# Received: "" (no content received) before the code executes
**URL:** https://forum.codecrafters.io/t/received-no-content-received-before-the-code-executes/15396
**Category:** Challenges
**Tags:** challenge:redis
**Created:** [October 13, 2025, 7:43am UTC](https://forum.codecrafters.io/t/received-no-content-received-before-the-code-executes/15396 "2025-10-13T07:43:51Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@sabyasachinayak3001](https://forum.codecrafters.io/u/sabyasachinayak3001)
#### Post date: [October 13, 2025, 7:43am UTC](https://forum.codecrafters.io/t/received-no-content-received-before-the-code-executes/15396/1 "2025-10-13T07:43:51Z")
I’m stuck on Stage #LX4
I’ve tried .. adding print statements, to check why if my code is not running properly, but i am not able to find out why it shows the _Received: “” (no content received)_ in the logs.
Here are my logs:
```auto
[tester::#LX4] Running tests for Stage #LX4 (Lists - Append multiple elements)
[tester::#LX4] $ ./your_program.sh
[tester::#LX4] [client] $ redis-cli RPUSH blueberry mango banana
[tester::#LX4] [client] Sent bytes: "*4\r\n$5\r\nRPUSH\r\n$9\r\nblueberry\r\n$5\r\nmango\r\n$6\r\nbanana\r\n"
[tester::#LX4] Received: "" (no content received)
[tester::#LX4] ^ error
[tester::#LX4] Error: Expected start of a new RESP2 value (either +, -, :, $ or *)
[tester::#LX4] Test failed
[tester::#LX4] Terminating program
[your_program] INPUT COMMAND = RPUSH
[your_program] INSIDE RPUSH
[your_program] LIST ITEM = MANGO
[your_program] LIST ITEM = BANANA
[tester::#LX4] Program terminated successfully
```
And here’s a snippet of my code:
```java
public static void main(String[] args){
// You can use print statements as follows for debugging, they'll be visible when running tests.
// System.out.println("Logs from your program will appear here!");
// Uncomment this block to pass the first stage
ServerSocket serverSocket = null;
// Socket clientSocket = null;
int port = 6379;
try {
serverSocket = new ServerSocket(port);
// Since the tester restarts your program quite often, setting SO_REUSEADDR
// ensures that we don't run into 'Address already in use' errors
serverSocket.setReuseAddress(true);
// Wait for connection from client.
// while (true) {
Socket clientSocket = serverSocket.accept();
new Thread(() -> handleClientRefactored(clientSocket)).start();
// }
} catch (IOException e) {
System.out.println("IOException: " + e.getMessage());
}
}
```
static void handleClientRefactored(final Socket clientSocket) {
try {
Map\ chm = new ConcurrentHashMap\<\>();
List list = new ArrayList\<\>();
// BufferedReader in = new BufferedReader(new InputStreamReader(inputStream));
// BufferedWriter out = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
```auto
while (true) {
InputStream inputStream = clientSocket.getInputStream();
String\[\] input = parseInputStream(inputStream);
System.out.println("INPUT STREAM LENGTH = " + input.length);
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
if(input.length < 2) {
break;
}
System.out.println("INPUT COMMAND = " + input\[2\].toUpperCase());
if(input\[2\].equalsIgnoreCase("PING")) {
System.out.println("INSIDE PING");
clientSocket.getOutputStream().write("+PONG\\r\\n".getBytes());
```
// out.write(“+PONG\r\n”);
clientSocket.getOutputStream().flush();
}
else if(input[2].equalsIgnoreCase(“ECHO”)) {
System.out.println(“INSIDE ECHO”);
out.write(input[3] + “\r\n” + input[4] + “\r\n”);
out.flush();
}
else if(input[2].equalsIgnoreCase(“SET”)) {
System.out.println(“INSIDE SET”);
String key = input[4];
String val = input[6];
SetObject so = new SetObject();
so.setVal(val);
if(input.length \< 8) {
out.write(“+OK\r\n”);
out.flush();
chm.put(key, so);
}
String expiryFlag = input[8];
if(expiryFlag.equalsIgnoreCase(“PX”)) {
String nb4 = input[9];
String time = input[10];
long ms = Long.parseLong(time);
so.setPx(true);
so.setPxTimeEnd(System.currentTimeMillis()+ms);
// System.out.println(“PX FLAG: " + ms);
}
chm.put(key, so);
}
else if(input[2].equalsIgnoreCase(“GET”)) {
System.out.println(“INSIDE GET”);
String key = input[4];
if(chm.get(key) == null) {
out.write(”$-1\r\n");
}
else {
SetObject val = chm.get(key);
if(val.isPx()) {
if(System.currentTimeMillis() \> val.getPxTimeEnd()) {
chm.remove(key);
out.write(“$-1\r\n”);
}
else {
out.write(“$” + val.getVal().length() + “\r\n” + chm.get(key).getVal() + “\r\n”);
}
}
else out.write(“$” + val.getVal().length() + “\r\n” + chm.get(key).getVal() + “\r\n”);
}
out.flush();
}
else if(input[2].equalsIgnoreCase(“RPUSH”)) {
System.out.println(“INSIDE RPUSH”);
for(int i=6; i\
### Author:  [@sabyasachinayak3001](https://forum.codecrafters.io/u/sabyasachinayak3001)
#### Post date: [October 14, 2025, 11:02am UTC](https://forum.codecrafters.io/t/received-no-content-received-before-the-code-executes/15396/5 "2025-10-14T11:02:55Z")
Apparently it is due to completely reading the InputStream, before sending the output, hence this odd behaviour
---
### Author:  [@system](https://forum.codecrafters.io/u/system)
#### Post date: [October 19, 2025, 11:03am UTC](https://forum.codecrafters.io/t/received-no-content-received-before-the-code-executes/15396/9 "2025-10-19T11:03:42Z")
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