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java编译找不到符号_javac编译时找不到符号？

發(fā)布時(shí)間：2023/12/1 编程问答 34 豆豆

生活随笔收集整理的這篇文章主要介紹了 java编译找不到符号_javac编译时找不到符号？小編覺得挺不錯(cuò)的,現(xiàn)在分享給大家,幫大家做個(gè)參考.

我是個(gè)新手，在linux使用java編程時(shí)，出現(xiàn)這個(gè)情況。

我把要引的包放在classpath中，紅色部分：

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

通過echo $CLASSPATH查看也能輸出結(jié)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 編譯出現(xiàn)：

[解析開始時(shí)間 RegularFileObject[wordcount.java]]

[解析已完成, 用時(shí) 24 毫秒]

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

[類文件的搜索路徑: /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: 錯(cuò)誤: 程序包org.apache.hadoop.conf不存在

import org.apache.hadoop.conf.Configuration;

wordcount.java:3: 錯(cuò)誤: 程序包org.apache.hadoop.fs不存在

import org.apache.hadoop.fs.Path;

wordcount.java:4: 錯(cuò)誤: 程序包org.apache.hadoop.io不存在

import org.apache.hadoop.io.IntWritable;

wordcount.java:5: 錯(cuò)誤: 程序包org.apache.hadoop.io不存在

import org.apache.hadoop.io.Text;

wordcount.java:6: 錯(cuò)誤: 程序包org.apache.hadoop.mapreduce不存在

import org.apache.hadoop.mapreduce.Job;

wordcount.java:7: 錯(cuò)誤: 程序包org.apache.hadoop.mapreduce不存在

import? org.apache.hadoop.mapreduce.Mapper;

wordcount.java:8: 錯(cuò)誤: 程序包org.apache.hadoop.mapreduce不存在

import org.apache.hadoop.mapreduce.Reducer;

wordcount.java:9: 錯(cuò)誤: 程序包org.apache.hadoop.mapreduce.lib.input不存在

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

wordcount.java:10: 錯(cuò)誤: 程序包org.apache.hadoop.mapreduce.lib.output不存在

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

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

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

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

wordcount.java:12: 錯(cuò)誤: 找不到符號

public static class? WordCountMapper extends? Mapper

符號:?? 類 Mapper

位置: 類 wordcount

wordcount.java:12: 錯(cuò)誤: 找不到符號

public static class? WordCountMapper extends? Mapper

符號:?? 類 Text

位置: 類 wordcount

wordcount.java:12: 錯(cuò)誤: 找不到符號

public static class? WordCountMapper extends? Mapper

符號:?? 類 Text

位置: 類 wordcount

wordcount.java:12: 錯(cuò)誤: 找不到符號

public static class? WordCountMapper extends? Mapper

符號:?? 類 IntWritable

位置: 類 wordcount

wordcount.java:14: 錯(cuò)誤: 找不到符號

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

符號:?? 類 IntWritable

位置: 類 WordCountMapper

wordcount.java:15: 錯(cuò)誤: 找不到符號

private? Text word=new Text();

符號:?? 類 Text

位置: 類 WordCountMapper

wordcount.java:16: 錯(cuò)誤: 找不到符號

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

符號:?? 類 Text

位置: 類 WordCountMapper

wordcount.java:16: 錯(cuò)誤: 找不到符號

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

符號:?? 類 Context

位置: 類 WordCountMapper

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

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

wordcount.java:26: 錯(cuò)誤: 找不到符號

public static class WordCountReducer extends Reducer{

符號:?? 類 Reducer

位置: 類 wordcount

wordcount.java:26: 錯(cuò)誤: 找不到符號

public static class WordCountReducer extends Reducer{

符號:?? 類 Text

位置: 類 wordcount

wordcount.java:26: 錯(cuò)誤: 找不到符號

public static class WordCountReducer extends Reducer{

符號:?? 類 IntWritable

位置: 類 wordcount

wordcount.java:26: 錯(cuò)誤: 找不到符號

public static class WordCountReducer extends Reducer{

符號:?? 類 Text

位置: 類 wordcount

wordcount.java:26: 錯(cuò)誤: 找不到符號

public static class WordCountReducer extends Reducer{

符號:?? 類 IntWritable

位置: 類 wordcount

wordcount.java:27: 錯(cuò)誤: 找不到符號

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

符號:?? 類 Text

位置: 類 WordCountReducer

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

wordcount.java:27: 錯(cuò)誤: 找不到符號

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

符號:?? 類 IntWritable

位置: 類 WordCountReducer

wordcount.java:27: 錯(cuò)誤: 找不到符號

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

符號:?? 類 Context

位置: 類 WordCountReducer

[正在檢查wordcount]

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

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

wordcount.java:14: 錯(cuò)誤: 找不到符號

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

符號:?? 類 IntWritable

位置: 類 WordCountMapper

wordcount.java:15: 錯(cuò)誤: 找不到符號

private? Text word=new Text();

符號:?? 類 Text

位置: 類 WordCountMapper

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

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

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

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

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

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

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

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

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

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

wordcount.java:30: 錯(cuò)誤: 找不到符號

for(IntWritable? val1? : values)

符號:?? 類 IntWritable

位置: 類 WordCountReducer

wordcount.java:34: 錯(cuò)誤: 找不到符號

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

符號:?? 類 IntWritable

位置: 類 WordCountReducer

wordcount.java:38: 錯(cuò)誤: 找不到符號

Configuration conf1=new Configuration();

符號:?? 類 Configuration

位置: 類 wordcount

wordcount.java:38: 錯(cuò)誤: 找不到符號

Configuration conf1=new Configuration();

符號:?? 類 Configuration

位置: 類 wordcount

wordcount.java:39: 錯(cuò)誤: 找不到符號

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

符號:?? 類 Job

位置: 類 wordcount

wordcount.java:39: 錯(cuò)誤: 找不到符號

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

符號:?? 類 Job

位置: 類 wordcount

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

wordcount.java:43: 錯(cuò)誤: 找不到符號

job.setOutputKeyClass(Text.class);

符號:?? 類 Text

位置: 類 wordcount

wordcount.java:44: 錯(cuò)誤: 找不到符號

job.setOutputValueClass(IntWritable.class);

符號:?? 類 IntWritable

位置: 類 wordcount

wordcount.java:45: 錯(cuò)誤: 找不到符號

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

符號:?? 類 Path

位置: 類 wordcount

wordcount.java:45: 錯(cuò)誤: 找不到符號

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

符號:?? 變量 FileInputFormat

位置: 類 wordcount

wordcount.java:46: 錯(cuò)誤: 找不到符號

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

符號:?? 類 Path

位置: 類 wordcount

wordcount.java:46: 錯(cuò)誤: 找不到符號

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

符號:?? 變量 FileOutputFormat

位置: 類 wordcount

[正在加載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 個(gè)錯(cuò)誤