EAP 7 AJP リスナーが HttpServerExchange.closeAndFlushResponse で NullPointerException を出力する

Issue

• 次のエラーが出力されます。

ERROR [io.undertow.request.io] (default I/O-6) UT005090: Unexpected failure: java.lang.NullPointerException
at io.undertow.server.HttpServerExchange.closeAndFlushResponse(HttpServerExchange.java:1716)
at io.undertow.server.HttpServerExchange.endExchange(HttpServerExchange.java:1700)
at io.undertow.server.protocol.ajp.AjpReadListener.handleEvent(AjpReadListener.java:262)
at io.undertow.server.protocol.ajp.AjpOpenListener.handleEvent(AjpOpenListener.java:156)
at io.undertow.server.protocol.ajp.AjpOpenListener.handleEvent(AjpOpenListener.java:56)
at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
at org.xnio.ChannelListeners$10.handleEvent(ChannelListeners.java:291)
at org.xnio.ChannelListeners$10.handleEvent(ChannelListeners.java:286)
at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)