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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (NET-264) Telnet spyStream NullPointerException
Date Tue, 11 May 2010 00:09:30 GMT

     [ https://issues.apache.org/jira/browse/NET-264?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sebb resolved NET-264.
----------------------

    Fix Version/s: 2.1
       Resolution: Fixed

> Telnet spyStream NullPointerException
> -------------------------------------
>
>                 Key: NET-264
>                 URL: https://issues.apache.org/jira/browse/NET-264
>             Project: Commons Net
>          Issue Type: Bug
>    Affects Versions: 2.0
>            Reporter: Jeremy Stone
>             Fix For: 2.1
>
>
> Calling stopSpyStream on TelnetClient sets spyStream to null without regard to whether
_spyRead or _spyWrite are being invoked on another thread. 
> Resulting NPE in _spyRead/_spy_Write is caught in TelnetInputStream.run() which goes
on to close the stream.
> May be able to fix by taking local copy of spyStream (which ought also to be volatile)
in both of _spyRead and _spyWrite. E.g. for _spyRead:
>     void _spyRead(int ch)
>     {
>         OutputStream _spyStream = spyStream;
>         
>         if (_spyStream != null)
>         {
>             try
>             {
>                 if (ch != '\r')
>                 {
>                     _spyStream.write(ch);
>                     if (ch == '\n')
>                     {
>                         _spyStream.write('\r');
>                     }
>                     _spyStream.flush();
>                 }
>             }
>             catch (IOException e)
>             {
>                 spyStream = null;
>             }
>         }
>     }

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