Problem cast MWBuiltInArray to MWNumericArray

Côme

2012 12 26

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Hi,

I have trouble using the MCR with Java. I have a function that I call every 40 seconds that works fine for about 39 hours and suddenly I get this error message:

java.lang.ClassCastException: com.mathworks.toolbox.javabuilder.MWBuiltinArray cannot be cast to com.mathworks.toolbox.javabuilder.MWNumericArray

Every single time I try to access the function after it first failed I get the same message and after some more hours the whole software just stops.

This error appears when I try to access the output list of the function:

this.flag = ((MWNumericArray) output.get(0)).getDouble();

The value I try to access is initialized at 0 and under certain circumstance can become 1. No other value is possible.

My function usually takes 1000ms-ish to process but when it first fails it lasted for around 500~600ms and then it seems it doesn't go to the function anymore as it spends less than 1ms in it.

Does anyone have an idea why would that be?

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Walter Roberson 2012-12-26

Memory leak? Or just plain too big an array at that point? What size is your java heap set to?

Côme 2012-12-26

All the datas I use are alike. they're all the same size. I've tryed using the function unitarily on a set of data that failed it works fine so it seems it is because it was running for too long. If it was a memory leak I doubt it would be so precise it's always exacly afetr the same amout of time. I set the heap size at 1Go but other operations are performed by the software so it doesn't mean anything. Furthermore I don't keep the MCR open, I close it every single time I call it.

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