[Bug] java.net.Socket::isConnected behaves differently from openJDK

[luoxiner]

Description
the method java.net.Socket::isConnected behaves differently from openJDK
this different behavior cause the java.net.Socket::getRemoteSocketAddress returns
an unexpected null value.

the openJDK specification of java.net.Socket::isConnected is
Returns the connection state of the socket.
Note: Closing a socket doesn't clear its connection state, which means this method will return true for a closed socket (see isClosed()) if it was successfuly connected prior to being closed.
Returns:
true if the socket was successfuly connected to a server
Since:
1.4

public boolean isConnected() {
    if (WispEngine.transparentWispSwitch())
        return asyncImpl.isConnected(); // return the SocketChannelImpl.isConnected

    // Before 1.3 Sockets were always connected during creation
    return connected || oldImpl;
}

Expected behavior
return the same value as openJDk

JDK version
openjdk version "1.8.0_322"
OpenJDK Runtime Environment (Alibaba Dragonwell 8.10.11) (build 1.8.0_322-b01)
OpenJDK 64-Bit Server VM (Alibaba Dragonwell 8.10.11) (build 25.322-b01, mixed mode)

[zhengxiaolinX]

Thanks a lot for reporting this! It is indeed a discordance, and we are working on that.

[zhengxiaolinX]

Done as completed.