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update code comment in test

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This commit is contained in:
Jaikiran Pai 2026-01-27 21:18:36 +05:30
parent b57b088ec9
commit 2ad911f932
1 changed files with 7 additions and 6 deletions
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13
test/jdk/java/nio/channels/Selector/ConnectionRefusedMessage.java
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@ -104,17 +104,18 @@ class ConnectionRefusedMessage {
// Try to find a suitable port to provoke a "Connection Refused" error.
private static InetSocketAddress findSuitableRefusedAddress() throws IOException {
final InetAddress loopbackAddr = InetAddress.getLoopbackAddress();
// port 47 is reserved - there should be nothing listening on it
// Ports 47, 51, 61 are in the IANA reserved port list, and
// are currently unassigned to any specific service.
// We use them here on the assumption that there won't be
// any service listening on them.
InetSocketAddress destAddr = new InetSocketAddress(loopbackAddr, 47);
try (SocketChannel sc1 = SocketChannel.open(destAddr)) {
// If we manage to connect, let's try to use some other
// port.
// port 51 is reserved too - there should be nothing there.
// we managed to connect (unexpectedly), let's try the next reserved port
destAddr = new InetSocketAddress(loopbackAddr, 51);
try (SocketChannel sc2 = SocketChannel.open(destAddr)) {
}
// OK, last attempt...
// port 61 is reserved too - there should be nothing there.
// we managed to connect (unexpectedly again), let's try the next reserved port
// as a last attempt
destAddr = new InetSocketAddress(loopbackAddr, 61);
try (SocketChannel sc3 = SocketChannel.open(destAddr)) {
}