Java Utililty Methods HTTP Port Find

ServerSocket ss;
int freePort = 0;
for (int i = 0; i < 10; i++) {
    freePort = (int) (10000 + Math.round(Math.random() * 10000));
    freePort = freePort % 2 == 0 ? freePort : freePort + 1;
    try {
        ss = new ServerSocket(freePort);
        freePort = ss.getLocalPort();
...

int port = -1;
while (port <= 0) {
    Thread.sleep(100);
    ServerSocket serverSocket = null;
    try {
        serverSocket = new ServerSocket(0);
        port = serverSocket.getLocalPort();
    } finally {
...

int limit = 65534;
while (port < limit) {
    try {
        new ServerSocket(port).close();
        return port;
    } catch (IOException e) {
        ++port;
return -1;

int port = 0;
ServerSocket s = null;
boolean found = false;
while (!found) {
    try {
        s = new ServerSocket(pPort);
        if (s.isBound()) {
            port = s.getLocalPort();
...

ServerSocket socket = new ServerSocket(0);
int port = socket.getLocalPort();
socket.close();
return port;

int port = defaultPortNumber;
ServerSocket socket = null;
try {
    socket = new ServerSocket(0);
    port = socket.getLocalPort();
} catch (IOException e) {
    System.out.println("IOException occured while creating socket." + " Use a default port number " + port);
} finally {
...

int resultPort = 0;
ServerSocket s;
try {
    s = new ServerSocket(port);
    resultPort = s.getLocalPort();
    s.close();
} catch (IOException e) {
    resultPort = 0;
...

if (namespace == null || portType == null || operation == null) {
    throw new URISyntaxException(namespace + " " + portType + " " + operation,
            "The arguments can't be empty, please check");
StringBuilder builder = new StringBuilder(replaceAllLimited(new URI(namespace).getRawSchemeSpecificPart()));
if (builder.length() > 0) {
    while (builder.charAt(0) == '/') {
        builder.deleteCharAt(0);
...

int nextPort = port;
while (!isAvailable(nextPort)) {
    nextPort++;
return nextPort;

for (int index = 0; index < 5; index++) {
    try {
        ServerSocket socket = new ServerSocket(0);
        int unusedPort = socket.getLocalPort();
        socket.close();
        if (isValidPort(unusedPort)) {
            return unusedPort;
    } catch (IOException e) {
        throw new IllegalStateException("Can not find an open network port", e);
throw new IllegalStateException("Can not find an open network port");