在编译hadoop程序的情况下连接到log4j时出错答案

【问题标题】：Error connected to log4j in case of compilation of the hadoop program在编译hadoop程序的情况下连接到log4j时出错
【发布时间】：2013-04-19 16:59:53
【问题描述】：

我使用 log4j 编写了 hadoop 程序，并给出了它的部分

package org.myorg;

import java.io.*;
import java.util.*;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.conf.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.mapred.*;
import org.apache.hadoop.util.*;
import org.apache.log4j.Logger;
import org.apache.logging.log4j.LogManager;
import org.apache.log4j.xml.DOMConfigurator;

public class ParallelIndexation {
    //public static native long Traveser(String Path);

    //public static native void Configure(String Path);

    //static {
    //  System.loadLibrary("nativelib");
    //}
    public static class Map extends MapReduceBase implements
            Mapper<LongWritable, Text, Text, LongWritable> {
        private final static LongWritable zero = new LongWritable(0);
        private Text word = new Text();
        private static final Logger logger = LogManager.getLogger(Map.class.getName());
        DOMConfigurator.configure("/export/hadoop-1.0.1/log4j.xml");

我尝试通过命令编译hadoop程序

root@one:/opt/jdk1.7.0_06/bin#. / javac - classpath/export/hadoop-1.0.1/hadoop-core-1.0.1.jar:/export/hadoop-1.0.1/log4j-1.2.17.jar - d/folder/classes/folder/src/ParallelIndexation.java

我也因此收到以下错误消息

/folder/src/ParallelIndexation.java:27: error: <identifier> expected
        DOMConfigurator.configure("/export/hadoop-1.0.1/log4j.xml");
                                 ^
/folder/src/ParallelIndexation.java:27: error: illegal start of type
        DOMConfigurator.configure("/export/hadoop-1.0.1/log4j.xml");
                                  ^
2 errors

帮助消除这些错误。

【问题讨论】：

标签： java linux hadoop compilation log4j

【解决方案1】：

声明

DOMConfigurator.configure("/export/hadoop-1.0.1/log4j.xml");

应该在方法中（或构造函数或static初始化器）

而不是在Map的类块中

【讨论】：