OSGi NPE bei deklarativen Bundle mit Maven SCR

[FilterPunk]

Ich bin OSGi Anfänger und versuche mich an einem Beispielcose ähnlich diesem Tutorial.

Hie ist der Code (habe den Code der Netbeans-Projekte auch angehängt)

1.) Netbeans Maven OSGi Bundle Project "MavenHelloService OSGi Bundle"
1.a) Interface HelloService.java in com.joerg.mavenhelloservice.api

     public interface HelloService {
          public String sayHello(String name);
     }

1.b) Installer.java

      public class Installer implements BundleActivator {
          @Override
           public void start(BundleContext context) throws Exception {
               String userName = context.getProperty("user.name");
               System.out.println("User Name: " + userName);
           }
      …

1.c) Implematation HelloImpl.java

      public class Installer implements BundleActivator {
          @Component(name="hello-service")
          @Service
          public class HelloImpl implements HelloService {
              @Override
              public String sayHello(String name) {
                  return "Hello " + name;
              }
          }

2.) Netbeans Maven OSGi Bundle Project "HelloClient OSGi Bundle"
2.a) Activator.java

      @Component(name="hello-service-consumer")
      public class Activator implements BundleActivator {
          @Reference
          private HelloService helloService;
          @Override
          public void start(BundleContext context) throws Exception {
              System.out.println(helloService.sayHello("Duke"));
          }
     …

3.) The Maven SCR Plugins generates following XML Files in the jars.
3.a) In MavenHelloService-1.0-SNAPSHOT.jar serviceComponents.xml:
[XML]<?xml version="1.0" encoding="UTF-8"?><components xmlns:scr="http://www.osgi.org/xmlns/scr/v1.0.0">
<scr:component enabled="true" name="hello-service">
<implementation class="com.joerg.mavenhelloservice.HelloImpl"/>
<service servicefactory="false">
<provide interface="com.joerg.mavenhelloservice.api.HelloService"/>
</service>
<property name="service.pid" value="hello-service"/>
</scr:component>
</components>[/XML]
3.b) In HelloClient-1.0-SNAPSHOT.jar serviceComponents.xml:
[XML]<?xml version="1.0" encoding="UTF-8"?><components xmlns:scr="http://www.osgi.org/xmlns/scr/v1.0.0">
<scr:component enabled="true" name="hello-service-consumer">
<implementation class="com.joerg.helloclient.Activator"/>
<property name="service.pid" value="hello-service-consumer"/>
<reference name="helloService" interface="com.joerg.mavenhelloservice.api.HelloService" cardinality="1..1" policy="static" bind="bindHelloService" unbind="unbindHelloService"/>
</scr:component>
</components>[/XML]

I use following software versions:
Netbeans 7.2 on Mac OS X 10.8.1 with Oracle Java 1.7.0_06 (64bit)
Maven 4.17.1 (installed with Netbeans)
Apache Felix Framework 3.0.7 (as Dependency for Service and Client)
Apache Felix Annotations 1.6.0 (as Dependency for Service and Client)
Maven SCR Plugin 1.7.4 (added to pom.xml for Service and Client)
Apache Felix Framework 4.0.3 (on Terminal as OSGi playground)

In Terminal I start felix "java -jar /bin/felix.jar" and install+start bundles:
start file:/Volumes/workspace/MavenHelloService/target/MavenHelloService-1.0-SNAPSHOT.jar
start file:/Volumes/workspace//HelloClient/target/HelloClient-1.0-SNAPSHOT.jar

When starting the HelloClient I get:
java.lang.NullPointerException
at com.joerg.helloclient.Activator.start(Activator.java:17)
at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:645)
at org.apache.felix.framework.Felix.activateBundle(Felix.java:1977)

Where Activator.java:17 is: System.out.println(helloService.sayHello("Duke"));

Am I missing anything? Or are my scr declarations wrong?

 

[VfL_Freak]

Moin,

Where Activator.java:17 is: System.out.println(helloService.sayHello("Duke"));
Am I missing anything? Or are my scr declarations wrong?

nun, dann wird "helloService" hier wohl NULL sein ......
Schon mal den Debugger angeworfen ???:L

Gruß
Klaus

 

[maki]

nun, dann wird "helloService" hier wohl NULL sein ......
Schon mal den Debugger angeworfen ???:L

Hi,

dieser Rat ist nutzlos, das ist jedem klar der schon mal mit OSGi + DS gearbeitet hat

@TS
Ein Bundleactivator gleichzeitig zu einer Komponente zu erheben kann gar nicht gehen, steht auch so nirgends im Beispiel

Mach doch mal ein Interface + eine Implementierung und nutze das als deklerativen Service.