NullPointerException in EAP 7 from ChannelListeners.invokeChannelExceptionHandler

Issue

• We saw NullPointerExceptions like below:

2023-03-01 09:40:41,178 ERROR [org.xnio.listener] (default I/O-2) XNIO001008: A channel exception handler threw an exception: java.lang.NullPointerException
    at org.xnio.ChannelListeners.invokeChannelExceptionHandler(ChannelListeners.java:126)
    at org.xnio.ChannelListeners$14.handleEvent(ChannelListeners.java:416)
    at org.xnio.ChannelListeners$14.handleEvent(ChannelListeners.java:409)
    at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
    at io.undertow.server.protocol.framed.AbstractFramedStreamSinkChannel$1.run(AbstractFramedStreamSinkChannel.java:214)
    at io.undertow.server.protocol.framed.AbstractFramedChannel$1.run(AbstractFramedChannel.java:137)
    at org.xnio.nio.WorkerThread.safeRun(WorkerThread.java:612)
    at org.xnio.nio.WorkerThread.run(WorkerThread.java:479)

2023-03-01 09:40:41,178 ERROR [org.xnio.listener] (default I/O-2) XNIO001008: A channel exception handler threw an exception: java.lang.NullPointerException
    at org.xnio.ChannelListeners.invokeChannelExceptionHandler(ChannelListeners.java:126)
    at org.xnio.ChannelListeners$14.handleEvent(ChannelListeners.java:416)
    at org.xnio.ChannelListeners$14.handleEvent(ChannelListeners.java:409)
    at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
    at org.xnio.ChannelListeners$4.run(ChannelListeners.java:147)
    at org.xnio.nio.WorkerThread.safeRun(WorkerThread.java:612)
    at org.xnio.nio.WorkerThread.run(WorkerThread.java:479)