I am trying to learn how to use Felix iPOJO API to create components
dynamically.
I have a simple bundle with the following files:
1- HelloService.java (Contains a Service Interface).
/*
* @author zaid almahmoud
*
*/
package helloipojo.service;
public interface HelloService
{
public void sayHello();
}
2- Its implementation HelloServiceImpl.java:
package helloipojo;
import helloipojo.service.HelloService;
public class HelloServiceImpl implements HelloService{
@Override
public void sayHello() {
System.out.println("Hello iPojo!");
}
}
3- Activator.java :
package helloipojo;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
public class Activator implements BundleActivator {
public void start(BundleContext context) throws Exception {
System.out.println("Bundle Started!");
}
public void stop(BundleContext context) throws Exception {
context = null;
System.out.println("Bundle Stopped!");
}
}
MANIFEST.MF:
Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: HelloIPojo
Bundle-SymbolicName: HelloIPojo
Bundle-Version: 1.0.0.qualifier
Bundle-Activator: helloipojo.Activator
Bundle-RequiredExecutionEnvironment: JavaSE-1.6
Import-Package: org.osgi.framework
In my application, I start Felix framework and deploy the following bundles:
iPOJO (core)
iPOJO Composite
iPOJO API
According to this<http://felix.apache.org/site/apache-felix-ipojo-api.html>
source.
Next, I install my bundle, and instantiate the component. Below is my class:
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.felix.framework.Felix;
import org.apache.felix.framework.util.FelixConstants;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceRegistration;
import org.apache.felix.ipojo.ComponentInstance;
import org.apache.felix.ipojo.ConfigurationException;
import org.apache.felix.ipojo.MissingHandlerException;
import org.apache.felix.ipojo.UnacceptableConfiguration;
import org.apache.felix.ipojo.api.ComponentType;
import org.apache.felix.ipojo.api.PrimitiveComponentType;
import org.apache.felix.ipojo.api.Service;
public class HostApplication
{
private HostActivator m_activator = null;
private Felix m_felix = null;
public HostApplication()
{
// Create a configuration property map.
Map config = new HashMap();
config.put(Constants.FRAMEWORK_STORAGE_CLEAN,
Constants.FRAMEWORK_STORAGE_CLEAN_ONFIRSTINIT);
// Create host activator;
m_activator = new HostActivator();
List list = new ArrayList();
list.add(m_activator);
config.put(FelixConstants.SYSTEMBUNDLE_ACTIVATORS_PROP, list);
try
{
// Now create an instance of the framework with
// our configuration properties.
m_felix = new Felix(config);
// Now start Felix instance.
m_felix.start();
}
catch (Exception ex)
{
System.err.println("Could not create framework: " + ex);
ex.printStackTrace();
}
// Register the application's context as an OSGi service!
BundleContext bundleContext1 = m_felix.getBundleContext();
System.out.println("6");
try {
//starting ipojo required bundles
Bundle coreBundle =
bundleContext1.installBundle("file:C:\\Users\\zaid.almahmoud\\Dropbox\\EBTIC\\ADERE\\feasibility-codes\\ipojo\\ipojo-distribution-1.11.0\\bundle\\org.apache.felix.ipojo-1.6.2.jar");
coreBundle.start();
if(coreBundle.getState()== coreBundle.ACTIVE)
System.out.println("Core Bundle is Active!");
Bundle apiBundle =
bundleContext1.installBundle("file:C:\\Users\\zaid.almahmoud\\Dropbox\\EBTIC\\ADERE\\feasibility-codes\\ipojo\\ipojo-distribution-1.11.0\\bundle\\org.apache.felix.ipojo.api-1.6.0.jar");
apiBundle.start();
if(apiBundle.getState()== apiBundle.ACTIVE)
System.out.println("API Bundle is Active!");
Bundle compositeBundle =
bundleContext1.installBundle("file:C:\\Users\\zaid.almahmoud\\Dropbox\\EBTIC\\ADERE\\feasibility-codes\\ipojo\\ipojo-distribution-1.11.0\\bundle\\org.apache.felix.ipojo.composite-1.6.0.jar");
compositeBundle.start();
if(compositeBundle.getState()== compositeBundle.ACTIVE)
System.out.println("Composite Bundle is Active!");
//HERE INSTALLING AND STARTING MY BUNDLE!!
Bundle b =
bundleContext1.installBundle("file:C:\\Users\\zaid.almahmoud\\Desktop\\plugins\\HelloIPojo_1.0.0.201401211340.jar");
b.start();
try {
ComponentType type = new PrimitiveComponentType()
.setBundleContext(b.getBundleContext())
.setComponentTypeName("hello.type")
.setClassName("helloipojo.HelloServiceImpl")
.setImmediate(true);
type.start();
ComponentInstance instance = type.createInstance();
}
catch (UnacceptableConfiguration
| MissingHandlerException | ConfigurationException
e) {
// TODO Auto-generated catch block
e.printStackTrace();
} // Create the instance
System.out.println("done starting bundles!");
} catch (BundleException e) {
e.printStackTrace();
System.out.println("Not done!");
}
//shutdownApplication();
}
public Bundle[] getInstalledBundles()
{
// Use the system bundle activator to gain external
// access to the set of installed bundles.
return m_activator.getBundles();
}
public void shutdownApplication()
{
// Shut down the felix framework when stopping the
// host application.
try {
m_felix.stop();
} catch (BundleException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
m_felix.waitForStop(0);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
When I run my application, it shows the following output (with the error at the
end):
6
Core Bundle is Active!
API Bundle is Active!
Composite Bundle is Active!
Bundle Started!
Exception in thread "main" java.lang.IllegalStateException: The factory
associated with the component type is invalid (not started or missing handlers)
at
org.apache.felix.ipojo.api.ComponentType.ensureFactory(ComponentType.java:189)
at
org.apache.felix.ipojo.api.ComponentType.ensureAndGetFactory(ComponentType.java:177)
at
org.apache.felix.ipojo.api.ComponentType.createInstance(ComponentType.java:79)
at HostApplication.<init>(HostApplication.java:109)
at Embedder.main(Embedder.java:11)
Where did I go wrong? Thanks.
Update
I could see that I am missing 2 handlers. I knew that by adding the following
two lines:
System.out.println(type.getFactory().getRequiredHandlers());
System.out.println(type.getFactory().getMissingHandlers());
The output of the above two lines is:
[org.apache.felix.ipojo:architecture, org.apache.felix.ipojo:callback]
[org.apache.felix.ipojo:architecture, org.apache.felix.ipojo:callback]
I also tried:
type.getFactory().createComponentInstance(new Properties());
then I got:
org.apache.felix.ipojo.MissingHandlerException: Missing handlers :
org.apache.felix.ipojo:architecture org.apache.felix.ipojo:callback
I don't know why these handlers are missing. I tried to add them, but could not
figure out the right syntax. Any help? Thanks.
Zaid
