IllegalArgumentException: hostname can't be null

java.lang.IllegalArgumentException: hostname can't be null    at java.base/java.net.InetSocketAddress.checkHost(InetSocketAddress.java:149)
    at java.base/java.net.InetSocketAddress.<init>(InetSocketAddress.java:216) 

       @Override
    public boolean isJobManagerPortReady(Configuration config) {
        final URI uri;
        try (var clusterClient = getClusterClient(config)) {
            uri = URI.create(clusterClient.getWebInterfaceURL());
        } catch (Exception ex) {
            throw new FlinkRuntimeException(ex);
        }
        SocketAddress socketAddress = new InetSocketAddress(uri.getHost(), uri.getPort());
        Socket socket = new Socket();
        try {
            socket.connect(socketAddress, 1000);
            socket.close();
            return true;
        } catch (IOException e) {
            return false;
        }
    }
  

@ParameterizedTest
@ValueSource(
        strings = {"http://127.0.0.1:8081", "http://123-dev:8081", "http://dev-test.abc:8081", "http://dev-test.1a:8081", "http://dev-test.abc01:8081"})
void testURLAddresses(String inputAddress) {

    assertDoesNotThrow(
            () -> {
                final URL url = new URL(inputAddress);
                new InetSocketAddress(url.getHost(), url.getPort());
            });
} 

@ParameterizedTest
@ValueSource(
        strings = {"http://127.0.0.1:8081", "http://123-dev:8081", "http://dev-test.abc:8081", "http://dev-test.1a:8081", "http://dev-test.abc01:8081"})
void testURIAddresses(String inputAddress) {

    assertDoesNotThrow(
            () -> {
                final URI uri = new URI(inputAddress);
                new InetSocketAddress(uri.getHost(), uri.getPort());
            });
}