How to include resource file into osgi bundle from jar dependency with bnd/maven-bundle-plugin?

You can use the maven-dependency-plugin to un-compress your dependencies jar and then include the resource in your jar.

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <executions>
        <execution>
            <id>unpack-dependencies</id>
            <phase>generate-resources</phase>
            <goals>
                <goal>unpack</goal>
            </goals>
            <configuration>
                <markersDirectory>${project.build.directory}/dependencies/dependency-maven-plugin-markers</markersDirectory>
                <artifactItems>
                    <artifactItem>
                        <groupId>DEPENDENCY_GROUPID</groupId>
                        <artifactId>DEPENDENCY_ARTIFACTID</artifactId>
                        <type>OPTIONAL_DEPENCENCY_TYPE</type>
                        <outputDirectory>${project.build.directory}/dependencies/DEPENDENCY_ARTIFACTID</outputDirectory>
                    </artifactItem>
                </artifactItems>
            </configuration>
        </execution>
    </executions>
</plugin>
...
<plugin>
    <groupId>org.apache.felix</groupId>
    <artifactId>maven-bundle-plugin</artifactId>
    <configuration>
        ...
        <instructions>
            ...
            <Include-Resource>target/dependencies/DEPENDENCY_ARTIFACTID/some.xml</Bundle-Activator>
        </instructions>
    </configuration>
</plugin>

The Include-Resource instructions is supposed to be pom relative, see Include-Resource, you can probably replace targetwith ${project.build.directory}.

If you have a file reference to the jar, you can do

-includeresource: @path/to/file.jar!/some.xml

You use the @ prefix to say the resource is in the jar and the !/ syntax from jar urls.

The tricky part will be getting a path to the jar from the project dependencies I suspect.