 WordCountMapper

wordcount.java:16: 错误: 找不到符号

public void map(Object key, Text value,Context context) throws IOException,InterruptedException{

符号: 类 Context

位置: 类 WordCountMapper

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/io/IOException.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/InterruptedException.class)]]

wordcount.java:26: 错误: 找不到符号

public static class WordCountReducer extends Reducer{

符号: 类 Reducer

位置: 类 wordcount

wordcount.java:26: 错误: 找不到符号

public static class WordCountReducer extends Reducer{

符号: 类 Text

位置: 类 wordcount

wordcount.java:26: 错误: 找不到符号

public static class WordCountReducer extends Reducer{

符号: 类 IntWritable

位置: 类 wordcount

wordcount.java:26: 错误: 找不到符号

public static class WordCountReducer extends Reducer{

符号: 类 Text

位置: 类 wordcount

wordcount.java:26: 错误: 找不到符号

public static class WordCountReducer extends Reducer{

符号: 类 IntWritable

位置: 类 wordcount

wordcount.java:27: 错误: 找不到符号

public void reduce(Text key,Iterable values,Context context) throws IOException,InterruptedException

符号: 类 Text

位置: 类 WordCountReducer

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Iterable.class)]]

wordcount.java:27: 错误: 找不到符号

public void reduce(Text key,Iterable values,Context context) throws IOException,InterruptedException

符号: 类 IntWritable

位置: 类 WordCountReducer

wordcount.java:27: 错误: 找不到符号

public void reduce(Text key,Iterable values,Context context) throws IOException,InterruptedException

符号: 类 Context

位置: 类 WordCountReducer

[正在检查wordcount]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/io/Serializable.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/AutoCloseable.class)]]

wordcount.java:14: 错误: 找不到符号

private final static IntWritable one=new IntWritable(1);

符号: 类 IntWritable

位置: 类 WordCountMapper

wordcount.java:15: 错误: 找不到符号

private Text word=new Text();

符号: 类 Text

位置: 类 WordCountMapper

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Throwable.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Byte.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Character.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Short.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Long.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Float.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Integer.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Double.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Boolean.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Void.class)]]

wordcount.java:30: 错误: 找不到符号

for(IntWritable val1 : values)

符号: 类 IntWritable

位置: 类 WordCountReducer

wordcount.java:34: 错误: 找不到符号

context.write(key,new IntWritable(total));

符号: 类 IntWritable

位置: 类 WordCountReducer

wordcount.java:38: 错误: 找不到符号

Configuration conf1=new Configuration();

符号: 类 Configuration

位置: 类 wordcount

wordcount.java:38: 错误: 找不到符号

Configuration conf1=new Configuration();

符号: 类 Configuration

位置: 类 wordcount

wordcount.java:39: 错误: 找不到符号

Job job=new Job(conf1,"word count");

符号: 类 Job

位置: 类 wordcount

wordcount.java:39: 错误: 找不到符号

Job job=new Job(conf1,"word count");

符号: 类 Job

位置: 类 wordcount

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Class.class)]]

wordcount.java:43: 错误: 找不到符号

job.setOutputKeyClass(Text.class);

符号: 类 Text

位置: 类 wordcount

wordcount.java:44: 错误: 找不到符号

job.setOutputValueClass(IntWritable.class);

符号: 类 IntWritable

位置: 类 wordcount

wordcount.java:45: 错误: 找不到符号

FileInputFormat.addInputPath(job, new Path(args[0]));

符号: 类 Path

位置: 类 wordcount

wordcount.java:45: 错误: 找不到符号

FileInputFormat.addInputPath(job, new Path(args[0]));

符号: 变量 FileInputFormat

位置: 类 wordcount

wordcount.java:46: 错误: 找不到符号

FileOutputFormat.setOutputPath(job, new Path(args[1]));

符号: 类 Path

位置: 类 wordcount

wordcount.java:46: 错误: 找不到符号

FileOutputFormat.setOutputPath(job, new Path(args[1]));

符号: 变量 FileOutputFormat

位置: 类 wordcount

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/jdk1.8.0_73/lib/ct.sym(META-INF/sym/rt.jar/java/lang/System.class)]]

[共 363 毫秒]

39 个错误