on creation of an order I am getting the following order in the console

15.12.2009 16:02:22.653   SEVERE                    execution.m ] Label not unique. (Order already exists)
com.dukascopy.api.JFException: Label not unique. (Order already exists)
   at com.dukascopy.api.impl.connect.m.a(Unknown Source)
   at com.dukascopy.api.impl.execution.b.call(Unknown Source)
   at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
   at java.util.concurrent.FutureTask.run(Unknown Source)
   at com.dukascopy.api.impl.execution.k$a.a(Unknown Source)
   at com.dukascopy.api.impl.execution.k$a.run(Unknown Source)
   at java.lang.Thread.run(Unknown Source)

my label is specifically unique containing references to the strategy name, the instrument and the time.

I can't be sure this happens that order creation but that is my best guess.

Is it possible that this happens because the label is too long, is there a limit to the size of the label?

Hi,
no
yes, 64 symbols.
There is such restriction for order labels:

• Label must not be null;
• Label must not be longer than 64 symbols;
• Label must contain restricted symbols;
• Label must not start with number.

Exception is thrown because an order with your given label already exists on the server. To avoid such exceptions, always before place an order, check if there isn't already placed such. Consider this example:

    public void onStart(IContext context) throws JFException {
       if (context.getEngine().getOrder("MyOrder") == null){
         context.getEngine().submitOrder("MyOrder", Instrument.EURUSD, OrderCommand.BUY, 0.5);
       }

If you are submitting order in onTick function, then to get an unique label, you must add some randomize number. Its because in one second could be lot of ticks. Here is link with example https://www.dukascopy.com/swiss/english/forex/jforex/forum/viewtopic.php?f=7&t=914

I tried this. Checking if there was an existing trade and it still says label not unique in my java console, while opening the trade no problem.

Does the problem reproduce itself every time?
Add an output of order's label every time you are trying to create it, and look in the console if the label is really not unique

Hi Support,

What are the "restricted symbols" ?

Thanks in advance.

Hi,
it's easier to say what is no restricted. For a strategy label, you could use any Latin capital or non-capital letter or this char "_".