Problem investigating JmDNS3.4.1 jar - osgi

Question

I'm newbie here. I'm dealing with my first program using osgi bundles and JmDNS. After adding JmDNS 3.4.1 jar to my project, I'm testing the following basic code:
My Activator:
package test.discoverservice;
import java.io.IOException;
import test.DiscoverServices;
import javax.jmdns.JmDNS;
import javax.jmdns.ServiceTypeListener;
import org.equinoxosgi.jmdns.dev.discoverservice.DiscoverServices.SampleListener;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
public class JmdnsActivator implements BundleActivator {
public void start(BundleContext context) throws Exception {
System.out.println("Launching");
try {
System.out.println("step 1");
final JmDNS jmdns = JmDNS.create();
System.out.println("step 2");
jmdns.addServiceListener("_http._tcp.local.", new SampleListener());
// jmdns.close();
// System.out.println("Done");
} catch (IOException e) {
e.printStackTrace();
}
}
public void stop(BundleContext context) throws Exception {
System.out.println("Terminating");
}
}
and here is the bundle:
package test.discoverservice;
import javax.jmdns.ServiceEvent;
import javax.jmdns.ServiceListener;
public class DiscoverServices {
static class SampleListener implements ServiceListener {
#Override
public void serviceAdded(ServiceEvent event) {
System.out.println("Service added : " + event.getName() + "." + event.getType());
}
#Override
public void serviceRemoved(ServiceEvent event) {
System.out.println("Service removed : " + event.getName() + "." + event.getType());
}
#Override
public void serviceResolved(ServiceEvent event) {
System.out.println("Service resolved: " + event.getInfo());
}
}
}
when I run the code, I get :
osgi> Launching
step 1
and then it stops, so I guess there is a probelm with the creation of the JmDNS instance..
Any idea please?
Note that if I don't use a bundle with an activator (simple program with main) everything works properly
import java.io.IOException;
import javax.jmdns.JmDNS;
import javax.jmdns.ServiceEvent;
import javax.jmdns.ServiceTypeListener;
public class DiscoverServiceTypes {
static class SampleListener implements ServiceTypeListener {
#Override
public void serviceTypeAdded(ServiceEvent event) {
System.out.println("Service type added: " + event.getType());
}
public void subTypeForServiceTypeAdded(ServiceEvent event) {
System.out.println("SubType for service type added: " + event.getType());
}
}
public static void main(String[] args) {
try {
JmDNS jmdns = JmDNS.create();
System.out.println("JmDNS created !!");
jmdns.addServiceTypeListener(new SampleListener());
// jmdns.close();
// System.out.println("Done");
} catch (IOException e) {
e.printStackTrace();
}
}
}
PS: I'm running it on Windows

Answer 1

You have to add the imported library in the classpath of the MANIFEST.MF file of the OSGI Framework if not already done.
Bundle-ClassPath: org.json.jar,
lib/jmdns-3.4.1.jar, ...
If you got the lirary from sourceforge check if the jar file is correct and no class is present twice in the jar. (If so, just use the .jar from Maven)