This NPE pretty much prohibits any use of the experimental branch on
windows right now. It happens almost immediately when the node starts
up. After it has happened once it happens every time 'select' is called
for that selector.
I have verified that this problem is present in Suns JVM 1.4.1 and Suns
JVM 1.4.2
java.lang.NullPointerException
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.processFDSet(Unknown Source)
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.processSelectedKeys(Unknown
Source)
at
sun.nio.ch.WindowsSelectorImpl$SubSelector.access$2600(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl.updateSelectedKeys(Unknown
Source)
at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
at sun.nio.ch.SelectorImpl.select(Unknown Source)
at
freenet.transport.AbstractSelectorLoop.loop(AbstractSelectorLoop.java:29
5)
at
freenet.transport.ReadSelectorLoop.run(ReadSelectorLoop.java:265)
at java.lang.Thread.run(Unknown Source)
Can this workaround be applicable in our case?
http://developer.java.sun.com/developer/bugParade/bugs/4729342.html
>Workaround:
>
>I was able to reproduce this bug fairly consistently. It seems
>to occur when other threads are closing socketChannels.
>Under the right conditions, it triggers a NullPointerException in
>the select() call.
>
>In my case, the threads were closing the channels when the
>output buffer was full. (i.e. a call to socketChannel.write
>(buf) returned zero). Could this be relevant?
>
>In any case, to avoid this bug, I added a queue to the
>selector() thread. Now, when I wanted to close a
>socketChannel, I add the socketChannel to the queue and
>then call selector.wakeup(). This wakes up the thread
>blocked on select() and it now reads off the SocketChannels
>from the queue and closes them.
>
>Having done this, I no longer see the NullPointerException.
>
>Hope this helps. BTW, NIO rocks.
>
>Regards,... Fred
/N
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