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Broken PHP / Java connection not working

I was stuck for two days with the following problem: I wrote a Java socket server that can receive and send data to a socket hosted on "localhost: 64005". I can connect to it via php and send or receive messages. However, I cannot send and then receive a response. I traced the problem to the php script that I wrote.

<?php
    class socketCommunication{
        protected $PK;
        protected $ip = '127.0.0.1';
        protected $port = 64005;
        protected $socket;
        public $result;

        function __construct($key){
         $this->socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");
         $this->result = socket_connect($this->socket, $this->ip, $this->port) or die("Could not connect to server\n");
         $this->PK = $key;
         $this->sendSocket();
        }

        function getResponse(){
            //$input =  socket_read($this->socket, 1024) or die("Could not read");
            $bytes = socket_recv($this->socket, $buf, 2048, MSG_WAITALL);
            return $buf;
        }

        function sendSocket(){
            $len = strlen($this->PK);
            socket_send ($this->socket, $this->PK, $len, 0);
        }
    }
?>

<?php
    //include("/mysql/RandomQuery.php");
    include("/java/socketCommunication.php");

    $object2 = new socketCommunication(100001);
    echo $object2->getResponse();
 ?>

Java socket server:

package Server;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.concurrent.Semaphore;

import Database.Reader;

public class Receive implements Runnable {
    Semaphore semaphore;
    private Socket connection;
    String result = "default";

    public Receive(Socket conn, Semaphore sem){
        this.connection = conn;
        this.semaphore = sem;
    }

    @Override
    public void run() {
            try {
                semaphore.acquire();
                System.out.println(connection.toString());
                BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                PrintWriter out = new PrintWriter(connection.getOutputStream(), true);
                String userInput;
                while ((userInput = in.readLine()) != null) {
                    System.out.println(userInput);
                    Reader reader = new Reader(Integer.parseInt(userInput));
                    this.result = reader.getResult();
                    System.out.println(result);
                    out.println(result);
                    break;
                }
                connection.close();
                in.close();
                System.out.println("input is closed");
                semaphore.release();
                } catch (IOException | InterruptedException e) {e.printStackTrace();}
    }

}

As soon as I call the sendSocket and getResponse methods in php, the page just loads endlessly. However, if I just call sendSocket or getResponse (after changing the java socket so that it will not wait for input), they will work fine.

what am I doing wrong?

Sincerely.

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