[rules-users] Multi thread error
Hi,
I have a problem using Drools in a multi thread program. I want that
several threads use there own working memory. There is an error when two
thread are building the same PackageBuilder at the same time. The
exception is: java.lang.LinkageError: duplicate class definition.
Here is a simple program that generates the error.
package com.sample;
import java.io.IOException;
import java.io.InputStreamReader;
import org.drools.compiler.DroolsParserException;
import org.drools.compiler.PackageBuilder;
import org.drools.compiler.PackageBuilderConfiguration;
public class TestThreads {
public static void main(String[] args) {
for(int i = 0; i<2 ; i++) {
DroolsThread tt = new DroolsThread();
tt.start();
}
}
public static class DroolsThread extends Thread {
public void run() {
PackageBuilderConfiguration pkgBuilderCfg =
new PackageBuilderConfiguration();
PackageBuilder builder = new PackageBuilder(pkgBuilderCfg);
try {
builder.addPackageFromDrl(new
InputStreamReader(DroolsTest.class.getResourceAsStream( "/Sample.drl" )));
} catch (DroolsParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
I don't understand what to do to avoid the exception : using
"synchronized" somewhere ? Can someone help me please ?
Thanks
Pierre