Attached is an example of "Double cannot be cast to" exception error on renko bars that has been mentioned in posts before. It stops the strategy.

I have run the strategy using eclipse as suggested and the error occurred again.

See end of log for the error info. Strategy that created error also attached.

T

We replaced the line 72 with the following:

         Object[] maOutputArrays = indicators.calculateIndicator(feedDescriptor, new OfferSide[] { OfferSide.BID }, "MA",
               new AppliedPrice[] { AppliedPrice.CLOSE }, maOptInputs, candlesBefore, // 3 for trend change
               bar.getTime(), candlesAfter);
         double[] maOutput = (double[]) maOutputArrays[0]; //ma has just 1 output
         print(String.format("ma output line for last %s range bars: %s",candlesBefore, Arrays.toString(maOutput)));

And we ran the strategy from a program the following way (pay attention to the instrument subscription):

        Set<Instrument> instruments = new HashSet<Instrument>();
        instruments.add(Instrument.AUDUSD);
        LOGGER.info("Subscribing instruments...");
        client.setSubscribedInstruments(instruments);
        //start the strategy
        LOGGER.info("Starting strategy");
        client.startStrategy(new RenkoMAOutByOne());

Should have any additional problems, please also provide the program which launches the strategy.

Hello

The error occurred again after the prog had been running for about 5 hours.

Error log below

2012-07-06 13:19:50.703 1.0230587
2012-07-06 13:22:07.979 ma output line for last 3 range bars: [1.023006243695344, 1.023058744535965, 1.023104245264503]
2012-07-06 13:22:07.979 1.0231042
2012-07-06 15:23:41.514 ERROR PostRenkoTask - java.lang.Double cannot be cast to [D
java.lang.ClassCastException: java.lang.Double cannot be cast to [D
at singlejartest.RenkoMAOutByOne.onBar(RenkoMAOutByOne.java:85)
at com.dukascopy.api.impl.execution.post.PostRenkoTask.postData(PostRenkoTask.java:54)
at com.dukascopy.api.impl.execution.AbstractPostDataTask.call(AbstractPostDataTask.java:43)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at com.dukascopy.api.impl.execution.ScienceThreadPoolExecutor$Worker.runTask(ScienceThreadPoolExecutor.java:904)
at com.dukascopy.api.impl.execution.ScienceThreadPoolExecutor$Worker.run(ScienceThreadPoolExecutor.java:926)
at java.lang.Thread.run(Thread.java:680)
2012-07-06 15:23:41.786 ERROR DCClientImpl$DefaultStrategyExceptionHandler - Exception thrown while running onBar method: java.lang.Double cannot be cast to [D
java.lang.ClassCastException: java.lang.Double cannot be cast to [D
at singlejartest.RenkoMAOutByOne.onBar(RenkoMAOutByOne.java:85)
at com.dukascopy.api.impl.execution.post.PostRenkoTask.postData(PostRenkoTask.java:54)
at com.dukascopy.api.impl.execution.AbstractPostDataTask.call(AbstractPostDataTask.java:43)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at com.dukascopy.api.impl.execution.ScienceThreadPoolExecutor$Worker.runTask(ScienceThreadPoolExecutor.java:904)
at com.dukascopy.api.impl.execution.ScienceThreadPoolExecutor$Worker.run(ScienceThreadPoolExecutor.java:926)
at java.lang.Thread.run(Thread.java:680)
Stopping "RenkoMAOutByOne" strategy at 2012-07-06 13:23:41.786 GMT on the local computer
2012-07-06 15:23:41.811 INFO Main - Strategy stopped: 38
java.lang.ClassCastException: java.lang.Double cannot be cast to [D @ singlejartest.RenkoMAOutByOne.onBar(RenkoMAOutByOne.java:85)
java.lang.Double cannot be cast to [D: java.lang.ClassCastException: java.lang.Double cannot be cast to [D
at singlejartest.RenkoMAOutByOne.onBar(RenkoMAOutByOne.java:85)
at com.dukascopy.api.impl.execution.post.PostRenkoTask.postData(PostRenkoTask.java:54)
at com.dukascopy.api.impl.execution.AbstractPostDataTask.call(AbstractPostDataTask.java:43)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at com.dukascopy.api.impl.execution.ScienceThreadPoolExecutor$Worker.runTask(ScienceThreadPoolExecutor.java:904)
at com.dukascopy.api.impl.execution.ScienceThreadPoolExecutor$Worker.run(ScienceThreadPoolExecutor.java:926)
at java.lang.Thread.run(Thread.java:680)

Hello support,
bellow is exception, what I´am receiving sometimes and after that is strategy stopped.

Pls should you advice me what is wrong?

thank you



java.lang.ClassCastException: java.lang.Double cannot be cast to [D
at jforex.strategies.renko.Brick_v2.onBar(Brick_v2.java:177)
at com.dukascopy.api.impl.execution.a.e.bx(Unknown Source)
at com.dukascopy.api.impl.execution.a.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at com.dukascopy.api.impl.execution.g$a.f(Unknown Source)
at com.dukascopy.api.impl.execution.g$a.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)



// calculate indicator
double[] slowMAfeed = (double[]) indicators.calculateIndicator( feedDescriptor, new OfferSide[]{OfferSide.BID}, "MA",
new AppliedPrice[]{AppliedPrice.CLOSE}, new Object[]{slowMaPeriod, slowMaType.ordinal()}, 2, bar.getTime(), 0)[0];

double[] fastMAFeed = (double[]) indicators.calculateIndicator( feedDescriptor, new OfferSide[]{OfferSide.BID}, "MA",
new AppliedPrice[]{AppliedPrice.CLOSE}, new Object[]{fastMaPeriod, fastMaType.ordinal()}, 2, bar.getTime(), 0)[0];

Hello

Is there any feedback on this one. It seems many users are encountering this error. It is difficult to test strategies in a live environment for any length of time at the moment. Do you have any temporary workarounds?

Tin

The topic has issue prefix and it has been moved to Bug Reports, which means that the issue has been registered and will be fixed as soon as possible.