es报错Unexpected exception in the selector loop

es偶尔就会报这个问题,几小时一次,麻烦帮我看一下
WARN elasticsearch[Jude the Entropic Man][transport_client_worker][T#6]{New I/O worker #15} org.elasticsearch.netty.channel.socket.nio.AbstractNioSelector - Unexpected exception in the selector loop.
java.lang.NoClassDefFoundError: java/nio/channels/DatagramChannel
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:221)
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
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