近期准备開始学习Hadoop1.2.1的源码，感觉最好的方法还是能够在运行Hadoop及hadoop作业时跟踪调试代码的实际运行情况。因为选择的IDE为eclipse，所以准备编译一下hadoop的eclipse插件，以下就直接进入正题。Hadoop的eclipse插件源码位于hadoop-1.2.1/src/contrib/eclipse-plugin/中，直接进入该文件夹，在不做不论什么改动的情况下，在命令行输入ant，运行效果例如以下：

[hadoop@hadoop eclipse-plugin]$ ant

Buildfile: /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml

check-contrib:

     [echo] eclipse.home unset: skipping eclipse plugin

init:

ivy-download:

      [get] Getting: http://repo2.maven.org/maven2/org/apache/ivy/ivy/2.1.0/ivy-2.1.0.jar

      [get] To: /home/hadoop/hadoop-1.2.1/ivy/ivy-2.1.0.jar

      [get] Not modified - so not downloaded

ivy-probe-antlib:

ivy-init-antlib:

ivy-init:

[ivy:configure] :: Ivy 2.1.0 - 20090925235825 :: http://ant.apache.org/ivy/ ::

[ivy:configure] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xml

ivy-resolve-common:

[ivy:resolve]

[ivy:resolve] :: problems summary ::

[ivy:resolve] :::: WARNINGS

[ivy:resolve] 		module not found: commons-logging#commons-logging;1.0.4

[ivy:resolve] 	==== local: tried

[ivy:resolve] 	  /home/hadoop/.ivy2/local/commons-logging/commons-logging/1.0.4/ivys/ivy.xml

[ivy:resolve] 	  -- artifact commons-logging#commons-logging;1.0.4!commons-logging.jar:

[ivy:resolve] 	  /home/hadoop/.ivy2/local/commons-logging/commons-logging/1.0.4/jars/commons-logging.jar

[ivy:resolve] 	==== maven2: tried

[ivy:resolve] 	  http://repo1.maven.org/maven2/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.pom

[ivy:resolve] 	  -- artifact commons-logging#commons-logging;1.0.4!commons-logging.jar:

[ivy:resolve] 	  http://repo1.maven.org/maven2/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.jar

[ivy:resolve] 	==== oss-sonatype: tried

[ivy:resolve] 	  https://oss.sonatype.org/content/groups/public/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.pom

[ivy:resolve] 	  -- artifact commons-logging#commons-logging;1.0.4!commons-logging.jar:

[ivy:resolve] 	  https://oss.sonatype.org/content/groups/public/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.jar

[ivy:resolve] 		::::::::::::::::::::::::::::::::::::::::::::::

[ivy:resolve] 		::          UNRESOLVED DEPENDENCIES         ::

[ivy:resolve] 		::::::::::::::::::::::::::::::::::::::::::::::

[ivy:resolve] 		:: commons-logging#commons-logging;1.0.4: not found

[ivy:resolve] 		::::::::::::::::::::::::::::::::::::::::::::::

[ivy:resolve] :::: ERRORS

[ivy:resolve] 	SERVER ERROR: Gateway Timeout url=http://repo1.maven.org/maven2/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.pom

[ivy:resolve] 	SERVER ERROR: Gateway Timeout url=http://repo1.maven.org/maven2/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.jar

[ivy:resolve] 	SERVER ERROR: Gateway Timeout url=http://repo1.maven.org/maven2/log4j/log4j/1.2.15/log4j-1.2.15.jar

[ivy:resolve]

[ivy:resolve] :: USE VERBOSE OR DEBUG MESSAGE LEVEL FOR MORE DETAILS

BUILD FAILED

/home/hadoop/hadoop-1.2.1/src/contrib/build-contrib.xml:492: impossible to resolve dependencies:

	resolve failed - see output for details

Total time: 2 minutes 25 seconds

依据错误信息，能够将错误的根源定位到hadoop-1.2.1/src/contrib/ eclipse-plugin/ ivy.xml中的29行rev="${commons-logging.version}"。该值能够在hadoop-1.2.1/ivy/libraries.properties中找到，其原值为1.0.4，改为commons-logging.version=1.1.1就可以。同一时候该输出信息还提示了[echo] eclipse.homeunset: skipping eclipse plugin。此信息提示变量eclipse.home未设置。而该变量在编译插件时是必须的。所以在hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml中加入eclipse的安装文件夹，加入例如以下代码：<propertyname="eclipse.home"
value="/home/hadoop/eclipse"/>，该变量的值依据eclipse的实际安装文件夹而定。改动完成后，再次在命令行中输入ant命令，结果例如以下：

 [hadoop@hadoop eclipse-plugin]$ ant

Buildfile: /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml

check-contrib:

init:

     [echo] contrib: eclipse-plugin

init-contrib:

ivy-download:

      [get] Getting: http://repo2.maven.org/maven2/org/apache/ivy/ivy/2.1.0/ivy-2.1.0.jar

      [get] To: /home/hadoop/hadoop-1.2.1/ivy/ivy-2.1.0.jar

      [get] Not modified - so not downloaded

ivy-probe-antlib:

ivy-init-antlib:

ivy-init:

[ivy:configure] :: Ivy 2.1.0 - 20090925235825 :: http://ant.apache.org/ivy/ ::

[ivy:configure] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xml

ivy-resolve-common:

ivy-retrieve-common:

[ivy:cachepath] DEPRECATED: 'ivy.conf.file' is deprecated, use 'ivy.settings.file' instead

[ivy:cachepath] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xml

compile:

     [echo] contrib: eclipse-plugin

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:61: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds

    [javac] Compiling 45 source files to /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/classes

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:28: 软件包 org.apache.hadoop.fs 不存在

    [javac] import org.apache.hadoop.fs.FileStatus;

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:29: 软件包 org.apache.hadoop.fs 不存在

    [javac] import org.apache.hadoop.fs.Path;

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:25: 软件包 org.apache.hadoop.hdfs 不存在

    [javac] import org.apache.hadoop.hdfs.DistributedFileSystem;

    [javac]                              ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:29: 软件包 org.apache.hadoop.fs 不存在

    [javac] import org.apache.hadoop.fs.FileSystem;

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:30: 软件包 org.apache.hadoop.fs 不存在

    [javac] import org.apache.hadoop.fs.Path;

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:36: 软件包 org.apache.hadoop.conf 不存在

    [javac] import org.apache.hadoop.conf.Configuration;

    [javac]                              ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:38: 软件包 org.apache.hadoop.fs 不存在

    [javac] import org.apache.hadoop.fs.FileSystem;

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:39: 软件包 org.apache.hadoop.io 不存在

    [javac] import org.apache.hadoop.io.IOUtils;

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:40: 软件包 org.apache.hadoop.mapred 不存在

    [javac] import org.apache.hadoop.mapred.JobClient;

    [javac]                                ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:41: 软件包 org.apache.hadoop.mapred 不存在

    [javac] import org.apache.hadoop.mapred.JobConf;

    [javac]                                ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:42: 软件包 org.apache.hadoop.mapred 不存在

    [javac] import org.apache.hadoop.mapred.JobID;

    [javac]                                ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:43: 软件包 org.apache.hadoop.mapred 不存在

    [javac] import org.apache.hadoop.mapred.JobStatus;

    [javac]                                ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:44: 软件包 org.apache.hadoop.mapred 不存在

    [javac] import org.apache.hadoop.mapred.RunningJob;

    [javac]                                ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:54: 找不到符号

    [javac] 符号： 类 Path

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder

    [javac]   private DFSFolder(DFSPath parent, Path path) {

    [javac]                                     ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:43: 找不到符号

    [javac] 符号： 类 DistributedFileSystem

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath

    [javac]   private DistributedFileSystem dfs = null;

    [javac]           ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:45: 找不到符号

    [javac] 符号： 类 Path

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath

    [javac]   protected final Path path;

    [javac]                   ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:76: 找不到符号

    [javac] 符号： 类 Path

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath

    [javac]   protected DFSPath(DFSPath parent, Path path) {

    [javac]                                     ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:134: 找不到符号

    [javac] 符号： 类 Path

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath

    [javac]   public Path getPath() {

    [javac]          ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:144: 找不到符号

    [javac] 符号： 类 DistributedFileSystem

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath

    [javac]   DistributedFileSystem getDFS() throws IOException {

    [javac]   ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSLocationsRoot.java:28: 软件包 org.apache.hadoop.fs 不存在

    [javac] import org.apache.hadoop.fs.FileSystem;

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:199: 找不到符号

    [javac] 符号： 类 Configuration

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]   private Configuration conf;

    [javac]           ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:209: 找不到符号

    [javac] 符号： 类 JobID

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]   private transient Map<JobID, HadoopJob> runningJobs =

    [javac]                         ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:24: 软件包 org.apache.hadoop.fs 不存在

    [javac] import org.apache.hadoop.fs.FileSystem;

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:25: 软件包 org.apache.hadoop.fs 不存在

    [javac] import org.apache.hadoop.fs.FileUtil;

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:26: 软件包 org.apache.hadoop.fs 不存在

    [javac] import org.apache.hadoop.fs.Path;

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:27: 软件包 org.apache.hadoop.mapred 不存在

    [javac] import org.apache.hadoop.mapred.Counters;

    [javac]                                ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:28: 软件包 org.apache.hadoop.mapred 不存在

    [javac] import org.apache.hadoop.mapred.JobConf;

    [javac]                                ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:29: 软件包 org.apache.hadoop.mapred 不存在

    [javac] import org.apache.hadoop.mapred.JobID;

    [javac]                                ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:30: 软件包 org.apache.hadoop.mapred 不存在

    [javac] import org.apache.hadoop.mapred.JobStatus;

    [javac]                                ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:31: 软件包 org.apache.hadoop.mapred 不存在

    [javac] import org.apache.hadoop.mapred.RunningJob;

    [javac]                                ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:291: 找不到符号

    [javac] 符号： 类 Configuration

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]   public Configuration getConfiguration() {

    [javac]          ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/ConfProp.java:24: 软件包 org.apache.hadoop.conf 不存在

    [javac] import org.apache.hadoop.conf.Configuration;

    [javac]                              ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:468: 找不到符号

    [javac] 符号： 类 FileSystem

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]   public FileSystem getDFS() throws IOException {

    [javac]          ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:477: 找不到符号

    [javac] 符号： 类 JobClient

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]   public JobClient getJobClient() throws IOException {

    [javac]          ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:76: 找不到符号

    [javac] 符号： 类 JobID

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]   final JobID jobId;

    [javac]         ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:82: 找不到符号

    [javac] 符号： 类 RunningJob

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]   RunningJob running;

    [javac]   ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:89: 找不到符号

    [javac] 符号： 类 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]   JobStatus status;

    [javac]   ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:94: 找不到符号

    [javac] 符号： 类 Counters

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]   Counters counters;

    [javac]   ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:99: 找不到符号

    [javac] 符号： 类 JobConf

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]   JobConf jobConf = null;

    [javac]   ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:127: 找不到符号

    [javac] 符号： 类 JobID

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]   public HadoopJob(HadoopServer location, JobID id, RunningJob running,

    [javac]                                           ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:127: 找不到符号

    [javac] 符号： 类 RunningJob

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]   public HadoopJob(HadoopServer location, JobID id, RunningJob running,

    [javac]                                                     ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:128: 找不到符号

    [javac] 符号： 类 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]       JobStatus status) {

    [javac]       ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:215: 找不到符号

    [javac] 符号： 类 JobID

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]   public JobID getJobID() {

    [javac]          ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:278: 找不到符号

    [javac] 符号： 类 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]   void update(JobStatus status) {

    [javac]               ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:88: 找不到符号

    [javac] 符号： 类 JobClient

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater

    [javac]     JobClient client = null;

    [javac]     ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:181: 找不到符号

    [javac] 符号： 类 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater

    [javac]     private void updateJob(final HadoopJob job, JobStatus status) {

    [javac]                                                 ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/ConfProp.java:138: 找不到符号

    [javac] 符号： 类 Configuration

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.ConfProp

    [javac]   String get(Configuration conf) {

    [javac]              ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/ConfProp.java:142: 找不到符号

    [javac] 符号： 类 Configuration

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.ConfProp

    [javac]   void set(Configuration conf, String value) {

    [javac]            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFile.java:34: 软件包 org.apache.hadoop.fs 不存在

    [javac] import org.apache.hadoop.fs.FileStatus;

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFile.java:35: 软件包 org.apache.hadoop.fs 不存在

    [javac] import org.apache.hadoop.fs.Path;

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFile.java:63: 找不到符号

    [javac] 符号： 类 Path

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFile

    [javac]   public DFSFile(DFSPath parent, Path path, File file,

    [javac]                                  ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFile.java:70: 找不到符号

    [javac] 符号： 类 Path

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFile

    [javac]   public DFSFile(DFSPath parent, Path path) {

    [javac]                                  ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/servers/HadoopLocationWizard.java:31: 软件包 org.apache.hadoop.conf 不存在

    [javac] import org.apache.hadoop.conf.Configuration;

    [javac]                              ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/servers/RunOnHadoopWizard.java:31: 软件包 org.apache.hadoop.io 不存在

    [javac] import org.apache.hadoop.io.IOUtils;

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/servers/RunOnHadoopWizard.java:32: 软件包 org.apache.hadoop.mapred 不存在

    [javac] import org.apache.hadoop.mapred.JobConf;

    [javac]                                ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/servers/ServerRegistry.java:31: 软件包 org.apache.hadoop.conf 不存在

    [javac] import org.apache.hadoop.conf.Configuration;

    [javac]                              ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:66: 找不到符号

    [javac] 符号： 类 Path

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath

    [javac]     this.path = new Path("/");

    [javac]                     ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:146: 找不到符号

    [javac] 符号： 类 FileSystem

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath

    [javac]       FileSystem fs = location.getDFS();

    [javac]       ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:147: 找不到符号

    [javac] 符号： 类 DistributedFileSystem

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath

    [javac]       if (!(fs instanceof DistributedFileSystem)) {

    [javac]                           ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:153: 找不到符号

    [javac] 符号： 类 DistributedFileSystem

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath

    [javac]       this.dfs = (DistributedFileSystem) fs;

    [javac]                   ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:61: 找不到符号

    [javac] 符号： 类 FileStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder

    [javac]     for (FileStatus status : getDFS().listStatus(this.getPath())) {

    [javac]          ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:82: 找不到符号

    [javac] 符号： 类 Path

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder

    [javac]       Path filePath = new Path(this.path, file.getName());

    [javac]       ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:82: 找不到符号

    [javac] 符号： 类 Path

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder

    [javac]       Path filePath = new Path(this.path, file.getName());

    [javac]                           ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:93: 找不到符号

    [javac] 符号： 类 Path

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder

    [javac]       Path filePath = new Path(this.path, file.getName());

    [javac]       ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:93: 找不到符号

    [javac] 符号： 类 Path

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder

    [javac]       Path filePath = new Path(this.path, file.getName());

    [javac]                           ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:152: 找不到符号

    [javac] 符号： 类 Path

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder

    [javac]       getDFS().mkdirs(new Path(this.path, folderName));

    [javac]                           ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:116: 找不到符号

    [javac] 符号： 类 JobID

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater

    [javac]         Set<JobID> missingJobIds =

    [javac]             ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:117: 找不到符号

    [javac] 符号： 类 JobID

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater

    [javac]             new HashSet<JobID>(runningJobs.keySet());

    [javac]                         ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:119: 找不到符号

    [javac] 符号： 类 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater

    [javac]         JobStatus[] jstatus = client.jobsToComplete();

    [javac]         ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:120: 找不到符号

    [javac] 符号： 类 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater

    [javac]         for (JobStatus status : jstatus) {

    [javac]              ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:122: 找不到符号

    [javac] 符号： 类 JobID

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater

    [javac]           JobID jobId = status.getJobID();

    [javac]           ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:130: 找不到符号

    [javac] 符号： 类 RunningJob

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater

    [javac]               RunningJob running = client.getJob(jobId);

    [javac]               ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:142: 找不到符号

    [javac] 符号： 类 JobID

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater

    [javac]         for (JobID jobId : missingJobIds) {

    [javac]              ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:210: 找不到符号

    [javac] 符号： 类 JobID

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]       Collections.synchronizedMap(new TreeMap<JobID, HadoopJob>());

    [javac]                                               ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:224: 找不到符号

    [javac] 符号： 类 Configuration

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]     this.conf = new Configuration();

    [javac]                     ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:238: 找不到符号

    [javac] 符号： 类 Configuration

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]     this.conf = new Configuration();

    [javac]                     ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:338: 找不到符号

    [javac] 符号： 类 Configuration

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]     this.conf = new Configuration(existing.conf);

    [javac]                     ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:354: 找不到符号

    [javac] 符号： 类 Configuration

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]     Configuration newConf = new Configuration(this.conf);

    [javac]     ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:354: 找不到符号

    [javac] 符号： 类 Configuration

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]     Configuration newConf = new Configuration(this.conf);

    [javac]                                 ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:429: 找不到符号

    [javac] 符号： 变量 IOUtils

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]       IOUtils.closeStream(fos);

    [javac]       ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:469: 找不到符号

    [javac] 符号： 变量 FileSystem

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]     return FileSystem.get(this.conf);

    [javac]            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:478: 找不到符号

    [javac] 符号： 类 JobConf

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]     JobConf jconf = new JobConf(this.conf);

    [javac]     ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:478: 找不到符号

    [javac] 符号： 类 JobConf

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]     JobConf jconf = new JobConf(this.conf);

    [javac]                         ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:479: 找不到符号

    [javac] 符号： 类 JobClient

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer

    [javac]     return new JobClient(jconf);

    [javac]                ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSLocationsRoot.java:131: 找不到符号

    [javac] 符号： 变量 FileSystem

    [javac]           FileSystem.closeAll();

    [javac]           ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:43: 找不到符号

    [javac] 符号： 变量 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState

    [javac]     PREPARE(JobStatus.PREP), RUNNING(JobStatus.RUNNING), FAILED(

    [javac]             ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:43: 找不到符号

    [javac] 符号： 变量 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState

    [javac]     PREPARE(JobStatus.PREP), RUNNING(JobStatus.RUNNING), FAILED(

    [javac]                                      ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:44: 找不到符号

    [javac] 符号： 变量 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState

    [javac]         JobStatus.FAILED), SUCCEEDED(JobStatus.SUCCEEDED);

    [javac]         ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:44: 找不到符号

    [javac] 符号： 变量 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState

    [javac]         JobStatus.FAILED), SUCCEEDED(JobStatus.SUCCEEDED);

    [javac]                                      ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:54: 找不到符号

    [javac] 符号： 变量 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState

    [javac]         case JobStatus.PREP:

    [javac]              ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:56: 找不到符号

    [javac] 符号： 变量 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState

    [javac]         case JobStatus.RUNNING:

    [javac]              ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:58: 找不到符号

    [javac] 符号： 变量 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState

    [javac]         case JobStatus.FAILED:

    [javac]              ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:60: 找不到符号

    [javac] 符号： 变量 JobStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState

    [javac]         case JobStatus.SUCCEEDED:

    [javac]              ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:146: 找不到符号

    [javac] 符号： 类 FileSystem

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]       FileSystem fs = location.getDFS();

    [javac]       ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:148: 找不到符号

    [javac] 符号： 类 Path

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]       if (FileUtil.copy(fs, new Path(jobFile), tmp, false, location

    [javac]                                 ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:148: 找不到符号

    [javac] 符号： 变量 FileUtil

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]       if (FileUtil.copy(fs, new Path(jobFile), tmp, false, location

    [javac]           ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:150: 找不到符号

    [javac] 符号： 类 JobConf

    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob

    [javac]         this.jobConf = new JobConf(tmp.toString());

    [javac]                            ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:302: 软件包 Counters 不存在

    [javac]       Counters.Group group = counters.getGroup(groupName);

    [javac]               ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:305: 软件包 Counters 不存在

    [javac]       for (Counters.Counter counter : group) {

    [javac]                    ^

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFile.java:74: 找不到符号

    [javac] 符号： 类 FileStatus

    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFile

    [javac]       FileStatus fs = getDFS().getFileStatus(path);

    [javac]       ^

    [javac] 注意：某些输入文件使用或覆盖了已过时的 API。

[javac] 注意：要了解具体信息，请使用 -Xlint:deprecation 又一次编译。

    [javac] 注意：某些输入文件使用了未经检查或不安全的操作。

[javac] 注意：要了解具体信息，请使用 -Xlint:unchecked 又一次编译。

    [javac] 100 错误

BUILD FAILED

/home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:61: Compile failed; see the compiler error output for details.

Total time: 12 seconds

由错误信息可知，classpath中没有包括hadoop对应的jar包。解决方法为在hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml中加入以下的代码：

 <path>

         <filesetdir="${hadoop.root}">

           <include name="hadoop*.jar"/>

         </fileset>

    </path>

同一时候将hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml中的<copyfile="${hadoop.root}/build/hadoop-core-${version}.jar" tofile="${build.dir}/lib/hadoop-core.jar"verbose="true"/>为<copy file="${hadoop.root}/hadoop-core-${version}.jar"tofile="${build.dir}/lib/hadoop-core.jar"verbose="true"/>，做完这些改动后，再次运行ant命令：

[hadoop@hadoop eclipse-plugin]$ ant

Buildfile: /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml

check-contrib:

init:

     [echo] contrib: eclipse-plugin

init-contrib:

ivy-download:

      [get] Getting: http://repo2.maven.org/maven2/org/apache/ivy/ivy/2.1.0/ivy-2.1.0.jar

      [get] To: /home/hadoop/hadoop-1.2.1/ivy/ivy-2.1.0.jar

      [get] Not modified - so not downloaded

ivy-probe-antlib:

ivy-init-antlib:

ivy-init:

[ivy:configure] :: Ivy 2.1.0 - 20090925235825 :: http://ant.apache.org/ivy/ ::

[ivy:configure] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xml

ivy-resolve-common:

ivy-retrieve-common:

[ivy:cachepath] DEPRECATED: 'ivy.conf.file' is deprecated, use 'ivy.settings.file' instead

[ivy:cachepath] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xml

compile:

     [echo] contrib: eclipse-plugin

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:66: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds

    [javac] Compiling 45 source files to /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/classes

    [javac] 注意：某些输入文件使用或覆盖了已过时的 API。

[javac] 注意：要了解具体信息，请使用 -Xlint:deprecation 又一次编译。

[javac] 注意：某些输入文件使用了未经检查或不安全的操作。

    [javac] 注意：要了解具体信息。请使用 -Xlint:unchecked 又一次编译。

jar:

    [mkdir] Created dir: /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/lib

BUILD FAILED

/home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:74: Warning: Could not find file /home/hadoop/hadoop-1.2.1/hadoop-core-${version}.jar to copy.

Total time: 8 seconds

这次编译失败的原因是找不到hadoop-core-${version}.jar，也就是变量${version}没有定义，事实上在/hadoop-1.2.1/ivy/libraries.properties中定义了hadoop.version=1.2.1而不是version变量，或者将version替换为hadoop.version。或者在build.xml加入变量version，此次编译过程中选择后者<property name="version" value="1.2.1"/>，再次运行ant：

 [hadoop@hadoop eclipse-plugin]$ ant

Buildfile: /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml

check-contrib:

init:

     [echo] contrib: eclipse-plugin

init-contrib:

ivy-download:

      [get] Getting: http://repo2.maven.org/maven2/org/apache/ivy/ivy/2.1.0/ivy-2.1.0.jar

      [get] To: /home/hadoop/hadoop-1.2.1/ivy/ivy-2.1.0.jar

      [get] Not modified - so not downloaded

ivy-probe-antlib:

ivy-init-antlib:

ivy-init:

[ivy:configure] :: Ivy 2.1.0 - 20090925235825 :: http://ant.apache.org/ivy/ ::

[ivy:configure] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xml

ivy-resolve-common:

ivy-retrieve-common:

[ivy:cachepath] DEPRECATED: 'ivy.conf.file' is deprecated, use 'ivy.settings.file' instead

[ivy:cachepath] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xml

compile:

     [echo] contrib: eclipse-plugin

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:67: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds

jar:

     [copy] Copying 1 file to /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/lib

     [copy] Copying /home/hadoop/hadoop-1.2.1/hadoop-core-1.2.1.jar to /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/lib/hadoop-core.jar

BUILD FAILED

/home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:76: Warning: Could not find file /home/hadoop/hadoop-1.2.1/build/ivy/lib/Hadoop/common/commons-cli-1.2.jar to copy.

Total time: 17 seconds

失败原因是找不到commons-cli-1.2.jar。

修复方法是改动build.xml文件，将<copy file="${hadoop.root}/build/ivy/lib/Hadoop/common/commons-cli-${commons-cli.version}.jar"  todir="${build.dir}/lib"verbose="true"/>改动为<copyfile="${hadoop.root}/lib/commons-cli-${commons-cli.version}.jar" 
todir="${build.dir}/lib"verbose="true"/>，再次运行ant：

[hadoop@hadoop eclipse-plugin]$ ant

Buildfile: /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/ build.xml

check-contrib:

init:

     [echo] contrib: eclipse-plugin

init-contrib:

ivy-download:

      [get] Getting: http://repo2.maven.org/maven2/org/apache/ivy/ivy/2.1.0/ivy-2.1.0.jar

      [get] To: /home/hadoop/hadoop-1.2.1/ivy/ivy-2.1.0.jar

      [get] Not modified - so not downloaded

ivy-probe-antlib:

ivy-init-antlib:

ivy-init:

[ivy:configure] :: Ivy 2.1.0 - 20090925235825 :: http://ant.apache.org/ivy/ ::

[ivy:configure] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xml

ivy-resolve-common:

ivy-retrieve-common:

[ivy:cachepath] DEPRECATED: 'ivy.conf.file' is deprecated, use 'ivy.settings.file' instead

[ivy:cachepath] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xml

compile:

     [echo] contrib: eclipse-plugin

    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:67: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds

jar:

     [copy] Copying 1 file to /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/lib

     [copy] Copying /home/hadoop/hadoop-1.2.1/lib/commons-cli-1.2.jar to /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/lib/commons-cli-1.2.jar

      [jar] Building jar: /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/hadoop-eclipse-plugin-1.2.1.jar

BUILD SUCCESSFUL

Total time: 10 seconds

至此编译hadoop的eclipse插件成功完毕。接下来试试能否够正常工作，将编译成功的hadoop-1.2.1/build/contrib/eclipse-plugin/hadoop-eclipse-plugin-1.2.1.jar文件复制到eclipse下的plugins文件夹中，然后启动eclipse，在File菜单下选择New子菜单下的Other，弹出以下的窗体。能够发现已经有了Map/Reduce，说明插件已经生效。

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