用Ant编译eclipse hadoop plugin插件

网上讲的用Ant编译eclipse hadoop plugin插件，都讲的很复杂，对于我这样的菜鸟哪里经得起这么多折腾，本人经过实践，写出我的编译经验
首先安装eclipse,记住eclipse版本一定要3.3+，笔者就犯过这样的错误，我开始用3.2版本编译总是提示jar包找不到，纠结了很久，最后去官网看了说明才明白，所一建议大家多看官方文档。，本次编译环境如下：

ubuntu12
ant 1.9.1

eclipse 3.6
hadoop 1.1.2

首先请预先安装ant并设置环境变量，下载hadoop-1.1.2.tar.gz源码解压

修改${hadoop.root}/src/contrib目录的build-contrib.xml文件，添加eclipse路径和hadoop版本信息

<property name="eclipse.home" location="/usr/local/eclipse3.6" />  
  <property name="version" value="1.1.2"/>

修改${hadoop.root}/src/contrib/eclipse-plugin目录下的build.xml文件，在id为classpath的path节点添加hadoop-core的jar依赖

<!-- Override classpath to include Eclipse SDK jars -->
  <path id="classpath">
    <pathelement location="${build.classes}"/>
    <pathelement location="${hadoop.root}/build/classes"/>    
    <!--hadoop-core -->    
    <pathelement location="${hadoop.root}/hadoop-core-1.1.2.jar"/>
    <path refid="eclipse-sdk-jars"/>
  </path>

找到name为jar的target，将相应的jar文件打包进插件的lib目录

<!-- Override jar target to specify manifest -->
  <target name="jar" depends="compile" unless="skip.contrib">
    <mkdir dir="${build.dir}/lib"/>
    <!--<copy file="${hadoop.root}/build/hadoop-core-${version}.jar" tofile="${build.dir}/lib/hadoop-core.jar" verbose="true"/>
    <copy file="${hadoop.root}/build/ivy/lib/Hadoop/common/commons-cli-${commons-cli.version}.jar"  todir="${build.dir}/lib" verbose="true"/>-->
    <copy file="${hadoop.root}/hadoop-core-${version}.jar" tofile="${build.dir}/lib/hadoop-core.jar" verbose="true"/>
    <copy file="${hadoop.root}/lib/commons-cli-${commons-cli.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <!-- 将以下jar包打进hadoop-eclipse-1.1.2.jar中 -->     
    <copy file="${hadoop.root}/lib/commons-lang-2.4.jar"  todir="${build.dir}/lib" verbose="true"/>  
    <copy file="${hadoop.root}/lib/commons-configuration-1.6.jar"  todir="${build.dir}/lib" verbose="true"/>  
    <copy file="${hadoop.root}/lib/jackson-mapper-asl-1.8.8.jar"  todir="${build.dir}/lib" verbose="true"/>  
    <copy file="${hadoop.root}/lib/jackson-core-asl-1.8.8.jar"  todir="${build.dir}/lib" verbose="true"/>  
    <copy file="${hadoop.root}/lib/commons-httpclient-3.0.1.jar"  todir="${build.dir}/lib" verbose="true"/>  
    <jar
      jarfile="${build.dir}/hadoop-${name}-${version}.jar"
      manifest="${root}/META-INF/MANIFEST.MF">
      <fileset dir="${build.dir}" includes="classes/ lib/"/>
      <fileset dir="${root}" includes="resources/ plugin.xml"/>
    </jar>
  </target>

修改MANIFEST.MF文件里面Bundle-ClassPath属性值

Bundle-ClassPath: classes/,lib/hadoop-core.jar,lib/commons-cli-1.2.jar,lib/commons-configuration-1.6.jar,lib/commons-httpclient-3.0.1.jar,lib/commons-lang-2.4.jar,lib/jackson-core-asl-1.8.8.jar,lib/jackson-mapper-asl-1.8.8.jar

在命令行进入 ${hadoop.root}/src/contrib/eclipse-plugin目录，输入: ant jar

最后在${hadoop.root}/build/contrib/eclipse-plugin目录生成打包好的插件，将hadoop-eclipse-plugin-1.1.2.jar文件复制到eclipse的plugins目录即可

eclipse3.6下载地址：http://archive.eclipse.org/eclipse/downloads/drops/R-3.6-201006080911/

ant 1.9.1 下载地址：http://download.csdn.net/detail/yonghutwo/5664701

插件下载地址： http://download.csdn.net/detail/yonghutwo/5657241