我正在嘗試從「hadoop in action」一書中將一系列文件從本地文件系統合併到hdfs中的一個文件中的一個簡單程序。代碼片段與本書中提供的代碼片段相同。獲取ClassNotFound異常：在Hadoop中轉儲配置時
import java.lang.*;
import java.util.*;
import java.io.*;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;
public class PutMerge {
public static void main(String[] args) throws IOException{
Configuration conf = new Configuration();
FileSystem hdfs = FileSystem.get(conf);
FileSystem local = FileSystem.getLocal(conf);
Path inputDir = new Path(args[0]); // First argument has the input directory
Path hdfsFile = new Path(args[1]); // Concatenated hdfs file name
try {
FileStatus[] inputFiles = local.listStatus(inputDir); // list of Local Files
FSDataOutputStream out = hdfs.create(hdfsFile); // target file creation
for (int i = 0; i<inputFiles.size; i++ {
FSDataInputStream in = local.open(inputFiles[i].getPath());
int bytesRead = 0;
byte[] buff = new byte[256];
while (bytesRead = (in.read(buff))>0) {
out.write(buff,0,bytesRead);
}
in.close();
}
out.close();
}
catch(Exception e) {
e.printStackTrace();
}
}
}
成功編譯程序，並試圖運行我得到以下異常基於從一些職位的投入
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/configuration/Configuration at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.(DefaultMetricsSystem.java:37) at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.(DefaultMetricsSystem.java:34) at org.apache.hadoop.security.UgiInstrumentation.create(UgiInstrumentation.java:51) at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:217) at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:185) at org.apache.hadoop.security.UserGroupInformation.isSecurityEnabled(UserGroupInformation.java:237) at org.apache.hadoop.security.KerberosName.(KerberosName.java:79) at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:210) at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:185) at org.apache.hadoop.security.UserGroupInformation.isSecurityEnabled(UserGroupInformation.java:237) at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:482) at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:468) at org.apache.hadoop.fs.FileSystem$Cache$Key.(FileSystem.java:1519) at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1420) at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:254) at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:123) at PutMerge.main(PutMerge.java:16) Caused by: java.lang.ClassNotFoundException: org.apache.commons.configuration.Configuration at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:423) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:356) ... 17 more
，我增加了公共包。我的類路徑定義是
/usr/java/jdk1.7.0_21:/data/commons-logging-1.1.2/commons-logging-1.1.2.jar:/data/hadoop-1.1.2/hadoop-core-1.1.2.jar:/data/commons-logging-1.1.2/commons-logging-adapters-1.1.2.jar:/data/commons-logging-1.1.2/commons-logging-api-1.1.2.jar:.
任何線索爲什麼這不工作？