Re: [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 _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users