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POjava.lang.NoSuchMethodException resulting from incorrect classpath?
 

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    <p>I am having, what I can only guess is a schoolboy error with the classpath while trying to execute the following command (Mahout and Lucene are from Apache):</p> <pre><code>bin/mahout seq2sparse -i &lt;input-dir&gt; -o &lt;output-dir&gt; -wt tfidf -chunk 50 \ -a org.apache.lucene.analysis.standard.StandardAnalyzer --minSupport 2\ --minDF 2 --maxDFPercent 75 --norm 2 </code></pre> <p>This gives me the error:</p> <pre><code>Exception in thread "main" java.lang.IllegalStateException: java.lang.NoSuchMethodException: org.apache.lucene.analysis.standard.StandardAnalyzer.&lt;init&gt;() at org.apache.mahout.common.ClassUtils.instantiateAs(ClassUtils.java:68) at org.apache.mahout.vectorizer.SparseVectorsFromSequenceFiles.run(SparseVectorsFromSequenceFiles.java:204) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79) at org.apache.mahout.vectorizer.SparseVectorsFromSequenceFiles.main(SparseVectorsFromSequenceFiles.java:55) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68) at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139) at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:188) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.util.RunJar.main(RunJar.java:156) Caused by: java.lang.NoSuchMethodException: org.apache.lucene.analysis.standard.StandardAnalyzer.&lt;init&gt;() at java.lang.Class.getConstructor0(Class.java:2706) at java.lang.Class.getConstructor(Class.java:1657) at org.apache.mahout.common.ClassUtils.instantiateAs(ClassUtils.java:62) ... 16 more </code></pre> <p>The method expected is part of the Apache Lucene library, it is not my own code. I have added the Lucene jars to the classpath using the following: <code>export CLASSPATH=$CLASSPATH:mahout-distribution-0.6/lib/*</code></p> <p>As a side note, there is no autocompletion when specifying the class at the "-a" flag. Is this an indication of my jar not being visible? I had this autocompletion on another system.</p> <p>My machine is running Java(TM) SE Runtime Environment (build 1.6.0_26-b03)</p>
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    1. COI'd start by modifying your main function and simply start by doing a `System.out.println("Classpath = " + System.getProperty("java.class.path");` and inspect the printed class path to ensure that it contains the jars that you expect.
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      1. USAlderath
 

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