solution for java.nio.channels.CancelledKeyException

Hello

I am sending this to the mailing list in case other people in the future
have this problem

I had been seeing this error:

java.nio.channels.CancelledKeyException
at gnu.java.nio.SelectionKeyImpl.readyOps(libgcj.so.10)
at
org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:187)
at java.lang.Thread.run(libgcj.so.10)

and it was causing writes to be slow

After some digging I found it was because I was using an outdated version
of java: upgrading from 1.5 to 1.7 fixed this

(relevant xkcd: http://xkcd.com/979/ )