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Java adapters create IPv6 sockets even when IPv4 is disabled

A simple "hello world" type application written in Java.

Contents of config file:
OA.Endpoints=tcp -p 9999

$ netstat -tnl
tcp6 0 0 :::9999 :::* LISTEN

No tcp IPv4 socket? The same example in C++ binds only on a tcp IPv4 socket.

The consequence is that IPv4 requests are not delivered unless net.ipv6.bindv6only is set to zero in /etc/sysctl.conf (on Linux). Alternatively one may always use

When IPv6 is not disabled the master socket is also bound to IPv6. But there is no IPv4 socket available for IPv4 clients.

I didn't notice this behaviour before because previously Debian set net.ipv6.bindv6only to zero by default.

Am I doing something wrong?