Tomcat 8.5 Nio2: java.lang.IllegalStateException: Failed to create Processor for negotiated protocol [""]

[Kreuser, Peter]

Hi there,

I have setup Tomcat 8.5 with the all new SSL Config and HTTP/2.

To test the setup I use testssl.sh (https://testssl.sh ) . The scan is 
successful, also stating HTTP/2 is working. So far so good.

However I see the following exception in the Logs:

25-Apr-2016 17:36:16.697 SEVERE [https-nio2-8443-exec-6] 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process Error reading 
request, ignored
java.lang.IllegalStateException: Failed to create Processor for negotiated 
protocol [""]
                at 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:736)
                at 
org.apache.tomcat.util.net.Nio2Endpoint$SocketProcessor.run(Nio2Endpoint.java:1699)
                at 
org.apache.tomcat.util.net.Nio2Endpoint.processSocket0(Nio2Endpoint.java:397)
                at 
org.apache.tomcat.util.net.Nio2Endpoint.processSocket(Nio2Endpoint.java:382)
                at 
org.apache.tomcat.util.net.SecureNio2Channel$HandshakeWriteCompletionHandler.completed(SecureNio2Channel.java:115)
                at 
org.apache.tomcat.util.net.SecureNio2Channel$HandshakeWriteCompletionHandler.completed(SecureNio2Channel.java:108)
                at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:126)
                at sun.nio.ch.Invoker.invokeDirect(Invoker.java:157)
                at 
sun.nio.ch.UnixAsynchronousSocketChannelImpl.implWrite(UnixAsynchronousSocketChannelImpl.java:736)
                at 
sun.nio.ch.AsynchronousSocketChannelImpl.write(AsynchronousSocketChannelImpl.java:382)
                at 
sun.nio.ch.AsynchronousSocketChannelImpl.write(AsynchronousSocketChannelImpl.java:399)
                at 
java.nio.channels.AsynchronousSocketChannel.write(AsynchronousSocketChannel.java:577)
                at 
org.apache.tomcat.util.net.SecureNio2Channel.handshakeInternal(SecureNio2Channel.java:273)
                at 
org.apache.tomcat.util.net.SecureNio2Channel.handshake(SecureNio2Channel.java:204)
                at 
org.apache.tomcat.util.net.Nio2Endpoint$SocketProcessor.run(Nio2Endpoint.java:1676)
                at 
org.apache.tomcat.util.net.Nio2Endpoint.processSocket0(Nio2Endpoint.java:397)
                at 
org.apache.tomcat.util.net.Nio2Endpoint.processSocket(Nio2Endpoint.java:382)
                at 
org.apache.tomcat.util.net.SecureNio2Channel$HandshakeReadCompletionHandler.completed(SecureNio2Channel.java:98)
                at 
org.apache.tomcat.util.net.SecureNio2Channel$HandshakeReadCompletionHandler.completed(SecureNio2Channel.java:91)
                at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:126)
                at sun.nio.ch.Invoker$2.run(Invoker.java:218)
                at 
sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)
                at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
                at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
                at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
                at java.lang.Thread.run(Thread.java:745)

The sourcecode of AbstractProtocol.java states:

                if (processor == null) {
                    String negotiatedProtocol = wrapper.getNegotiatedProtocol();
                    if (negotiatedProtocol != null) {
                        UpgradeProtocol upgradeProtocol =
                                
getProtocol().getNegotiatedProtocol(negotiatedProtocol);
                        if (upgradeProtocol != null) {
                            processor = upgradeProtocol.getProcessor(
                                    wrapper, getProtocol().getAdapter());
                        } else if (negotiatedProtocol.equals("http/1.1")) {
                            // Explicitly negotiated the default protocol.
                            // Obtain a processor below.
                        } else {
                            // Failed to create processor. This is a bug.
                            throw new IllegalStateException(sm.getString(
                                    
"abstractConnectionHandler.negotiatedProcessor.fail",
                                    negotiatedProtocol));
                        }
                    }
                }

So why is this a bug? Should I change something or should Mark T. look into it?

Best regards

Peter