Uploading file using Java gives 200 response, but no file was uploaded

Question

Hi all!

I'm trying to upload a pdf file to one of my Jira issues using Java. I tried older solutions posted on this forum, but they doesn't seem to work. Here is what I have now:

public CloseableHttpResponse addAttachment(String baseUrl, String issueKey, String filePath) throws IOException{
try (CloseableHttpClient client = HttpClientBuilder.create().build();) {
        HttpPost httpPost = new HttpPost(baseUrl+"/"+issueKey+"/attachments");
        httpPost.setHeader(new BasicHeader("Authorization", "Bearer " + apiKey));
        httpPost.setHeader("X-Atlassian-Token", "no-check");
        httpPost.setHeader("Content-Type", "multipart/form-data;boundary=gc0p4Jq0M2Yt08jU534c0p");

File file = new File(filePath);
        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
        builder.addBinaryBody("file", file, ContentType.APPLICATION_OCTET_STREAM, file.getName());

HttpEntity entity = builder.build();

httpPost.setEntity(entity);

CloseableHttpResponse response = client.execute(httpPost);

return response;
    }
}

My problem is that it sends the request and responds with 200, but with a body of: [], and nothing is uploaded. Everything works fine with Postman, so it must be something with my code.

Someone please help me fix it.

Thanks,
Ákos

Illés Ákos · Accepted Answer

I couldn't solve the problem, but found a workaround. If I use a curl command from the code then it works. 
For anyone, who has the same problem here is my code:

public String addAttachment(String issueKey, String filePath) throws IOException {
//Command to execute
    String[] command = {
"curl",
"-X", "POST",
"-H", "Authorization: Bearer " + apiKey,
"-H", "X-Atlassian-Token: no-check",
"-F", "file=@"+filePath,
baseUrl + "/issue/" + issueKey + "/attachments"
    };

// Create ProcessBuilder
    ProcessBuilder processBuilder = new ProcessBuilder(command);

// Start the process
    Process process = processBuilder.start();

// Read the output
    BufferedReader reader =
new BufferedReader(new InputStreamReader(process.getInputStream()));
    String respond = "";
    String line;
while ((line = reader.readLine()) != null) {
        respond = respond.concat(line);
    }
return respond;
}