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JMeter does not execute Java code correctly if it's ran as .jar file from command line

I'm designing JMeter scenario which implies executing a certain .jar file via OS Process Sampler element. My Java code has while loop which basically checks a certain mailbox for a letter with a certain subject. Loop waits until finds one (emails are always delivered with roughly 3 minutes delay), parses it and writes some data to .txt file.
If I run this .jar directly from cmd then the code works as expected. But if I run it via JMeter OS Process Sampler then it never creates a file for me. I do see that email is delivered to inbox, so expect it to be parsed and .txt created.
At first I suspected that JMeter finishes Java scenario without waiting for while loop to execute. Then I put OS Process Sampler in a separate Thread and added a huge delay for this thread in order to wait and make 100% sure that email is delivered and Java only need to parse it but it does not help.
View Results Tree never shows any errors.
Here is my OS Process Sampler: https://www.screencast.com/t/LomYGShJHAkS
This is what I execute via cmd and it works as expected: java -jar mailosaurJavaRun.jar email533.druzey1a#mailosaur.in
And here is my code (it does not looks good but it works):
public class Run {
public static void main(String[] args) {
MailosaurHelper ms = new MailosaurHelper();
String arg1 = ms.getFirstLinkInEmail(args[0]);
BufferedWriter output = null;
try {
File file = new File("url.txt");
output = new BufferedWriter(new FileWriter(file));
output.write(arg1);
} catch ( IOException e ) {
e.printStackTrace();
} finally {
if ( output != null ) {
try {
output.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
public class MailosaurHelper {
protected final String API_KEY = "b3e4d2b193b5eb2";
protected final String MAILBOX_ID = "d1uzey1a";
public MailboxApi getEmailBox() {
return new MailboxApi(MAILBOX_ID, API_KEY);
}
public String getFirstLinkInEmail(String email) {
MailosaurHelper ms = new MailosaurHelper();
String link = "";
if (link.equals("") || link.isEmpty()) {
try {
Thread.sleep(3000);
link = ms.getAllEmailsByReceipent(email)[0].html.links[0]
.toString();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return link;
}
public Email[] getAllEmailsByReceipent(String recepient) {
try {
int ifArrayIsEmpty = getEmailBox().getEmailsByRecipient(recepient).length;
while (ifArrayIsEmpty == 0) {
try {
Thread.sleep(3000);
ifArrayIsEmpty = getEmailBox().getEmailsByRecipient(
recepient).length;
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} catch (MailosaurException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
Email[] listOfEmails = null;
try {
listOfEmails = getEmailBox().getEmailsByRecipient(recepient);
} catch (MailosaurException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return listOfEmails;
}
The bottom line is that I need to parse Mailosaur email, retrieve URL from it and use it further. Any other suggestion on how to do that using Jmeter/Java/Mailosaur are appreciated.

You don't need cmd in here, but if you're adamant to stick with it - use /C key when you call it.
Then, are your sure you're looking for your file in the right place?
According to documentation:
By default the classes in the java.io package always resolve relative
pathnames against the current user directory. This directory is named
by the system property user.dir, and is typically the directory in
which the Java virtual machine was invoked.
Check it thoroughly, BTW - you should see it in your sampler result.

Updating Value in same instance using invokeLater

My program is supposed to search for a computer name and update the computer name value in the same instance of the GUI that it was searched in. If I launch the application and search for the computer name and hit search, it won't appear in the same instance. If I hit run again, the computer name I just searched for appears in the label in the new instance of the GUI.
So basically at the moment I have to launch a new instance of the GUI to see the updated computer name. Any help is appreciated. I've been stuck on this for a long time now.
Relevant Code:
try (BufferedReader br = new BufferedReader(new FileReader("resultofbatch.txt")))
{
final Pattern PATTERN = Pattern.compile("CN=([^,]+).*");
try {
while ((sCurrentLine = br.readLine()) != null) {
String[] tokens = PATTERN.split(","); //This will return you a array, containing the string array splitted by what you write inside it.
//should be in your case the split, since they are seperated by ","
// System.out.println(sCurrentLine);
CN = sCurrentLine.split("CN=",-1)[1].split(",",-1)[0];
System.out.println(CN);
testLabel.setText(CN);
}
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MISControlPanel window = new MISControlPanel();
window.frame.setVisible(true);
//testLabel.setText(CN);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
You can view the full class here: http://pastebin.com/8hH1TMD3

Execute AsyncTask every three seconds

I built one AsyncTask class that returns a specific value. This value changes frequently, so, I need to call my AsyncTask class multiple times to show the value updated.
I'm getting on a different class the result from the AsyncTask.
try {
output = new task().execute(getconversationid).get();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
And when the result from the AsyncTask updates, I call my other Class again to update everything.
private void call() {
new GetContacts().execute(id);
}
...
mobilemessages = contacts.length();
...
myNum = Integer.parseInt(output);
if(myNum != mobilemessages) {
call();
}
My question is how can i set a Timer or a Handler to update my class call(task) every three seconds?
Thank you.

Use Thread.sleep(3000); 3000 is in milliseconds.
Try{
Thread.sleep(3000);
}catch(Exception ex){
}

Android:NetworkOnMainThreadException error inside AsyncTask

okay so i created a inner class which extends AsycTask in order for my code to run outwith the UI thread. However i'm getting this error so i assume this means some part of my onPostExecute needs to be done in doInBackground however i cant figure out exactly what this is
public class asyncTask extends AsyncTask<String, Integer, String> {
ProgressDialog dialog = new ProgressDialog(PetrolPriceActivity.this);
#Override
protected void onPreExecute() {
dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
dialog.setProgress(0);
dialog.setMax(100);
dialog.setMessage("loading...");
dialog.show();
}
#Override
protected String doInBackground(String...parmans){
{
for(int i = 0; i < 100; i++){
publishProgress(1);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
String urlString = petrolPriceURL;
String result = "";
InputStream anInStream = null;
int response = -1;
URL url = null;
try {
url = new URL(urlString);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
return null;
}
URLConnection conn = null;
try {
conn = url.openConnection();
} catch (IOException e) {
// TODO Auto-generated catch block
return null;
}
// Check that the connection can be opened
if (!(conn instanceof HttpURLConnection))
try {
throw new IOException("Not an HTTP connection");
} catch (IOException e) {
// TODO Auto-generated catch block
return null;
}
try
{
// Open connection
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.connect();
response = httpConn.getResponseCode();
// Check that connection is OK
if (response == HttpURLConnection.HTTP_OK)
{
// Connection is OK so open a reader
anInStream = httpConn.getInputStream();
InputStreamReader in= new InputStreamReader(anInStream);
BufferedReader bin= new BufferedReader(in);
// Read in the data from the RSS stream
String line = new String();
while (( (line = bin.readLine())) != null)
{
result = result + "\n" + line;
}
}
}
catch (IOException ex)
{
try {
throw new IOException("Error connecting");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return result;
}
}
#Override
protected void onProgressUpdate(Integer...progress){
dialog.incrementProgressBy(progress[0]);
}
#Override
protected void onPostExecute(String result) {
// Get the data from the RSS stream as a string
errorText = (TextView)findViewById(R.id.error);
response = (TextView)findViewById(R.id.title);
try
{
// Get the data from the RSS stream as a string
result = doInBackground(petrolPriceURL);
response.setText(result);
Log.v(TAG, "index=" + result);
}
catch(Exception ae)
{
// Handle error
errorText.setText("Error");
// Add error info to log for diagnostics
errorText.setText(ae.toString());
}
if(dialog.getProgress() == dialog.getMax())
dialog.dismiss();
}
}
if someone could point out my error as well as show an example of where the code is suppose to go in my doInBackground that would be great. Thanks

problem:
result = doInBackground(petrolPriceURL);
you are implicitly calling the doInbackground method in the onPostExecute which will actually run in your UI thread instead on a different thread thus resulting to Android:NetworkOnMainThreadException.
Also it is unnecessary to call doInBackground that it is already executed before onPostExecute when you execute your Asynctask. Just directly use the result parameter of the onPostExecute.
sample:
#Override
protected void onPostExecute(String result) {
// Get the data from the RSS stream as a string
errorText = (TextView)findViewById(R.id.error);
response = (TextView)findViewById(R.id.title);
response.setText(result);
if(dialog.getProgress() == dialog.getMax())
dialog.dismiss();
}

I suspect the error is related to this part of your code:
try
{
// Get the data from the RSS stream as a string
result = doInBackground(petrolPriceURL);
response.setText(result);
Log.v(TAG, "index=" + result);
}
doInBackgound is called automatically when you call asynctask.execute. To start your task correctly you should (1) create a new instance of your task; (2) pass the string params you need to use in doInBackground in the execute method; (3) use them; (4) return the result to onPostExecute.
For Example:
//in your activity or fragment
MyTask postTask = new MyTask();
postTask.execute(value1, value2, value3);
//in your async task
#Override
protected String doInBackground(String... params){
//extract values
String value1 = params[0];
String value2 = params[1];
String value3 = params[2];
// do some work and return result
return value1 + value2;
}
#Override
protected void onPostExecute(String result){
//use the result you returned from you doInBackground method
}
You should try to do all of your "work" in the doInBackground method. Reutrn the result you want to use on the main/UI thread. This will automaticlly be passed as an argument to the onPostExecute method (which runs on the main/UI thread).

Socket not closing properly

I am trying to create a UDP listener that will listen on a separate thread. It works fine the first time but when I stop the connection and then start it again it gives me errors.
listenerRunnable = new Runnable() {
public void run() {
//This thread will listen keep listening to the UDP traffic and put it to the log source string
try {
sock = new DatagramSocket(portNumber);
} catch (SocketException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
while(keepListening) {
try {
pack = new DatagramPacket(recievedData, BUFFERSIZE);
sock.receive(pack);
String data = new String(pack.getData(), 0, pack.getLength());
addToLog(data);
System.out.println(data);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
sock.close();
}
}
};
/**
* Function to start the listening thread.
*/
public void startListening(int portNum) {
keepListening = true;
portNumber = portNum;
listenerThread = new Thread(listenerRunnable);
logSource_buffer = "";
logSourcehtml_buffer = "";
logSourcehtml_temp = "";
ipListIndex_beg = 0;
ipListIndex_end = -1;
if(!listenerThread.isAlive()) {
listenerThread.start();
}
}
/**
* stops the listening thead. When the listening thread sees that keepListening is set to false
* it will reach the end of its loop, close the socket, and the thread will die.
*/
public void stopListening() {
keepListening = false;
}
It gives me the following error:
logUpdatingThread has entered synchronized block!!!
java.net.SocketException: Unrecognized Windows Sockets error: 0: Cannot bind
at java.net.PlainDatagramSocketImpl.bind0(Native Method)
at java.net.PlainDatagramSocketImpl.bind(Unknown Source)
which points to the line with sock.recieve(pack);
It seems like for some reason the socket isn't closing because, I think, its waiting at sock.recieve(pack) and never gets out of the while loop to close the socket. How would I get around this though?
Thanks

As Peter Tillemans said, you should set a receive timeout so that you're not sitting there trying to receive() for ever.
Also, keep hold of the Thread object returned by new Thread(listenerRunnable) so that your stopListening() method can wait for the thread to die:
public void stopListening() {
keepListening = false;
listenerThread.join();
}

You'll have to add a setSoTimeout(timeout) before calling receive. This will regularly throw SocketTimeoutExceptions, but keeping the Datagram socket open. This will allow you to regularly check the loop variable.
Additionally you should move the loop inside the first try-catch block and add a finally block to close the socket.
like :
try {
sock = new DatagramSocket(portNumber);
sock.setSoTimeout(250);
while(keepListening) {
try {
pack = new DatagramPacket(recievedData, BUFFERSIZE);
sock.receive(pack);
String data = new String(pack.getData(), 0, pack.getLength());
addToLog(data);
System.out.println(data);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} catch (SocketException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} finally {
sock.close();
}