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https://issues.apache.org/jira/browse/SSHD-734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953217#comment-15953217
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ASF GitHub Bot commented on SSHD-734:
-------------------------------------
Github user grgrzybek closed the pull request at:
https://github.com/apache/mina-sshd/pull/30
> When ClientSessionImpl construction fails,
> AbstractSessionIoHandler#exceptionCaught may throw NPE
> -------------------------------------------------------------------------------------------------
>
> Key: SSHD-734
> URL: https://issues.apache.org/jira/browse/SSHD-734
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 1.4.0
> Reporter: Grzegorz Grzybek
> Assignee: Guillaume Nodet
> Fix For: 1.5.0
>
>
> # {{org.apache.sshd.common.session.helpers.AbstractSession#sendKexInit()}} is
> called in {{ClientSessionImpl}} constructor
> # {{org.apache.sshd.common.io.IoSession#write}} is called
> # async write is done with handler created by
> {{org.apache.sshd.common.io.nio2.Nio2Session#createWriteCycleCompletionHandler()}}
> # if e.g., {{sun.nio.ch.UnixAsynchronousSocketChannelImpl#implWrite()}}
> fails, it calls
> {{org.apache.sshd.common.io.nio2.Nio2CompletionHandler#onFailed()}}
> # {{org.apache.sshd.common.io.nio2.Nio2Session#exceptionCaught()}} calls
> {{org.apache.sshd.common.io.IoHandler#exceptionCaught()}}
> #
> {{org.apache.sshd.common.session.helpers.AbstractSessionIoHandler#exceptionCaught()}}
> can't find session in {{AbstractSession.getSession(ioSession, true)}}
> # it throws {{throw new IllegalStateException("No session available",
> cause)}} instead of something more related to actual problem
> The solution to "No session available" is simply to attach session in
> {{ClientSessionImpl}} constructor before starting sshd handshake
> There's however more - how to propagate the exception from
> {{ClientSessionImpl}} constructor?
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