On 31.03.2020 14:20, Mark Thomas wrote:
On 31/03/2020 11:20, Aditya Kumar wrote:
Tomcat 9.0.30 on Windows Server 2012 / Java 1.8
I've noticed on a freshly installed version of tomcat 9, upon startup there
are several connections to and from localhost on different ports
For example on my tomcat server there are 4 connections to and from
localhost (output from netstat)
TCP 0.0.0.0:8080 0.0.0.0:0 LISTENING 3972
TCP 127.0.0.1:55618 127.0.0.1:55619 ESTABLISHED 3972
TCP 127.0.0.1:55619 127.0.0.1:55618 ESTABLISHED 3972
TCP 127.0.0.1:55620 127.0.0.1:55621 ESTABLISHED 3972
TCP 127.0.0.1:55621 127.0.0.1:55620 ESTABLISHED 3972
TCP [::]:8080 [::]:0 LISTENING 3972
These can grow to a large number (several thousand) on a busy system. What
are these connections used for? What caused them? What thread are they
attributed to?
The Java NIO implementation on Windows uses TCP for intra-process
signalling. It opens a pair of self-connected sockets for every Selector.
Mark
While we're at it, under Linux, are the following for a similar reason ?
output of : netstat -pan | grep 27514 (tomcat's JVM PID = 27514)
[...]
unix 2 [ ] STREAM CONNECTED 167427210 27514/java
unix 2 [ ] STREAM CONNECTED 167423436 27514/java
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