Tomcat version: 8.0.47
OS: SUSE Linux Enterprise Server 12 (SP3)
I have a Tomcat installation where server.xml defines two connectors - NIO2
connector on port 8443 and AJP connector on port 8009 - The two connector
definitions are shown below.
<Connector SSLEnabled="true" URIEncoding="UTF-8" clientAuth="false"
keystoreFile="/mycerts/keystore" keystorePass="xxx" maxThreads="150"
port="8443" protocol="org.apache.coyote.http11.Http11Nio2Protocol"
scheme="https" secure="true" sslProtocol="TLS" acceptCount="0"
sslEnabledProtocols="TLSv1.2" ciphers="HIGH:!3DES:!EXP:!aNULL:!MD5"/>
<Connector URIEncoding="UTF-8" maxThreads="200" port="8009"
protocol="AJP/1.3" redirectPort="8443" tomcatAuthentication="false"/>
We disable non-secure http access on port 8080 by removing the connector
definition.
However, when we start and run this Tomcat, it creates three protocol handler
rather than expected two (as shown below).
17-Nov-2017 19:13:21.790 INFO [main] org.apache.coyote.AbstractProtocol.start
Starting ProtocolHandler ["http-nio-auto-1-46276"]
17-Nov-2017 19:13:21.796 INFO [main] org.apache.coyote.AbstractProtocol.start
Starting ProtocolHandler ["http-nio2-8443"]
17-Nov-2017 19:13:21.797 INFO [main] org.apache.coyote.AbstractProtocol.start
Starting ProtocolHandler ["ajp-nio-8009"]
And then, when I look at the connector thread pool, it creates a set of threads
with this name pattern - "http-nio-auto-1-exec-<number>" - in addition to the
two thread pools used by NIO2 and AJP connectors.
So, the question - What is this so-called "auto" connector for? And why is
Tomcat creating it when I did NOT configure the system to create a non-secure
http connector? Also, the listening port number used by this "auto" connector
seems random (46276 in this case) and changes from run to run, so how could it
be ever used for anything?
Thanks in advance for help
/Jong
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