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From tony.x.ri...@jpmchase.com
Subject RE: active mq and tomcat 5.5
Date Fri, 19 Jan 2007 19:55:08 GMT
Hi Suchitha,

I've seen this sort of error when there is more than one ActiveMQ JAR in 
the classpath. This can happen if there is one version in 
$CATALINA_HOME/shared/lib, and different version included with your WAR 
file. In this situation the resource in JNDI will have been created using 
the shared JAR, but your application is expecting an object created using 
the JAR bundled with your web application. Even though they share the same 
package name Java will complain with a ClassCastException. This may not be 
what's happening here, but it's a possible explanation.

Hope this helps,

- Tony




"Suchitha Koneru \(sukoneru\)" <sukoneru@cisco.com> 
01/19/2007 02:36 PM
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activemq-users@geronimo.apache.org


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Subject
RE: active mq and tomcat 5.5






Thanks for your response , I tried using the latest version of activemq
jars (i.e 4.1)
The class of the object being returned 
Is 
org.apache.activemq.ActiveMQConnectionFactory.
I tried casting it to this type as well, but still I get the class cast
exception 

java.lang.ClassCastException:
org.apache.activemq.ActiveMQConnectionFactory
        at
com.cpnm.common.messaging.PNMSubscriber.<init>(PNMSubscriber.java:45)

I am not sure , as to what is going worng. 



-----Original Message-----
From: Adrian Co [mailto:aco@exist.com] 
Sent: Friday, January 19, 2007 11:11 AM
To: activemq-users@geronimo.apache.org
Subject: Re: active mq and tomcat 5.5

Have you tried using the 4.1 jars?

What is the class of the object being returned?

Suchitha Koneru (sukoneru) wrote:
> Hello active mq users ,
>
> is there any good tutorial, which will explain configuring active mq 
> on tomcat 5.5 ? I am running into the following issue.
>
> I have the following configuration on my system
>
> tomcat 5.5
>
> java 1.5.09
>
> activemq jars version 4.0
>
> The active MQ broker is started  , from the application . 
>
> the code for it is
>
> public void contextInitialized(ServletContextEvent arg0) {
>
> try{
>
> System.out.println("Starting ActiveMQ Broker Service...");
>
> broker.addConnector("tcp://localhost:61616?trace=true");
>
> broker.start();
>
> System.out.println("Active MQ Broker Started at local host port 
> 61616");
>
> }catch(Exception e){
>
> System.err.println(e.getMessage());
>
> e.printStackTrace();
>
> throw new RuntimeException(e);
>
> }
>
> }
>
> 
>
> In server.xml , I placed the JNDI resources as follows 
> <GlobalNamingResources>
>
> <Resource name="jms/TopicConnectionFactory" 
>
> auth="Container" 
>
> type="org.apache.activemq.ActiveMQConnectionFactory" 
>
> description="JMS Connection Factory"
>
> factory="org.apache.activemq.jndi.JNDIReferenceFactory" 
>
> brokerURL="tcp://localhost:61716" 
>
> brokerName="LocalActiveMQBroker"/>
>
> <Resource name="jms/Topic" 
>
> auth="Container" 
>
> type="org.apache.activemq.command.ActiveMQTopic" 
>
> description="sample Topic"
>
> factory="org.apache.activemq.jndi.JNDIReferenceFactory" 
>
> physicalName="FOO.BAR"/>
>
> </GlobalNamingResources>
>
> I have a web app called UI , I am trying to access these global jndi 
> recources from this web app, Hence the context.xml for this web app 
> has the following
>
> <Context reloadable="true">
>
> <ResourceLink
> name="ConnectionFactory"global="jms/TopicConnectionFactory" type= 
> "org.apache.activemq.ActiveMQConnectionFactory" />
>
> <ResourceLink name="PNMTopic" global="jms/Topic" type= 
> "org.apache.activemq.command.ActiveMQTopic" />
>
> </Context>
>
> The subsciber class in the UI context is as follows
>
> public class PNMSubscriber {
>
> TopicConnection tConn ;
>
> TopicConnectionFactory tFactory ;
>
> Topic pnmTopic;
>
> ActiveMQTopicSession pnmSession ;
>
> public PNMSubscriber(){
>
> try{
>
> InitialContext initialContext = new InitialContext();
>
> Context envContext = (Context) initialContext.lookup("java:comp/env");
>
> tFactory
> =(TopicConnectionFactory)envContext.lookup("ConnectionFactory");
>
> tConn = tFactory.createTopicConnection();
>
> pnmSession = (ActiveMQTopicSession) tConn.createTopicSession(true, 
> Session.AUTO_ACKNOWLEDGE);
>
> pnmTopic = (Topic)envContext.lookup("PNMTopic");
>
> pnmSubscriber = pnmSession.createSubscriber(pnmTopic);
>
> }catch(Exception e){
>
> e.printStackTrace();
>
> }
>
> }
>
> I get a class cast exception as follows
>
> java.lang.ClassCastException:
> org.apache.activemq.ActiveMQConnectionFactory
>
> at
> com.cpnm.common.messaging.PNMSubscriber.<init>(PNMSubscriber.java:40)
>
> The exception is raised , at the following line , in the code above.
>
> tFactory =
> (TopicConnectionFactory)envContext.lookup("ConnectionFactory");
>
> I tried casting the object to "ActiveMQConnectionFactory" , I still 
> get the same exception.
>
> I think, Iam missing something in the configuration, please let me 
> know, if I need to add anything else.
>
> thank you,
>
> Suchitha.
>
>
> 




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