Java Utililty Methods HTTP Port Find

final int MIN_PORT_LIMIT = 1;
final int MAX_PORT_LIMIT = 65536;
if (minPort < 0)
    minPort = MIN_PORT_LIMIT;
if (maxPort > MAX_PORT_LIMIT)
    maxPort = MAX_PORT_LIMIT;
IOException ioEx = null;
for (int i = minPort; i <= maxPort; i++) {
...

int[] ports = new int[count];
Set<ServerSocket> openSockets = new HashSet<ServerSocket>(count + USED_PORTS.size());
for (int i = 0; i < count;) {
    try {
        ServerSocket socket = new ServerSocket(0);
        int port = socket.getLocalPort();
        openSockets.add(socket);
        if (!USED_PORTS.contains(port)) {
...

int start = MIN_PORT_NUMBER + 1;
boolean stop = false;
List<Integer> result = new ArrayList<Integer>();
while (!stop && start < MAX_PORT_NUMBER) {
    if (available(start, MIN_PORT_NUMBER, MAX_PORT_NUMBER)) {
        result.add(start);
        if (result.size() == number) {
            stop = true;
...

StringBuilder result = new StringBuilder();
URL url = new URL(String.format("http://%s:%s", InetAddress.getLocalHost().getHostAddress(), metricsPort));
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = rd.readLine()) != null) {
    result.append(line + System.lineSeparator());
...

int port = 2048;
boolean br = false;
while (port < 49151 && !br) {
    try {
        new ServerSocket(port).close();
        new DatagramSocket(port).close();
        br = true;
    } catch (Exception ex) {
...

return getRandomFreePort(MIN_PORT, MAX_PORT);

Random r = new Random();
int count = 0;
while (count < 13) {
    int port = r.nextInt((1 << 16) - 1024) + 1024;
    try (ServerSocket so = new ServerSocket(port)) {
        so.setReuseAddress(true);
        return port;
    } catch (IOException e) {
...

try (ServerSocket socket = new ServerSocket(0)) {
    return socket.getLocalPort();

for (int port = 22332; port < 22500; port++) {
    if (trySocket(port)) {
        return port;
throw new IllegalStateException("Cannot find a single free port");

ServerSocket server = null;
try {
    server = new ServerSocket(0);
    return server.getLocalPort();
} catch (IOException e) {
    throw new Error(e);
} finally {
    if (server != null) {
...