cant start osgi bundle because import cannot be resolved

Question

I have made a small API Bundle and a service bundle that should use the API.

In my maven pom.xml file, i added a dependecy for my api bundle in the correct version like this:

<dependency>
  <groupId>at.foobar.osgi.api</groupId>
  <artifactId>foobarapi</artifactId>
  <version>1.0</version>
</dependency>

i'm using the maven-bundle plugin to create the bundles, and because of that i used mvn clean install to create by jar file. The Manifest looks like this (the service):

Manifest-Version: 1.0
Private-Package: at.foobar.osgi.producer
Built-By: foobar
Tool: Bnd-0.0.238
Bundle-Name: foobarproducer
Created-By: Apache Maven Bundle Plugin
Bundle-Version: 1.0
Build-Jdk: 1.6.0_26
Bnd-LastModified: 1332185439257
Bundle-ManifestVersion: 2
Bundle-Activator: at.foobar.osgi.producer.Activator
Import-Package: at.foobar.osgi.api,org.osgi.framework;version="1.4"
Bundle-SymbolicName: at.foobar.osgi.producer.foobarproducer

which seems to be OK for me. The import is in there, so everything should be fine.

now i started up equinox and installed the API and the producer bundle. Then i startet the API, which worked out fine. But when i want to start the Producer Service i get this error:

org.osgi.framework.BundleException: The bundle "at.foobar.osgi.producer.foobarproducer_1.0.0 [4]" could not be resolved. Reason: Missing Constraint: Import-Package: at.foobar.osgi.api; version="0.0.0"

It seems that the framework cannot find the api, but its installed and started?

Answer 1

Make sure that you are exporting the API packages, so that your service bundle can bind to them.

In your maven-bundle-plugin for the API bundle you should have something like:

            <configuration>
                <instructions>
                    <Import-Package>
                        *
                    </Import-Package>
                    <Export-Package>
                        at.foobar.osgi.api.*
                    </Export-Package>
                </instructions>
            </configuration>