[jboss-user] [JBoss Messaging] - Re: Single MDB Instance Required

[mirabis]

please ignor the above post. Some xml tags are deleted. the following is the correct one:

i am developing an Event Driven architecture using j2ee (MDB) on JBoss. In this Architecture the incoming business events (raw events) will be fetched by a MDB, wich forward the raw events to Event Stream Processor. My Problem is that JBoss instantiate multiple instances of my MDB. It means the same event will be delivered repeatedly. I just tried to force JBoss to limit the number of MDB instances. But it was useless. My jboss.xml look like this:

  | <?xml version="1.0"?>
  | <!DOCTYPE jboss PUBLIC
  |           "-//JBoss//DTD JBOSS 3.2//EN"
  |           "http://www.jboss.org/j2ee/dtd/jboss_3_2.dtd">
  | <!-- The jboss.xml descriptor for the jrmp-comp.jar ejb unit -->
  | <jboss>
  |     <enterprise-beans>
  | 		<message-driven>
  | 			<ejb-name>EventInputAdapterBean</ejb-name>
  | 			<destination-jndi-name>topic/rawEventTopic</destination-jndi-name>
  | 			<configuration-name>Standard Message Driven Bean</configuration-name>
  | 			
  | 			<invoker-bindings>
  | 				<invoker>
  | 					<invoker-proxy-binding-name>event-message-driven-bean</invoker-proxy-binding-name>
  | 				</invoker>
  | 			</invoker-bindings>
  | 		</message-driven>
  | 		<message-driven>
  | 			<ejb-name>ComplexEventInputAdapterBean</ejb-name>
  | 			<destination-jndi-name>topic/complexEventTopic</destination-jndi-name>
  | 			<configuration-name>Standard Message Driven Bean</configuration-name>
  | 			<invoker-bindings>
  | 				<invoker>
  | 					<invoker-proxy-binding-name>event-message-driven-bean</invoker-proxy-binding-name>
  | 				</invoker>
  | 			</invoker-bindings>
  | 		</message-driven>
  |     </enterprise-beans>
  |     
  | 	<invoker-proxy-bindings>
  | 		<invoker-proxy-binding>
  | 			<name>event-message-driven-bean</name>
  | 			<invoker-mbean>default</invoker-mbean>
  | 			<proxy-factory>org.jboss.ejb.plugins.jms.JMSContainerInvoker</proxy-factory>
  | 			<proxy-factory-config>
  | 				<JMSProviderAdapterJNDI>DefaultJMSProvider</JMSProviderAdapterJNDI>
  | 				<ServerSessionPoolFactoryJNDI>StdJMSPool</ServerSessionPoolFactoryJNDI>
  | 				<MaximumSize>1</MaximumSize>
  | 				<MaxMessages>1</MaxMessages>
  | 				<MDBConfig>
  | 					<ReconnectIntervalSec>10</ReconnectIntervalSec>
  | 					<DLQConfig>
  | 						<DestinationQueue>queue/DLQ</DestinationQueue>
  | 						<MaxTimesRedelivered>10</MaxTimesRedelivered>
  | 						<TimeToLive>0</TimeToLive>
  | 					</DLQConfig>
  | 				</MDBConfig>
  | 			</proxy-factory-config>
  | 		</invoker-proxy-binding>
  | 	</invoker-proxy-bindings>
  | 
  | </jboss>
  | 

i also made some changes in conf/jbossstandard.xml. The referenced configuration "Standard Message Driven Bean" like following: 

  |     <container-configuration>
  |       <container-name>Standard Message Driven Bean</container-name>
  |       <call-logging>false</call-logging>
  |       <invoker-proxy-binding-name>message-driven-bean</invoker-proxy-binding-name>
  |       <container-interceptors>
  |         <interceptor>org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor</interceptor>
  |         <interceptor>org.jboss.ejb.plugins.LogInterceptor</interceptor>
  |         <interceptor>org.jboss.ejb.plugins.RunAsSecurityInterceptor</interceptor>
  |         <!-- CMT -->
  |         <interceptor transaction="Container">org.jboss.ejb.plugins.TxInterceptorCMT</interceptor>
  |         <interceptor transaction="Container">org.jboss.ejb.plugins.CallValidationInterceptor</interceptor>
  |         <interceptor transaction="Container">org.jboss.ejb.plugins.MessageDrivenInstanceInterceptor</interceptor>
  |         <!-- BMT -->
  |         <interceptor transaction="Bean">org.jboss.ejb.plugins.MessageDrivenInstanceInterceptor</interceptor>
  |         <interceptor transaction="Bean">org.jboss.ejb.plugins.MessageDrivenTxInterceptorBMT</interceptor>
  |         <interceptor transaction="Bean">org.jboss.ejb.plugins.CallValidationInterceptor</interceptor>
  |         <interceptor>org.jboss.resource.connectionmanager.CachedConnectionInterceptor</interceptor>
  |       </container-interceptors>
  |       <instance-pool>org.jboss.ejb.plugins.MessageDrivenInstancePool</instance-pool>
  |       <instance-cache></instance-cache>
  |       <persistence-manager></persistence-manager>
  |       <container-pool-conf>
  |         <MaximumSize>1</MaximumSize>
  | 	 <strictMaximumSize>true</strictMaximumSize>
  | 
  |       </container-pool-conf>
  |     </container-configuration>
  | 
  | 
can you please tell me, what my mistake is.

thanks
Saeed


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