引起原因:java.lang.ClassNotFoundException:classpath [英] Caused by: java.lang.ClassNotFoundException: classpath

问题描述

我正在尝试从 https://cwiki运行Wikipedia Bayes示例.apache.org/confluence/display/MAHOUT/Wikipedia + Bayes + Example

当我运行以下命令时:$ MAHOUT_HOME/bin/mahout wikipediaXMLSplitter -d $ MAHOUT_HOME/examples/temp/enw​​iki-latest-pages-articles10.xml -o Wikipedia/chunks -c 64

When I ran the following command : $MAHOUT_HOME/bin/mahout wikipediaXMLSplitter -d $MAHOUT_HOME/examples/temp/enwiki-latest-pages-articles10.xml -o wikipedia/chunks -c 64

我收到此错误:

Exception in thread "main" java.lang.NoClassDefFoundError: classpath
Caused by: java.lang.ClassNotFoundException: classpath
        at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:336)
Running on hadoop, using /x/.../bin/hadoop and HADOOP_CONF_DIR=
MAHOUT-JOB: /x/.../mahout-distribution-0.7/mahout-examples-0.7-job.jar
12/07/25 11:22:06 WARN driver.MahoutDriver: Unable to add class: wikipediaXMLSplitter
12/07/25 11:22:06 WARN driver.MahoutDriver: No wikipediaXMLSplitter.props found on classpath, will use command-line arguments only
Unknown program 'wikipediaXMLSplitter' chosen.

推荐答案

我遇到了同样的问题.通过指定org.apache.mahout.text.wikipedia.WikipediaXmlSplitter来解决此问题(另请注意大小写)

I've run into the same problem. It is solved by specifying org.apache.mahout.text.wikipedia.WikipediaXmlSplitter [note also the different capitalization]

$ MAHOUT_HOME/bin/mahout org.apache.mahout.text.wikipedia.WikipediaXmlSplitter -d $ MAHOUT_HOME/examples/tmp/enw​​iki-latest-pages-articles.xml -o Wikipedia/chunks

$MAHOUT_HOME/bin/mahout org.apache.mahout.text.wikipedia.WikipediaXmlSplitter -d $MAHOUT_HOME/examples/tmp/enwiki-latest-pages-articles.xml -o wikipedia/chunks

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