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2013-04-19T01:31:41.430
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Well, combined with hs3180's answer, here is what I actually did in configuring the compiling. <ol> <li>In ${eclipse-plugin-src}/build.xml, use the following directives to include required jars by the eclipse-plugin. Note here that, instead of from <code>${hadoop.root}/build</code>, copying of the <code>hadoop-core-${version}.jar</code> is now from <code>${hadoop.root}</code> directly, because if you are using the compiled version of hadoop, the <code>${hadoop.root}/build</code> folder would be actually empty. Copying of the <code>commons-cli-${commons-cli.version}.jar</code> is now from <code>${hadoop.root}/lib</code> for the same reason. <pre><code>  <copy file="${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="${build.dir}/lib" verbose="true"/> <copy file="${hadoop.root}/lib/commons-configuration-${commons-configuration.version}.jar" todir="${build.dir}/lib" verbose="true"/> <copy file="${hadoop.root}/lib/commons-httpclient-${commons-httpclient.version}.jar" todir="${build.dir}/lib" verbose="true"/> <copy file="${hadoop.root}/lib/commons-lang-${commons-lang.version}.jar" todir="${build.dir}/lib" verbose="true"/> <copy file="${hadoop.root}/lib/jackson-core-asl-${jackson.version}.jar" todir="${build.dir}/lib" verbose="true"/> <copy file="${hadoop.root}/lib/jackson-mapper-asl-${jackson.version}.jar" todir="${build.dir}/lib" verbose="true"/> </code></pre></li> <li>Modify the ${eclipse-plugin-src}/META-INF/MANIFEST.MF file to accommodate the changes made to ${eclipse-plugin-src}/build.xml. <pre><code>Bundle-ClassPath: classes/, lib/hadoop-core.jar, lib/commons-cli-1.2.jar, lib/commons-configuration-1.6.jar, lib/jackson-core-asl-1.8.8.jar, lib/commons-httpclient-3.0.1.jar, lib/jackson-mapper-asl-1.8.8.jar, lib/commons-lang-2.4.jar </code></pre></li> <li>Modify the ${hadoop.root}/src/contrib/build-contrib.xml file at two places. The first is to set up the properties needed for the plugin compiling. And the second is to make sure jars, especially <code>hadoop-core-1.0.4.jar</code>, in the <code>${hadoop.root}</code> folder are visible to javac, because the eclipse-plugin references the hadoop classes. This setup is different from the first two in purpose and thus not dispensable. <pre><code>  <property name="eclipse.home" location="/Users/xuj/Downloads/eclipse/"/> <property name="version" value="1.0.4"/> <property name="commons-cli.version" value="1.2"/>  <path id="contrib-classpath"> <fileset dir="${hadoop.root}"> <include name="*.jar" /> </fileset>  </path> </code></pre></li> </ol> When all files correctly configured, call 'ant jar' from <code>${eclipse-plugin-src}/</code> in the console shall be sufficient for the rest. 
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