Dear Drools team, Drools workbench team

I use the Drools 6.4.0 to construct rule business service to my J2EE application, and the Drools workbench provides a remote repository to manage the rule resources. I finished the integration about Spring and drools6.4.0 using kie-spring, it is very nice working for me.

but, when I test the auto loading rule resource from remote workbench , I met the problem as below:

I created one project named 'sample' in the remote Workbench Server. and created 2 kbases ( named 'sample_kbase' and 'price_kbase') in this project. My J2EE application using spring3 and the spring -xml is:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jee="http://www.springframework.org/schema/jee"
  xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
  xmlns:aop="http://www.springframework.org/schema/aop" xmlns:task="http://www.springframework.org/schema/task"
  xmlns:kie="http://drools.org/schema/kie-spring" 
  xsi:schemaLocation="http://www.springframework.org/schema/beans 
                     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
                     http://www.springframework.org/schema/tx 
                     http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 
                     http://www.springframework.org/schema/jee 
                     http://www.springframework.org/schema/jee/spring-jee-3.0.xsd 
                     http://www.springframework.org/schema/context 
                     http://www.springframework.org/schema/context/spring-context-3.0.xsd 
                     http://www.springframework.org/schema/aop 
                     http://www.springframework.org/schema/aop/spring-aop-2.0.xsd 
                     http://www.springframework.org/schema/task 
                     http://www.springframework.org/schema/task/spring-task.xsd 
                     http://drools.org/schema/kie-spring http://drools.org/schema/kie-spring.xsd">

  <kie:import releaseId-ref="ks-releaseId" enableScanner="true" scannerInterval="300000"/>
  <kie:releaseId id="ks-releaseId" groupId="com.genscript"
         artifactId="sample" version="LATEST"/> 


  <bean id="kiePostProcessor"
  class="org.kie.spring.annotations.KModuleAnnotationPostProcessor" /> 

</beans>

I started the j2ee tomcat server , and I got the exception:

java.lang.IllegalStateException: Could not register object [org.kie.scanner.KieRepositoryScannerImpl@32121ce3] under bean name 'ks-releaseId#scanner': there is already object [org.kie.scanner.KieRepositoryScannerImpl@32121ce3] bound
  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.registerSingleton(DefaultSingletonBeanRegistry.java:124)
  at org.kie.spring.factorybeans.KieImportFactoryBean.registerKieBases(KieImportFactoryBean.java:127)
  at org.kie.spring.factorybeans.KieImportFactoryBean.postProcessBeanFactory(KieImportFactoryBean.java:106)
  at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:640)
  at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:630)
  at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:405)
  at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:272)
  at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:196)
  at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
  at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5016)
  at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5528)
  at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
  at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1575)
  at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1565)
  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
  at java.util.concurrent.FutureTask.run(FutureTask.java:166)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
  at java.lang.Thread.run(Thread.java:722)

So, I try to debug the Drools Kie-Spring Source Code, and I found that in the class file： KieImportFactoryBean.java , the method registerKieBases throw the exception, because I have 2 Kbases defined in the Workbench Project. This method will traverse the Kbases and duplicate exec the configurableListableBeanFactory.registerSingleton(releaseIdName+"#scanner", kieScanner);

    protected void registerKieBases(ConfigurableListableBeanFactory configurableListableBeanFactory) {
        for (String kieBaseName : kContainer.getKieBaseNames()) {
            if ( scannerEnabled ) {
                registerKieBeanDef((BeanDefinitionRegistry) configurableListableBeanFactory, kieBaseName);                
                configurableListableBeanFactory.registerSingleton(releaseIdName+"#scanner", kieScanner);
            } else {
                KieBase kieBase = kContainer.getKieBase(kieBaseName);
                configurableListableBeanFactory.registerSingleton(kieBaseName, kieBase);
            }
            registerKieSessions(kieBaseName, configurableListableBeanFactory);
        }
    }

And then, I try to modify the source code to the below:

    protected void registerKieBases(ConfigurableListableBeanFactory configurableListableBeanFactory) {
        for (String kieBaseName : kContainer.getKieBaseNames()) {
            if ( scannerEnabled ) {
                registerKieBeanDef((BeanDefinitionRegistry) configurableListableBeanFactory, kieBaseName);
                
                if( !configurableListableBeanFactory.containsSingleton(releaseIdName+"#scanner") ){
                    configurableListableBeanFactory.registerSingleton(releaseIdName+"#scanner", kieScanner);
                }
            } else {
                KieBase kieBase = kContainer.getKieBase(kieBaseName);
                configurableListableBeanFactory.registerSingleton(kieBaseName, kieBase);
            }
            registerKieSessions(kieBaseName, configurableListableBeanFactory);
        }
    }

It seems running well, please Drools Team help to confirm if this is a bug about Drools 6.4.0, or My using is wrong , if i was wrong, please help to guide me to solve the problem, thanks very much.

my email address: 273305351@qq.com

best reagrds.