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POShowing error while running WordCount.java
 

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  1. POShowing error while running WordCount.java
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    <p>I tried this code: </p> <pre><code>javac -verbose -classpath /var/root/hadoop-1.0.4/hadoop-1.0.4-core.jar WordCount.java -d /Users/amrita/desktop/hadoop/javatrail/wordcount_classes </code></pre> <p>I just get the following error:</p> <pre><code>parsing started WordCount.java] [parsing completed 12ms] [search path for source files: /var/root/hadoop-1.0.4/hadoop-1.0.4-core.jar] [search path for class files: /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/jsfd.jar,/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar,/System/Library/Frameworks/JavaVM.framework/Frameworks/JavaRuntimeSupport.framework/Resources/Java/JavaRuntimeSupport.jar,/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/ui.jar,/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/laf.jar,/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/sunrsasign.jar,/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/jsse.jar,/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/jce.jar,/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/charsets.jar,/Library/Java/Extensions/RXTXcomm.jar,/System/Library/Java/Extensions/AppleScriptEngine.jar,/System/Library/Java/Extensions/dns_sd.jar,/System/Library/Java/Extensions/j3daudio.jar,/System/Library/Java/Extensions/j3dcore.jar,/System/Library/Java/Extensions/j3dutils.jar,/System/Library/Java/Extensions/jai_codec.jar,/System/Library/Java/Extensions/jai_core.jar,/System/Library/Java/Extensions/mlibwrapper_jai.jar,/System/Library/Java/Extensions/MRJToolkit.jar,/System/Library/Java/Extensions/QTJava.zip,/System/Library/Java/Extensions/vecmath.jar,/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/ext/apple_provider.jar,/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/ext/dnsns.jar,/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/ext/localedata.jar,/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/ext/sunjce_provider.jar,/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/ext/sunpkcs11.jar,/var/root/hadoop-1.0.4/hadoop-1.0.4-core.jar] [loading java/io/IOException.class(java/io:IOException.class)] WordCount.java:5: package org.apache.hadoop.fs does not exist import org.apache.hadoop.fs.Path; ^ WordCount.java:6: package org.apache.hadoop.conf does not exist import org.apache.hadoop.conf.*; ^ WordCount.java:7: package org.apache.hadoop.io does not exist import org.apache.hadoop.io.*; ^ WordCount.java:8: package org.apache.hadoop.mapred does not exist import org.apache.hadoop.mapred.*; ^ WordCount.java:9: package org.apache.hadoop.util does not exist import org.apache.hadoop.util.*; ^ [loading java/lang/Object.class(java/lang:Object.class)] [loading java/lang/String.class(java/lang:String.class)] [loading java/lang/Exception.class(java/lang:Exception.class)] WordCount.java:11: cannot find symbol symbol : class MapReduceBase location: class org.myorg.WordCount public static class Map extends MapReduceBase implements Mapper&lt;LongWritable, Text, Text, IntWritable&gt; { ^ WordCount.java:11: cannot find symbol symbol : class Mapper location: class org.myorg.WordCount public static class Map extends MapReduceBase implements Mapper&lt;LongWritable, Text, Text, IntWritable&gt; { ^ WordCount.java:11: cannot find symbol symbol : class LongWritable location: class org.myorg.WordCount public static class Map extends MapReduceBase implements Mapper&lt;LongWritable, Text, Text, IntWritable&gt; { ^ [total 406ms] 48 errors </code></pre> <p>Is there any problem in my classpath? If so, how can I get the correct class path? My WordCount.java is in /Users/amrita/.... and hadoop in root, is there any privilege issue? I am not able to generate WordCount.class</p> <p>source code: WordCount.java</p> <pre><code>package org.myorg; import java.io.IOException; import java.util.*; import org.apache.hadoop.fs.Path; import org.apache.hadoop.conf.*; import org.apache.hadoop.io.*; import org.apache.hadoop.mapred.*; import org.apache.hadoop.util.*; public class WordCount { public static class Map extends MapReduceBase implements Mapper&lt;LongWritable, Text, Text, IntWritable&gt; { private final static IntWritable one = new IntWritable(1); private Text word = new Text(); public void map(LongWritable key, Text value, OutputCollector&lt;Text, IntWritable&gt; output, Reporter reporter) throws IOException { String line = value.toString(); StringTokenizer tokenizer = new StringTokenizer(line); while (tokenizer.hasMoreTokens()) { word.set(tokenizer.nextToken()); output.collect(word, one); } } } public static class Reduce extends MapReduceBase implements Reducer&lt;Text, IntWritable, Text, IntWritable&gt; { public void reduce(Text key, Iterator&lt;IntWritable&gt; values, OutputCollector&lt;Text, IntWritable&gt; output, Reporter reporter) throws IOException { int sum = 0; while (values.hasNext()) { sum += values.next().get(); } output.collect(key, new IntWritable(sum)); } } public static void main(String[] args) throws Exception { JobConf conf = new JobConf(WordCount.class); conf.setJobName("wordcount"); conf.setOutputKeyClass(Text.class); conf.setOutputValueClass(IntWritable.class); conf.setMapperClass(Map.class); conf.setCombinerClass(Reduce.class); conf.setReducerClass(Reduce.class); conf.setInputFormat(TextInputFormat.class); conf.setOutputFormat(TextOutputFormat.class); FileInputFormat.setInputPaths(conf, new Path(args[0])); FileOutputFormat.setOutputPath(conf, new Path(args[1])); JobClient.runJob(conf); } } </code></pre>
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    1. USUnmesha SreeVeni
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    1. COWorks here. Show me your source file.
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    2. COyes i uploaded.
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    3. COCompiles just fine.
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