How do I download file from remote server using jsch library ?

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Java

Spring

Hello everyone
I'm trying to download files from an sftp server and i didn't know how to make it work
I'll show you my code and tell where did i go wrong :)

What I have tried:

I tried it with the code below and when i test it with postman i got 404 not found as a response :
maybe it means that it didn't find the file to donwload ?
focus on the lines after

sftp.cd(AppLogDIR);

@Override
    public org.springframework.core.io.Resource downloadFile(String filename) {
 
        String HOST = "HOST@adresse";
        int PORT = 22;
        String USER = "username";
        String PASS = "password";
        String AppLogDIR = "/path/to/your/remote/file/";
        filename = null;
        try {
            JSch jsch = new JSch();
            session = jsch.getSession(USER, HOST, PORT);
            session.setPassword(PASS);
            java.util.Properties config = new java.util.Properties();
            config.put("StrictHostKeyChecking", "no");
            session.setConfig(config);
            session.connect();
            channel = session.openChannel("sftp");
            channel.connect();
            sftp = (ChannelSftp) channel;
            sftp.cd(AppLogDIR);
 
            byte[] buffer = new byte[1024];
            BufferedInputStream bis = new BufferedInputStream(
                    sftp.get("remoteFile.log"));
            File newFile = new File("C:/remoteFile.log"); OutputStream os = new FileOutputStream(newFile);
            BufferedOutputStream bos = new BufferedOutputStream(os);
            int readCount;
            while ((readCount = bis.read(buffer)) > 0) {
                System.out.println("Writing: ");
                bos.write(buffer, 0, readCount);
            }
 
            bis.close();
            bos.close();
 
        } catch (Exception ex) {
            ex.printStackTrace();
        }
 
        return newFile;
    }




@GetMapping(value="/download/{filename}")
public ResponseEntity<Object> downloadFile(@PathVariable String filename) {
    Resource file=sftpClient.downloadFile(filename);
    return ResponseEntity.ok()
            .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + file.getFilename() + "\"")
            .body(file);
}

i really googled and searched for a solution but none of them solved my problem this is why i m coming back to you guys

I'll be so thankful for your help !