AbstractBndMavenPlugin makes the (wrong) assumption that the file extension is always the packaging type, while this is true for some (e.g. jar/war) this is not generally true.

Instead BND should query the org.apache.maven.artifact.handler.manager.ArtifactHandlerManager e.g.

public String getExtension(String packaging) {
    if (packaging == null) {
        return "jar";
    }
    ArtifactHandler handler = artifactHandlerManager.getArtifactHandler(packaging);
    return handler.getExtension();
}