问题
I've started developing a bundle for apache felix and did so with the ops4j pax plugin.
I've created the project structure with pax-create-project
and in there did the normal pax-create-bundle
. Then you get the initial project structure for building the whole thing with maven. The important part here is, that your bundle has it's own pom (bundlename/pom.xml
) and bnd file (bundlename/osgi.bnd
) but the configuration for maven-bundle-plugin
is already provided under poms/compiled/pom.xml
.
The bundle metadata is configured under poms/compiled/pom.xml
but the standard activator is configured under the above mentioned osgi.bnd
file. The default in the bnd file is Bundle-Activator: ${bundle.namespace}.internal.ExampleActivator
.
Now I wanted to start using annotations from org.apache.felix.scr
so I included this in the bundles own pom under dependencies:
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.scr</artifactId>
<version>1.6.0</version>
</dependency>
And I created my interface for the service:
package namespace;
public interface Sample {
void sayHello();
}
As well as the implementation with the annotations from org.apache.felix.scr
:
package namespace.internal;
import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Deactivate;
import namespace.Sample;
@Component
@Service
public class SampleImpl implements Sample{
@Activate
void start(){
System.out.println("Started SampleImpl.");
}
@Deactivate
void stop(){
System.out.println("Stopped SampleImpl.");
}
@Override
public void sayHello() {
System.out.println("Hello!");
}
}
What do I need to place in the osgi.bnd
file in order to start the components? I had to remove the default entry mentioned above because I`m not using the BundleActivator any more.
Now here is the question: What do I need to do to any of the above mentioned files in order to let the mvn clean install pax:provision
start up a felix environment that starts my bundle and let me see any of the printouts? I have already looked at the log output of the Apache Log Service which I'm starting too and it just tells me:
2012.09.28 16:52:44 INFO - Bundle: namespace - BundleEvent STARTED
2012.09.28 16:52:44 INFO - Bundle: namespace - BundleEvent RESOLVED
Any hints are very well appreciated. Or links, I've searched for more then hours to find a complete guide to use the maven plugins for scr and bundle together.
Greetings, Kjellski
回答1:
This is a modification of my coderwall writeup on this topic: http://coderwall.com/p/q39uxq
First configure the general compilation configuration of the submodules from poms/compiled/pom.xml. Add the plugin right where the maven-bundle-plugin already is:
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-scr-plugin</artifactId>
<version><timeofwriting:1.8.0></version>
<executions>
<execution>
<id>generate-scr-scrdescriptor</id>
<goals>
<goal>scr</goal>
</goals>
</execution>
</executions>
</plugin>
In the same file, under poms/compiled/pom.xml, look at the instructions for maven-bundle-plugin and add right under the <_include> statement:
<Service-Component>
OSGI-INF/serviceComponents.xml
</Service-Component>
Now depend on the annotations in the subprojects in order to use them:
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.scr</artifactId>
<version><timeofwriting:1.6.0></version>
</dependency>
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>
org.apache.felix.scr.annotations
</artifactId>
<version><timeofwriting:1.7.0></version>
</dependency>
Now define your components with annotations @Component and @Service. When you want none to be included, like in any api bundle, just insert "Service-Component: *" in the osgi.bnd file. This will cause the bundle plugin to stop complaining about the missing OSGI.INF for the project that doesn't contain any.
Hope this helps somebody ;)
Cheers, Kjellski
来源:https://stackoverflow.com/questions/12642706/how-to-use-org-apache-felix-scr-annotations-for-a-bundle-from-scratch