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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (MAHOUT-1006) Example from book no longer works - prepare20newsgroups broken with Lucene upgrade
Date Sun, 03 Jun 2012 16:40:23 GMT

     [ https://issues.apache.org/jira/browse/MAHOUT-1006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Grant Ingersoll reassigned MAHOUT-1006:
---------------------------------------

    Assignee: Grant Ingersoll  (was: Ted Dunning)
    
> Example from book no longer works - prepare20newsgroups broken with Lucene upgrade
> ----------------------------------------------------------------------------------
>
>                 Key: MAHOUT-1006
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1006
>             Project: Mahout
>          Issue Type: Bug
>    Affects Versions: 0.7
>            Reporter: Ted Dunning
>            Assignee: Grant Ingersoll
>            Priority: Critical
>             Fix For: 0.7
>
>         Attachments: MAHOUT-1006.patch
>
>
> The StandardAnalyzer from Lucene no longer has a no-args constructor.  Our code uses
reflection to create this class, but looks for a no-args constructor and that causes this:
> {code}
> ./bin/mahout prepare20newsgroups -p 20news-bydate-train/ -o 20news-train/ -a org.apache.lucene.analysis.standard.StandardAnalyzer
-c UTF-8  
> MAHOUT_LOCAL is not set; adding HADOOP_CONF_DIR to classpath.
> no HADOOP_HOME set, running locally
> Unable to find a $JAVA_HOME at "/usr", continuing with system-provided Java...
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in [jar:file:/Users/hadoop/mahout/examples/target/mahout-examples-0.7-SNAPSHOT-job.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in [jar:file:/Users/hadoop/mahout/examples/target/dependency/slf4j-jcl-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in [jar:file:/Users/hadoop/mahout/examples/target/dependency/slf4j-log4j12-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
> Exception in thread "main" java.lang.IllegalStateException: java.lang.NoSuchMethodException:
org.apache.lucene.analysis.standard.StandardAnalyzer.<init>()
> 	at org.apache.mahout.common.ClassUtils.instantiateAs(ClassUtils.java:68)
> 	at org.apache.mahout.common.ClassUtils.instantiateAs(ClassUtils.java:28)
> 	at org.apache.mahout.classifier.bayes.PrepareTwentyNewsgroups.main(PrepareTwentyNewsgroups.java:89)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at java.lang.reflect.Method.invoke(Method.java:597)
> 	at org.apache.hadoop.util.ProgramDriver$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)
> Caused by: java.lang.NoSuchMethodException: org.apache.lucene.analysis.standard.StandardAnalyzer.<init>()
> 	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)
> 	... 9 more
> {code}
> This is really bad.

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