If a resumeWrites operation is performed on the right (sink) channel of a half duplex channel pipe, the following exception is thrown:

java.lang.IllegalArgumentException: No thread configured
at org.xnio.nio.AbstractNioStreamSinkChannel.resumeWrites(AbstractNioStreamSinkChannel.java:92)
at org.xnio.nio.test.AbstractNioChannelPipeTest$11.handleEvent(AbstractNioChannelPipeTest.java:441)
... 4 more

The same happens if a resumeReads operation is performed on the left (source) channel of the same channel pipe.