java - 在将 mahout 与 map reduce 程序集成时，我在解析 XML 时遇到此错误

Question

运行程序时出现以下错误。任何的想法？

Caused by: java.lang.NoClassDefFoundError: com/google/common/base/Charsets
            at org.apache.mahout.text.wikipedia.XmlInputFormat$XmlRecordReader.<init>(XmlInputFormat.java:76)
            at org.apache.mahout.text.wikipedia.XmlInputFormat.createRecordReader(XmlInputFormat.java:52)
            at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.<init>(MapTask.java:488)
            at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:731)
            at org.apache.hadoop.mapred.MapTask.run(MapTask.java:364)
            at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:223)
            at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
            at java.util.concurrent.FutureTask.run(Unknown Source)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
            at java.lang.Thread.run(Unknown Source)
        Caused by: java.lang.ClassNotFoundException: com.google.common.base.Charsets
            at java.net.URLClassLoader$1.run(Unknown Source)
            at java.net.URLClassLoader$1.run(Unknown Source)
            at java.security.AccessController.doPrivileged(Native Method)
            at java.net.URLClassLoader.findClass(Unknown Source)
            at java.lang.ClassLoader.loadClass(Unknown Source)
            at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
            at java.lang.ClassLoader.loadClass(Unknown Source)*

Answer 1

在包下找不到类。尝试提取 jar 文件并遍历到 com/google/common/base 包。我认为类丢失了。使用另一个具有 Charsets 类

的 jar 文件