chibenwa opened a new pull request #766:
URL: https://github.com/apache/james-project/pull/766


   Very rarely mdc can be called while the session is not yet registered.
   
   ```
   java.lang.NullPointerException
        at 
org.apache.james.imapserver.netty.ImapChannelUpstreamHandler.mdc(ImapChannelUpstreamHandler.java:112)
        at 
org.apache.james.imapserver.netty.ImapChannelUpstreamHandler.exceptionCaught(ImapChannelUpstreamHandler.java:154)
        at 
org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:112)
        at 
org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
        at 
org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
        at 
org.jboss.netty.handler.codec.frame.FrameDecoder.exceptionCaught(FrameDecoder.java:377)
        at 
org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:112)
        at 
org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
        at 
org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
        at 
org.jboss.netty.handler.execution.ChannelUpstreamEventRunnable.doRun(ChannelUpstreamEventRunnable.java:43)
        at 
org.jboss.netty.handler.execution.ChannelEventRunnable.run(ChannelEventRunnable.java:67)
        at 
org.jboss.netty.handler.execution.OrderedMemoryAwareThreadPoolExecutor$ChildExecutor.run(OrderedMemoryAwareThreadPoolExecutor.java:314)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown 
Source)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown 
Source)
        at java.base/java.lang.Thread.run(Unknown Source
   ```


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