Instructions in Export-Package that are never used

Problem

The Maven BND plugin does not add a package to the MANIFEST.MF of a bundle although the bundle is declared as exported package in the pom.xml

<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<extensions>true</extensions>
<configuration>
<instructions>
<Bundle-SymbolicName>${pom.artifactId}</Bundle-SymbolicName>
<Bundle-Version>${pom.version}</Bundle-Version>
<Import-Package>${module.importedPackages}</Import-Package>
<Export-Package>de.linnk.application</Export-Package>
<Service-Component>${module.serviceDefinitions}
</Service-Component>
<Embed-Dependency>${module.embeddedDependencies}
</Embed-Dependency>
<Embed-Directory>target/dependency</Embed-Directory>
</instructions>
</configuration>
</plugin>

Maven reports in the output:

[WARNING] Warning building bundle de.linnk.fatclient:lnFatClient:bundle:0.0.1-SNAPSHOT : Instructions in Export-Package that are never used: de\.linnk\.application
[WARNING] Warning building bundle de.linnk.fatclient:lnFatClient:bundle:0.0.1-SNAPSHOT : Superfluous export-package instructions: [de.linnk.application]

Solution

Double check if all bundles declared under “Export-Package” really exist in the bundle. In my case, the packaged specified under “Export-Package” did not exist in the bundle. This can, for instance, happen after refactoring package names and forgetting to update the package names in the manifest (Thanks, royp).

The warning messages here could really be a little bit more explicit.