让hadoop-0.20.2自带的eclipse插件支持eclipse-3.5以上

如果不做更改，ant jar会报错

compile:

     [echo] contrib: eclipse-plugin

    [javac] D:\self-learn\Hadoop_compile\hadoop-0.20.2_weihuap\hadoop-0.20.2\src\contrib\eclipse-plugin\build.xml:63: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds

    [javac] Compiling 45 source files to D:\self-learn\Hadoop_compile\hadoop-0.20.2_weihuap\hadoop-0.20.2\build\contrib\eclipse-plugin\classes

    [javac] D:\self-learn\Hadoop_compile\hadoop-0.20.2_weihuap\hadoop-0.20.2\src\contrib\eclipse-plugin\src\java\org\apache\hadoop\eclipse\launch\HadoopApplicationLaunchShortcut.java:35: 找不到符号

    [javac] 符号： 类 JavaApplicationLaunchShortcut

    [javac] 位置： 软件包 org.eclipse.jdt.internal.debug.ui.launcher

    [javac] import org.eclipse.jdt.internal.debug.ui.launcher.JavaApplicationLaunchShortcut;

    [javac]                                                  ^

    [javac] D:\self-learn\Hadoop_compile\hadoop-0.20.2_weihuap\hadoop-0.20.2\src\contrib\eclipse-plugin\src\java\org\apache\hadoop\eclipse\launch\HadoopApplicationLaunchShortcut.java:49: 找不到符号

    [javac] 符号： 类 JavaApplicationLaunchShortcut

    [javac]     JavaApplicationLaunchShortcut {

    [javac]     ^

    [javac] D:\self-learn\Hadoop_compile\hadoop-0.20.2_weihuap\hadoop-0.20.2\src\contrib\eclipse-plugin\src\java\org\apache\hadoop\eclipse\launch\HadoopApplicationLaunchShortcut.java:66: 找不到符号

    [javac] 符号： 变量 super

    [javac] 位置： 类 org.apache.hadoop.eclipse.launch.HadoopApplicationLaunchShortcut

    [javac]         super.findLaunchConfiguration(type, configType);

    [javac]         ^
http://hao0610.iteye.com/blog/1846984