Sounds like you've multiple jms API jars causing the
ClassCastException (ActiveMQConnectionFactory definitely is-a
ConnectionFactory :)
On 6/15/07, Rob Terpilowski <[EMAIL PROTECTED]> wrote:
Hello active mq users ,
I am running into the following issue that was posted on the mailing list in
January, but for which no
response was posted.
I have the following configuration on my system
tomcat 5.5
java 1.5.09
activemq jars version 4.1.1
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.
The active MQ jars are located in <catalina-home>/server/lib and I tried
putting them
under <catalina-home>/shared/lib as well with no difference
thank you,
-rob
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