[jboss-jira] [JBoss JIRA] (DROOLS-396) Caused by: java.lang.NoClassDefFoundError: org/drools/event/DebugProcessEventListener

[Kenny Wottrich (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13273659#comment-13273659 ] 

Kenny Wottrich commented on DROOLS-396:
---------------------------------------

I had the same issue, and determined that it was caused by attempting to use Spring to inject a rules engine into a class that had other dependencies autowired in -- as in, the rules engine was not autowired in, but all of the other dependencies were.  In our Spring XML config, I had:

<bean id="myBean" class="com.example.myBeanImpl" scope="request">
	<aop:scoped-proxy />
	<property name="rulesEngine" ref="rulesEngineDef" />
</bean>

I think the {{<aop:scoped-proxy />}} was causing it to try to set dependencies with different scopes.

*The fix for me was to put all dependencies into the XML config, and not mix and match autowire and XML*:

<bean id="myBean" class="com.example.myBeanImpl" scope="request">
	<aop:scoped-proxy />
	<property name="otherDependency" ref="otherDependencyDef" />
	...
	<property name="rulesEngine" ref="rulesEngineDef" />
</bean>

> Caused by: java.lang.NoClassDefFoundError: org/drools/event/DebugProcessEventListener
> -------------------------------------------------------------------------------------
>
>                 Key: DROOLS-396
>                 URL: https://issues.jboss.org/browse/DROOLS-396
>             Project: Drools
>          Issue Type: Bug
>    Affects Versions: 6.0.0.Final
>            Reporter: leonardo lizana
>            Assignee: Petr Široký
>            Priority: Critical
>         Attachments: noclassdeffound.zip
>
>
> I'm trying to testing latest version of drools 6.0.1.Final version and i have the issue of  " java.lang.NoClassDefFoundError: org/drools/event/DebugProcessEventListener" . However, i can see class is now on the  the following path "org.drools.core.event.DebugProcessEventListener" and why the context is seeking in  org/drools/event/DebugProcessEventListener. instead of "org.drools.core.event.DebugProcessEventListener"
> is there anything that i'm doing bad?
> * with drools 5.5 everything is working OK.
> Here is my pom.xml
> --------------------------
> <dependency>
> 			<groupId>org.drools</groupId>
> 			<artifactId>knowledge-api</artifactId>
> 			<version>${drools.version}</version>
> 		</dependency>
> 		<dependency>
> 			<groupId>org.drools</groupId>
> 			<artifactId>drools-core</artifactId>
> 			<version>${drools.version}</version>
> 		</dependency>
> 		<dependency>
> 			<groupId>org.drools</groupId>
> 			<artifactId>drools-compiler</artifactId>
> 			<version>${drools.version}</version>
> 		</dependency>
> 		<dependency>
> 			<groupId>org.drools</groupId>
> 			<artifactId>drools-spring</artifactId>
> 			<version>5.5.0.Final</version>
> 		</dependency>
> here is the log error:
> ----------------------------
> Caused by: java.lang.NoClassDefFoundError: org/drools/event/DebugProcessEventListener
> 	at org.drools.container.spring.namespace.KnowledgeSessionDefinitionParser.parseInternal(KnowledgeSessionDefinitionParser.java:115)
> 	at org.springframework.beans.factory.xml.AbstractBeanDefinitionParser.parse(AbstractBeanDefinitionParser.java:59)
> 	at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)
> 	at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1338)
> 	at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1328)
> 	at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:135)
> 	at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:93)
> 	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
> 	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
> Here is the contex-drools.xml
> -------------------------------------
> <beans xmlns="http://www.springframework.org/schema/beans"
>     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>     xmlns:context="http://www.springframework.org/schema/context"
>     xmlns:drools="http://drools.org/schema/drools-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/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
>     http://drools.org/schema/drools-spring http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-container/drools-spring/src/main/resources/org/drools/container/spring/drools-spring-1.2.0.xsd"
>     default-autowire="byName">
>      
>   <drools:resource id="rulesEnergyUsage" type="DRL" source="classpath:com/aepenergy/b2b/miscpull/rules/rulesEnergyUsage.drl"/>
>   <drools:kbase id="kBaseEnergyUsage">
>     <drools:resources>
>       <drools:resource ref="rulesEnergyUsage"/>
>     </drools:resources>
>   </drools:kbase>
>   <drools:ksession id="kSessionEnergyUsage"  kbase="kBaseEnergyUsage" type="stateful"/>
>  </beans>



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