Java Builder - Multithreading issues

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Artik Crazy
Artik Crazy 2011-7-10
Hello!
I built and compiled my first serious Matlab program to Java class using the Java Builder. I wrote Java driver, which converts the necessary data types from Java to Matlab.
But now I have a problem - I try to use the same class in two parallel threads in my Java application and keep getting exceptions. When I run only one thread it works fine. What can be the problem? Please help me...
Update:
My intention is to use a Random Forest Ensemble, trained previously in Matlab, in a Java application. My Matlab function, which I compiled, using deploytool is:
function [Probability]=PredictingTest (Predictor)
load (['D:/Test/Tree.mat'], 'Tree')
[~, prob]=predict(Tree , Predictor);
Probability=prob(:,1);
end
Where:
Predictor input is an integer between -10 to 10. Probability output is a double between 0 to 1. Tree is a .mat file with a CompactTreeBagger object stored in it. Next I deploy the jar files to my Eclipse project, and try to run this Java code:
/* Necessary package imports */
import com.mathworks.toolbox.javabuilder.*;
import PredictTest.*;
public class predict_test {
static MWNumericArray rhs = null; /* Stores input value */
static PredictTest prediction;
static Object[] result = null; /* Stores the result */
public static void main(String[] args) {
try {
prediction = new PredictTest();
rhs=new MWNumericArray(5,MWClassID.DOUBLE);
result=prediction.PredictingTest(1, rhs);
}
catch (MWException e) {
e.printStackTrace();
}}}
Segmentation violation detected at Fri Jul 08 12:02:26 2011:
Configuration:
MATLAB Version: 7.11.0.584 (R2010b)
Processor ID: x86 Family 6 Model 14 Stepping 5, GenuineIntel
Virtual Machine: Java 1.6.0_22-b04 with Sun Microsystems Inc. Java HotSpot™ Client VM mixed mode

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Titus Edelhofer
Titus Edelhofer 2011-7-10
Hi,
which version of MATLAB are you using? And could you post both the exception you are seeing and how you call your class?
Titus
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Artik Crazy
Artik Crazy 2011-7-13
Hello again, thank you for your help!
Titus, I couldn't figure out the example you suggested :( Can you please give me the link again?
Friedrich, I tried to use batches in my application and it seems to be working - I will test it in full Java application tomorrow. Thank you again for an advice!
Artik Crazy
Artik Crazy 2011-7-14
It does not work... I get the same error for the example specified and my own application: "The local scheduler cannot be used in deployed applications".
I Googled and understood that it is not possible to compile and deploy applications that use the local scheduler. I don't understand why Mathworks posted this example if it is not possible at all...
I'm really confused now...

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