本地eclipse 跑wordcount 出错

我本地搭建了一个eclipse +ｈａｄｏｏｐ环境：报错如下：
[mw_shl_code=shell,true]og4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread "main" java.lang.NullPointerException
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:1010)
        at org.apache.hadoop.util.Shell.runCommand(Shell.java:483)
        at org.apache.hadoop.util.Shell.run(Shell.java:456)
        at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:722)
        at org.apache.hadoop.util.Shell.execCommand(Shell.java:815)
        at org.apache.hadoop.util.Shell.execCommand(Shell.java:798)
        at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:728)
        at org.apache.hadoop.fs.RawLocalFileSystem.mkOneDirWithMode(RawLocalFileSystem.java:486)
        at org.apache.hadoop.fs.RawLocalFileSystem.mkdirsWithOptionalPermission(RawLocalFileSystem.java:526)
        at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:504)
        at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:305)
        at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:133)
        at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:147)
        at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1290)
        at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1287)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:415)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)[/mw_shl_code]


我是在ｅｃｌｉｐｓｅ里面启动的，如下：
hdfs://10.162.30.129:9000/user/hadoop/input hdfs://10.162.30.129:9000/user/hadoop/out

我参考的是这篇文章：
http://www.cnblogs.com/kinglau/p/3802705.html

应该是log4j没有配置造成的先排除这个