On 3/11/10 14:57, Leon668 wrote:
Thanks Richard,
What you proposed do helps.
But I figured out that my problem was more than that,
It was the because the name of the references:
in the Upnp TV example, they registered the service like this:
serviceRegistration = context.registerService(UPnPDevice.class
.getName(), tvDev, dict);
However, while I was referring to the service, I used the
TvDevice.class.getName();
in which made me could not find the service.
tvref = context.getServiceReference(
TvDevice.class.getName()); TvDevice tvd =
(TvDevice)context.getService(tvref);
I changed my code to :
tvref = context.getServiceReference(
*UPnPDevice*.class.getName());
TvDevice tvd = (TvDevice)context.getService(tvref);
Then it works.
However, one more problem proposed was that because it looks like that there
might be more than one service references that with the name: *
PnPDevice.class.getName();
*
So, still I have the problem in identifying the class.
if I deploy two services with the same name, I can only get the first one.
Well, if you use getServiceReferences(), then you will get them all.
-> richard
Hope what I said make sense to you.
Thanks a lot
Leon.
On Thu, Mar 11, 2010 at 11:59 AM, Richard S. Hall<he...@ungoverned.org>wrote:
On 3/11/10 13:05, Leon668 wrote:
Hi,
I am trying to do some experiments of invoking another service in one
bundler by searching for their references.
My code and my pom.xml are as follows, it can pass the compilation
however,
it cannot be started after I deployed the jar file into the felix runtime.
However, the service my code invoked is correctly running at felix.
It looks like the bundle is being started as part of framework startup
since it is running on the Start Level thread. If so, there could be an
ordering issue. Maybe your service provider bundle isn't started up yet. You
should consider using a ServiceTracker or listening for service events.
Never just assume the service is there.
-> richard
Thanks a lot.
The error message shows:
-> [INFO] Started bridged http service
[INFO] Started bridged http service
[INFO] Http service whiteboard started
[INFO] Detected extended HttpService. Filters enabled.
*INFO * org.apache.felix.webconsole.internal.compendium.ComponentsServlet
not enabled. Reason: Class org.apache.felix.scr.ScrService missing
[INFO] Started jetty 6.1.x at port 8080
ERROR: Error starting
file:/home/user/Desktop/jar/felix-framework-2.0.3/bundle/org.apache.felix.upnp.sample.workflow-0.1.0-SNAPSHOT.jar
(org.osgi.framework.BundleException: Activator start error in bundle
org.apache.felix.upnp.sample.workflow [93].)
java.lang.NullPointerException: Specified service reference cannot be
null.
at
org.apache.felix.framework.BundleContextImpl.getService(BundleContextImpl.java:320)
at
org.apache.felix.upnp.sample.workflow.Activator.doServiceRegistration(Activator.java:44)
at
org.apache.felix.upnp.sample.workflow.Activator.start(Activator.java:54)
at
org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:661)
at org.apache.felix.framework.Felix.activateBundle(Felix.java:1756)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1678)
at
org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1124)
at
org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl.java:264)
at java.lang.Thread.run(Thread.java:619)
===============
package org.apache.felix.upnp.sample.workflow;
import java.util.Dictionary;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.apache.felix.upnp.sample.tv.*;
public class Activator implements BundleActivator {
static BundleContext context;
private ServiceReference tvref;
private void doServiceRegistration() {
tvref =
context.getServiceReference(TvDevice.class.getName());
TvDevice tvd = (TvDevice)context.getService(tvref);
tvd.setMessage("hello world!");
}
/**
* @see
org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
*/
public void start(BundleContext context) throws Exception {
Activator.context = context;
doServiceRegistration();
}
/**
* @see
org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
*/
public void stop(BundleContext context) throws Exception {
context.ungetService(tvref);
}
}
==================
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"; xmlns:xsi="
http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="
http://maven.apache.org/POM/4.0.0
http://maven.apache.org/maven-v4_0_0.xsd";>
<parent>
<artifactId>felix-parent</artifactId>
<groupId>org.apache.felix</groupId>
<version>1.2.0</version>
<relativePath>../../../pom/pom.xml</relativePath>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.upnp.sample.workflow</artifactId>
<packaging>bundle</packaging>
<name>Apache Felix UPnP Sample workflow</name>
<version>0.1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<extensions>true</extensions>
<configuration>
<instructions>
<Bundle-Name>${pom.name}</Bundle-Name>
<Bundle-Vendor>The Apache Software Foundation</Bundle-Vendor>
<Bundle-Author> someone</Bundle-Author>
<Bundle-Description>test workflow</Bundle-Description>
<Bundle-SymbolicName>org.apache.felix.upnp.sample.workflow</Bundle-SymbolicName>
<Bundle-Activator>org.apache.felix.upnp.sample.workflow.Activator</Bundle-Activator>
<Private-Package>org.apache.felix.upnp.sample.workflow.*</Private-Package>
<Import-Package>*</Import-Package>
</instructions>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>${pom.groupId}</groupId>
<artifactId>org.osgi.core</artifactId>
<version>1.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>${pom.groupId}</groupId>
<artifactId>org.osgi.compendium</artifactId>
<version>1.0.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.upnp.sample.tv</artifactId>
<version>0.2.0-SNAPSHOT</version>
<scope>provided</scope>
</dependency>
</dependencies>
</project>
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