[undertow-dev] Java 9: sun.misc.Cleaner not found

I just updated to Java 9 and have started getting the following exception: exampleJVM[ERROR] Oct 09, 2017 11:45:35 AM io.undertow.server.DirectByteBufferDeallocator <clinit> exampleJVM[ERROR] ERROR: UT005091: Failed to initialize DirectByteBufferDeallocator exampleJVM[ERROR] java.lang.ClassNotFoundException: sun.misc.Cleaner exampleJVM[ERROR] at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582) exampleJVM[ERROR] at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:185) exampleJVM[ERROR] at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496) exampleJVM[ERROR] at java.base/java.lang.Class.forName0(Native Method) exampleJVM[ERROR] at java.base/java.lang.Class.forName(Class.java:292) exampleJVM[ERROR] at io.undertow.server.DirectByteBufferDeallocator.<clinit>(DirectByteBufferDeallocator.java:23) exampleJVM[ERROR] at io.undertow.server.DefaultByteBufferPool.queueIfUnderMax(DefaultByteBufferPool.java:207) exampleJVM[ERROR] at io.undertow.server.DefaultByteBufferPool.freeInternal(DefaultByteBufferPool.java:199) exampleJVM[ERROR] at io.undertow.server.DefaultByteBufferPool.access$200(DefaultByteBufferPool.java:41) exampleJVM[ERROR] at io.undertow.server.DefaultByteBufferPool$DefaultPooledBuffer.close(DefaultByteBufferPool.java:269) exampleJVM[ERROR] at io.undertow.conduits.DeflatingStreamSinkConduit.deflateData(DeflatingStreamSinkConduit.java:495) exampleJVM[ERROR] at io.undertow.conduits.DeflatingStreamSinkConduit.write(DeflatingStreamSinkConduit.java:117) exampleJVM[ERROR] at io.undertow.conduits.DeflatingStreamSinkConduit.write(DeflatingStreamSinkConduit.java:138) exampleJVM[ERROR] at org.xnio.conduits.ConduitStreamSinkChannel.write(ConduitStreamSinkChannel.java:154) exampleJVM[ERROR] at io.undertow.channels.DetachableStreamSinkChannel.write(DetachableStreamSinkChannel.java:187) exampleJVM[ERROR] at io.undertow.server.HttpServerExchange$WriteDispatchChannel.write(HttpServerExchange.java:2046) exampleJVM[ERROR] at io.undertow.io.AsyncSenderImpl.send(AsyncSenderImpl.java:219) exampleJVM[ERROR] at io.undertow.io.AsyncSenderImpl.send(AsyncSenderImpl.java:310) exampleJVM[ERROR] at io.undertow.io.AsyncSenderImpl.send(AsyncSenderImpl.java:282) exampleJVM[ERROR] at io.youi.server.UndertowServerImplementation$.handleStandard(UndertowServerImplementation.scala:250) exampleJVM[ERROR] at io.youi.server.UndertowServerImplementation$.response(UndertowServerImplementation.scala:169) exampleJVM[ERROR] at io.youi.server.UndertowServerImplementation.$anonfun$requestHandler$1(UndertowServerImplementation.scala:100) exampleJVM[ERROR] at io.youi.server.UndertowServerImplementation.$anonfun$requestHandler$1$adapted(UndertowServerImplementation.scala:97) exampleJVM[ERROR] at io.youi.server.UndertowServerImplementation$.handle$1(UndertowServerImplementation.scala:126) exampleJVM[ERROR] at io.youi.server.UndertowServerImplementation$.processRequest(UndertowServerImplementation.scala:162) exampleJVM[ERROR] at io.youi.server.UndertowServerImplementation.requestHandler(UndertowServerImplementation.scala:97) exampleJVM[ERROR] at io.youi.server.UndertowServerImplementation.$anonfun$handleRequest$1(UndertowServerImplementation.scala:90) exampleJVM[ERROR] at io.youi.ErrorSupport.errorSupport(ErrorSupport.scala:11) exampleJVM[ERROR] at io.youi.ErrorSupport.errorSupport$(ErrorSupport.scala:10) exampleJVM[ERROR] at io.youi.example.ServerExampleApplication$.errorSupport(ServerExampleApplication.scala:8) exampleJVM[ERROR] at io.youi.server.UndertowServerImplementation.handleRequest(UndertowServerImplementation.scala:74) exampleJVM[ERROR] at io.undertow.server.handlers.encoding.EncodingHandler.handleRequest(EncodingHandler.java:72) exampleJVM[ERROR] at io.undertow.server.Connectors.executeRootHandler(Connectors.java:332) exampleJVM[ERROR] at io.undertow.server.protocol.http.HttpReadListener.handleEventWithNoRunningRequest(HttpReadListener.java:254) exampleJVM[ERROR] at io.undertow.server.protocol.http.HttpReadListener.handleEvent(HttpReadListener.java:136) exampleJVM[ERROR] at io.undertow.server.protocol.http.HttpOpenListener.handleEvent(HttpOpenListener.java:151) exampleJVM[ERROR] at io.undertow.server.protocol.http.HttpOpenListener.handleEvent(HttpOpenListener.java:92) exampleJVM[ERROR] at io.undertow.server.protocol.http.HttpOpenListener.handleEvent(HttpOpenListener.java:51) exampleJVM[ERROR] at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) exampleJVM[ERROR] at org.xnio.ChannelListeners$10.handleEvent(ChannelListeners.java:291) exampleJVM[ERROR] at org.xnio.ChannelListeners$10.handleEvent(ChannelListeners.java:286) exampleJVM[ERROR] at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) exampleJVM[ERROR] at org.xnio.nio.QueuedNioTcpServer$1.run(QueuedNioTcpServer.java:129) exampleJVM[ERROR] at org.xnio.nio.WorkerThread.safeRun(WorkerThread.java:582) exampleJVM[ERROR] at org.xnio.nio.WorkerThread.run(WorkerThread.java:466)