Hadoop2.4.0 Eclipse插件制作及问题记录
问题导读：
1.build.xml文件的作用是什么？
2.hadoop2.4用的commons-lang-2.6.jar，在build.xml中该如何修改？
3.插件包的制作需要经过几个步骤？
参考hadoop2x-eclipse-plugin
说说我的整个制作过程吧：
想导入到eclipse中制作，但是导入进去之后觉得麻烦就算了，直接在win7 64位、JDK1.6、ANT1.8的环境下以命令行运行
依葫芦画瓢，设置eclipse的目录和hadoop的目录，在没有修改任何文件的情况下直接运行
D:\SDK\hadoop2x-eclipse-plugin-master\src\contrib\eclipse-plugin>ant jar -Dversion=2.4.0 -Declipse.home=D:\WorkTools\MyEclipse10\Common -Dhadoop.home=D:\SDK\hadoop-2.4.0
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在ivy-resolve-common处卡了大概138分钟，最后build失败，查看原因有两个，一个是找不到4个依赖包，一个是找不到1个核心包
依赖包分别是这些，可能是换路径了吧：
https://oss.sonatype.org/content/groups/public/com/google/google/1/google-1.jar
https://oss.sonatype.org/content/groups/public/net/java/jvnet-parent/1/jvnet-parent-1.jar
https://oss.sonatype.org/content/groups/public/com/sun/jersey/contribs/jersey-contribs/1.9/jersey-contribs-1.9.jar
https://oss.sonatype.org/content/groups/public/org/eclipse/jetty/jetty-parent/14/jetty-parent-14.jar
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核心包是commons-lang-2.5.jar
想了一下，觉得那四个依赖包似乎没什么用，便想跳过那个步骤，想直接进行编译插件的步骤，便修改了“hadoop2x-eclipse-plugin-master\src\contrib\eclipse-plugin\build.xml”文件
<target name="compile" depends="init, ivy-retrieve-common" unless="skip.contrib"> 去掉depends
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核心包去hadoop2.4目录找，发现hadoop2.4用的commons-lang-2.6.jar，便在build.xml中找到相应位置改为2.6，这个需要说的是作者可能偷懒，在拷贝文件中使用的是变量，在配置信息中直接使用了2.5，不统一，变量配置信息在“hadoop2x-eclipse-plugin-master\ivy\libraries.properties”文件中，搜索“commons-lang.version”将对应的版本改为2.6，好了，在命令行下运行ant，成功在“hadoop2x-eclipse-plugin-master\build\contrib\eclipse-plugin”下生成插件
兴奋的拿着插件跟myeclipse10里试，失败（插件压根不出现），跟eclipse3.7里试，失败（插件能出现，但是无法正常使用，新增不了location）
拿着现成的2.2的插件均可以正常使用
后来经过排查原因myeclipse10里是因为插件放的位置不对，不能直接放到plugin里；eclipse3.7里失败是因为插件还缺少包
如何排查的呢？看eclipse的启动日志，这个日志在workplace中的.metadata文件下的.log文件，在eclipse3.7里报的错误是无法初始化hadoop，很郁闷，没太大帮助，于是就上eclilpse的官网下载了最新版的eclipse4.3.2，将ant语句改为
D:\SDK\hadoop2x-eclipse-plugin-master\src\contrib\eclipse-plugin>ant jar -Dversion=2.4.0 -Declipse.home=D:\WorkTools\eclipse4.3.2 -Dhadoop.home=D:\SDK\hadoop-2.4.0
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对，改为以eclipse4.3.2为eclipse目录(这个配置主要就是为生成eclipse插件提供jar包支持)，生成插件后放到eclipse4.3.2的plugins里，启动eclipse并观察日志，抛出异常
java.lang.NoClassDefFoundError: org/apache/commons/collections/map/UnmodifiableMap
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yes~ 折腾了又两个多小时，终于让我抓住了，找到这个包，在build.xml中添加上，别忘了在配置信息中也要添加，就是文件最下边的attribute，如果想以后方便，版本号也可以通过变量形式在libraries.properties中维护，搞定后，重新运行ant
终于行了，在myeclipse10下也可正常使用了（这么建立文件夹MyEclipse 10\dropins\hadoop\eclipse\plugins，把插件扔这个文件夹下边就行了）
------------------------------------------------最终的build.xml文件，修改的地方有注释---------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<project default="jar" name="eclipse-plugin">
<import file="../build-contrib.xml"/>
<path id="eclipse-sdk-jars">
<fileset dir="${eclipse.home}/plugins/">
<include name="org.eclipse.ui*.jar"/>
<include name="org.eclipse.jdt*.jar"/>
<include name="org.eclipse.core*.jar"/>
<include name="org.eclipse.equinox*.jar"/>
<include name="org.eclipse.debug*.jar"/>
<include name="org.eclipse.osgi*.jar"/>
<include name="org.eclipse.swt*.jar"/>
<include name="org.eclipse.jface*.jar"/>
<include name="org.eclipse.team.cvs.ssh2*.jar"/>
<include name="com.jcraft.jsch*.jar"/>
</fileset>
</path>
<path id="hadoop-sdk-jars">
<fileset dir="${hadoop.home}/share/hadoop/mapreduce">
<include name="hadoop*.jar"/>
</fileset>
<fileset dir="${hadoop.home}/share/hadoop/hdfs">
<include name="hadoop*.jar"/>
</fileset>
<fileset dir="${hadoop.home}/share/hadoop/common">
<include name="hadoop*.jar"/>
</fileset>
</path>
<path id="classpath">
<pathelement location="${build.classes}"/>
<path refid="eclipse-sdk-jars"/>
<path refid="hadoop-sdk-jars"/>
</path>
<target name="check-contrib" unless="eclipse.home">
<property name="skip.contrib" value="yes"/>
<echo message="eclipse.home unset: skipping eclipse plugin"/>
</target>
<!-- 这里我最后删除了depends="init, ivy-retrieve-common" -->
<target name="compile" depends="init, ivy-retrieve-common" unless="skip.contrib">
<echo message="contrib: ${name}"/>
<javac
encoding="${build.encoding}"
srcdir="${src.dir}"
includes="**/*.java"
destdir="${build.classes}"
debug="${javac.debug}"
deprecation="${javac.deprecation}">
<classpath refid="classpath"/>
</javac>
</target>
<target name="jar" depends="compile" unless="skip.contrib">
<mkdir dir="${build.dir}/lib"/>
<copy todir="${build.dir}/lib/" verbose="true">
<fileset dir="${hadoop.home}/share/hadoop/mapreduce">
<include name="hadoop*.jar"/>
</fileset>
</copy>
<copy todir="${build.dir}/lib/" verbose="true">
<fileset dir="${hadoop.home}/share/hadoop/common">
<include name="hadoop*.jar"/>
</fileset>
</copy>
<copy todir="${build.dir}/lib/" verbose="true">
<fileset dir="${hadoop.home}/share/hadoop/hdfs">
<include name="hadoop*.jar"/>
</fileset>
</copy>
<copy todir="${build.dir}/lib/" verbose="true">
<fileset dir="${hadoop.home}/share/hadoop/yarn">
<include name="hadoop*.jar"/>
</fileset>
</copy>
<copy todir="${build.dir}/classes" verbose="true">
<fileset dir="${root}/src/java">
<include name="*.xml"/>
</fileset>
</copy>
<copy file="${hadoop.home}/share/hadoop/common/lib/protobuf-java-${protobuf.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<copy file="${hadoop.home}/share/hadoop/common/lib/log4j-${log4j.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<copy file="${hadoop.home}/share/hadoop/common/lib/commons-cli-${commons-cli.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<copy file="${hadoop.home}/share/hadoop/common/lib/commons-configuration-${commons-configuration.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<copy file="${hadoop.home}/share/hadoop/common/lib/commons-lang-${commons-lang.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<!-- 下边这行是新增的，原来没有 -->
<copy file="${hadoop.home}/share/hadoop/common/lib/commons-collections-${commons-collections.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<copy file="${hadoop.home}/share/hadoop/common/lib/jackson-core-asl-${jackson.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<copy file="${hadoop.home}/share/hadoop/common/lib/jackson-mapper-asl-${jackson.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<copy file="${hadoop.home}/share/hadoop/common/lib/slf4j-log4j12-${slf4j-log4j12.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<copy file="${hadoop.home}/share/hadoop/common/lib/slf4j-api-${slf4j-api.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<copy file="${hadoop.home}/share/hadoop/common/lib/guava-${guava.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<copy file="${hadoop.home}/share/hadoop/common/lib/hadoop-auth-${hadoop.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<copy file="${hadoop.home}/share/hadoop/common/lib/commons-cli-${commons-cli.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<copy file="${hadoop.home}/share/hadoop/common/lib/netty-${netty.version}.jar" todir="${build.dir}/lib" verbose="true"/>
<jar
jarfile="${build.dir}/hadoop-${name}-${version}.jar"
manifest="${root}/META-INF/MANIFEST.MF">
<manifest>
<attribute name="Bundle-ClassPath"
value="classes/,
lib/hadoop-mapreduce-client-core-${hadoop.version}.jar,
lib/hadoop-mapreduce-client-common-${hadoop.version}.jar,
lib/hadoop-mapreduce-client-jobclient-${hadoop.version}.jar,
lib/hadoop-auth-${hadoop.version}.jar,
lib/hadoop-common-${hadoop.version}.jar,
lib/hadoop-hdfs-${hadoop.version}.jar,
lib/protobuf-java-${protobuf.version}.jar,
lib/log4j-${log4j.version}.jar,
lib/commons-cli-1.2.jar,
lib/commons-configuration-1.6.jar,
lib/commons-httpclient-3.1.jar,
<!-- 下边这行原来写的是commons-lang-2.5 -->
lib/commons-lang-${commons-lang.version}.jar,
<!-- 下边这行是新增的，原来没有 -->
lib/commons-collections-${commons-collections.version}.jar,
lib/jackson-core-asl-1.8.8.jar,
lib/jackson-mapper-asl-1.8.8.jar,
lib/slf4j-log4j12-1.7.5.jar,
lib/slf4j-api-1.7.5.jar,
lib/guava-${guava.version}.jar,
lib/netty-${netty.version}.jar"/>
</manifest>
<fileset dir="${build.dir}" includes="classes/ lib/"/>
<fileset dir="${root}" includes="resources/ plugin.xml"/>
</jar>
</target>
</project>
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