Processing ActiveMQ Messages with Apache Camel and JAVA

Question

I have a problem receiving AMQ-Messages in a JAVA-Method. I'm routing with a Camel-Route in Spring DSL like this:

<camel:route>
    <camel:from uri="activemq:foo.bar?maxConcurrentConsumers=1"/>
    <camel:to uri="bean:fooService?method=handleBarEvent"/>
</camel:route>

My JAVA-Code looks like:

package my.company.service

import org.apache.activemq.Message;
import org.apache.log4j.Logger;

public class FooService {
    private static final Logger LOG = Logger.getLogger(FooService.class);

    public void handleBarEvent(Message in) {
        LOG.info(in);
    }

    public void handleOtherEvent(Message in) {
        LOG.info(in);
    }
}

Now if I put a String -based Message into the AMQ, I get the following Error from Camel:

org.apache.camel.component.bean.AmbiguousMethodCallException: Ambiguous method invocations possible: [
  public void my.company.service.FooService.handleBarEvent(org.apache.activemq.Message),
  public void my.company.service.FooService.handleOtherEvent(org.apache.activemq.Message)
]

Why is Camel not calling the defined handleBarEvent -Method?

What type must the Method accept as input to get the whole AMQ-Message?

I tried to change the Method to public void handleBarEvent(Object in) but then the Method just gets the String -Body, without the Message-Headers.

Thanks for your help!

Answer 1

you can use the Exchange -Class as the parameter handleBarEvent(Exchange exchange) and Camel will pass the full message/headers as expected...

• exchange.getIn().getBody() to get the message body
• exchange.getIn().getHeader([headerName]) to get a header value, etc

also, you can use bean binding in more explicit ways to bind body/headers to parameters directly like this...

public String hello(String name, @Header("country") String country) {
    return "Hello " + name + " you are from " + country;
}