Reproducible on Ubuntu 22.04, armhf platform:

$/usr/lib/jvm/java-8-openjdk-armhf/bin/java -cp . TcpTest -d
Local Addresses
/10.171.165.71
/fe80:0:0:0:216:3eff:fe7a:586f%eth0
Test1: OK
server bound to /10.171.165.71:0
connecting to /fe80:0:0:0:216:3eff:fe7a:586f%eth0
binding to /fe80:0:0:0:216:3eff:fe7a:586f%eth0:0
Test2: OK
checkTime: got = 5005 start = 5000 end = 5000
Exception in thread "main" java.net.SocketException: Socket closed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:171)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at java.net.SocketInputStream.read(SocketInputStream.java:127)
at Tests.simpleRead(Tests.java:316)
at Tests.simpleDataExchange(Tests.java:49)
at TcpTest.test3(TcpTest.java:170)
at TcpTest.main(TcpTest.java:66)