At work I am getting this error intermittently. I have designed a simple test case the same as the one I am using at work. For some reason it was working and then for no reason I can fathom it started failing with 'Dispatcher has no subscribers' . The only thing I can think is that something is being brought up in the wrong order. Here is the test

JaxB annotated object with getters setters etc omitted

Code:
@XmlRootElement(name = "object")
public class MyObject implements Serializable{

	private static final long serialVersionUID = -5373141442895674583L;
	private String value1;
	private String value2;
}
Annotated Service taking the object as a parameter

Code:
@MessageEndpoint
public class MyService {

	@ServiceActivator
	public void myMethod (MyObject val){
		System.out.println(val);
	}
}
The test case which should output hello world

Code:
@ContextConfiguration(locations = {"classpath:/jms-test-int.xml"})
@RunWith(SpringJUnit4ClassRunner.class)
public class MyServiceTest {

	@Autowired
	private MessageChannel toJMS;
	
	@Test
	public void test() {
		MessagingTemplate template = new MessagingTemplate();
		template.convertAndSend(toJMS, new MyObject("hello", "world"));
	}

}
Lastly the configuration

Code:
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:int="http://www.springframework.org/schema/integration"
	xmlns:int-jms="http://www.springframework.org/schema/integration/jms"
	xsi:schemaLocation="http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
		http://www.springframework.org/schema/integration/jms http://www.springframework.org/schema/integration/jms/spring-integration-jms.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
		
	<int:channel id="toJMS"/>

	<int-jms:outbound-channel-adapter channel="toJMS" destination-name="com.sample.jms" message-converter="marshallingMessageConverter"/>

	<int-jms:message-driven-channel-adapter channel="fromJMS" destination-name="com.sample.jms" message-converter="marshallingMessageConverter"/>

	<int:channel id="fromJMS" />
	
	<int:service-activator input-channel="fromJMS" ref="myService"/>
	
	<bean id="myService" class="com.sample.jms.MyService"/>


	<bean id="connectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
		<property name="brokerURL" value="vm://localhost"/>
	</bean>
	
	<bean id="marshallingMessageConverter" class="org.springframework.jms.support.converter.MarshallingMessageConverter">
		<property name="unmarshaller" ref="jaxbMarshaller" />
		<property name="marshaller" ref="jaxbMarshaller" />
	</bean>
	
	<bean id="jaxbMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller" >
		<property name="packagesToScan">
			<list>
				<value>com.sample.jms</value>
			</list>
		</property>
	</bean>
			
</beans>
Now I have not been able to reproduce this error here on my home pc (powerful linux box) but on my slower Windows XP machine at work it is failing intermittently. When I left today it was failing consistently until I removed the message-converters and just changed the service activator to take a string argument. Has anyone run into this before?

Thanks,
Bill