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Date: Wed, 27 Apr 2011 06:18:03 +0000 (UTC)
From: "Thomas Jungblut (JIRA)" <jira@apache.org>
To: hama-dev@incubator.apache.org
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Subject: [jira] [Commented] (HAMA-378) Lost connection to BSP Master
 [host/ip:port].  Retrying...
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    [ https://issues.apache.org/jira/browse/HAMA-378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025632#comment-13025632 ] 

Thomas Jungblut commented on HAMA-378:
--------------------------------------

Yea, this could be the problem... But this is basically the same in Hadoop's source code. The only difference is that this class searching is invoked in the context of a configuration. 

> Lost connection to BSP Master [host/ip:port].  Retrying... 
> -----------------------------------------------------------
>
>                 Key: HAMA-378
>                 URL: https://issues.apache.org/jira/browse/HAMA-378
>             Project: Hama
>          Issue Type: Improvement
>          Components: bsp
>            Reporter: ChiaHung Lin
>            Priority: Minor
>
> When submitting a job, at the server side the GroomServer reports message
>     Lost connection to BSP Master [host/ip:port].  Retrying... java.lang.NullPointerException
> This seems because the script hama only includes jar files (such as hama-0.3.0-examples.jar) located under basedir, the same folder as build.xml. Also, a quick check shows that when submitting a job, the ClassLader used is sun.misc.Launcher$AppClassLoader, instead of java.net.URLClassLoader. This might not be the root cause, but a further investigation may be required. 

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