[SSHD-19] NullPointerException during SSHD data write

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.6.0
• Assignee: Shawn Pearce
• Reporter: Shawn Pearce
• Created: 16/Apr/09 21:50
• Updated: 06/Nov/10 00:13
• Resolved: 06/Nov/10 00:03

Description

I'm seeing occasional NullPointerException stack traces in my server logs. The following trace is from SVN trunk@755651. I haven't been able to reproduce it myself, nor can I figure out under what condition doWriteData is being invoked with shellIn uninitialized.

java.lang.NullPointerException
at org.apache.sshd.server.channel.ChannelSession.doWriteData(ChannelSession.java:155)
at org.apache.sshd.common.channel.AbstractChannel.handleData(AbstractChannel.java:117)
at org.apache.sshd.common.session.AbstractSession.channelData(AbstractSession.java:867)
at org.apache.sshd.server.session.ServerSession.handleMessage(ServerSession.java:198)
at org.apache.sshd.common.session.AbstractSession.decode(AbstractSession.java:494)
at org.apache.sshd.common.session.AbstractSession.messageReceived(AbstractSession.java:218)
at org.apache.sshd.common.AbstractSessionIoHandler.messageReceived(AbstractSessionIoHandler.java:59)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:722)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:48)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:802)
at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:120)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:426)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:586)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:547)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:539)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:57)
at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:867)
at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:65)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)