无法为Hadoop编译MaxTemperatureMapper.java示例：包org.apache.Hadoop.MapReduce不存在

Question

我已经尝试了很长一段时间在我学校的实验室计算机上编译这本书中的第一个示例，用javac使用HADOOP_CLASSPATH变量和-classpath标志，但没有成功。以下是我仍然收到的错误消息：

javac-verbose-classpath

[解析已启动RegularFileObject[MaxTemperatureMapper.java]][解析已完成13ms][源文件搜索路径：/home/2013/RBOKSE/downloads/Hadoop/Share/Hadoop/Common/Hadoop-Common-2.0.4-alpha.jar,~/downloads/Hadoop/Share/Hadoop/MapReduce/Hadoop-MapReduce-Client-App-2.0.4-alpha.jar,

[类文件的搜索路径：/usr/lib/jvm/java-7-openjdk-i386/jre/lib/resources.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/rt.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/sunrsasign.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/jsse.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/jce.jar,ipfs.jar,/home/2013/rbokse/downloads/hadoop/share/hadoop/common/hadoop-common-2.0.4-alpha.jar,~/downloads/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-app-2.0.4-alpha.jar,~/downloads/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-client-app-2.0.4-alpha.jar,

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/java-7-openjdk-i386/lib/ct.sym（meta-inf/sym/rt.jar/java/io/ioException.class)]]

[正在加载ZipFileIndexFileObject[/Home/2013/Rbokse/Downloads/Hadoop/Share/Hadoop/Common/Hadoop-Common-2.0.4-alpha.jar（org/Apache/Hadoop/Io/intWritable.class)]][正在加载ZipFileIndexFileObject[/Home/2013/Rbokse/Downloads/Hadoop/Share/Hadoop/Common/Hadoop-Common-2.0.4-alpha.jar（org/Apache/Hadoop/Io/LongWritable.

[正在加载ZipFileIndexFileObject[/home/2013/rbokse/downloads/hadoop/share/hadoop/common/hadoop-common-2.0.4-alpha.jar（org/apache/hadoop/io/text.class)]]MaxTemperatureMapper.java：8：错误：包org.apache.hadoop.mapReduce不存在导入org.apache.hadoop.mapReduce.mapper；^MaxTemperatureMapper.java:11:错误：找不到符号扩展映射器{^symbol:class Mapper MaxTemperatureMapper.java:16:错误：找不到符号public void map（可长写键、文本值、Context上下文）^symbol:class上下文位置：class MaxTemperatureMapper

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/java-7-openjdk-i386/lib/ct.sym（meta-inf/sym/rt.jar/java/lang/interruptedexception.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/java-7-openjdk-i386/lib/ct.sym（meta-inf/sym/rt.jar/java/lang/override.class)]]

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/java-7-openjdk-i386/lib/ct.sym（meta-inf/sym/rt.jar/java/lang/object.class)]]...

[正在加载ZipFileIndexFileObject[/usr/lib/jvm/java-7-openjdk-i386/lib/ct.sym（meta-inf/sym/rt.jar/java/lang/number.class)]]MaxTemperatureMapper.java:15:Error：方法不重写或实现超级类型@override中的方法^[总计170ms]4错误

如有任何帮助，将不胜感激。