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POHadoop ToolRunner fails with NoClassDefFoundError
 

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  1. POHadoop ToolRunner fails with NoClassDefFoundError
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    <p>I have a created a simple MapReduce Driver that implements the Tool interface. But when I try to run the job in Eclipse, I get a <code>NoClassDefFoundError</code> before the <code>run()</code> method is invoked. </p> <p>I am running <code>Hadoop 0.20.2</code> on <code>Ubuntu 10.04 LTS</code>. The source code and stack trace are provided below. Any assistance will be greatly appreciated.</p> <h2>Sourcecode</h2> <pre><code>import org.apache.hadoop.conf.*; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.*; import org.apache.hadoop.mapreduce.*; import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; import org.apache.hadoop.util.*; public class MyTestDriver extends Configured implements Tool { @Override public int run(String[] args) throws Exception { if (args.length != 2) { System.err.printf("Usage: %s [generic options] &lt;input&gt; &lt;output&gt;\n", getClass().getSimpleName()); ToolRunner.printGenericCommandUsage(System.err); return -1; } // Code here to submit Hadoop Job ... return 0; } /** * @param args */ public static void main(String[] args) throws Exception { int exitCode = ToolRunner.run(new MyTestDriver(), args); System.exit(exitCode); } </code></pre> <p>}</p> <h2>Stacktrace</h2> <blockquote> <p>Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/cli/ParseException at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:59) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79) at MaxTemperatureDriver.main(MaxTemperatureDriver.java:44) Caused by: java.lang.ClassNotFoundException: org.apache.commons.cli.ParseException at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) ... 3 more</p> </blockquote>
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    1. USPeter Wippermann
    1. USDave
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    1. COThere is an answer posted here: http://stackoverflow.com/questions/6890087/problem-with-libjars-in-hadoop
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      1. POHadoop ToolRunner fails with NoClassDefFoundError
      1. USVladimir Kroz
 

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