Java Question Use Classes From External Jar

I have in Eclipse in Referenced Libraries for example test.jar . How can I use classes from this jar in my B4A Wrapper Code ?
I mean from Ads Networks SDK for example and so on.

I saw in xml - <objectwrapper> Package. How to generate it ? I cannot understand how for example download external SDK then ADD to referenced libraries in Eclipse and use classes from that in my B4A Library code. I managed to do a little library based on tutorial. But what about external Jars ?
Thanks

1. In Eclipse you should add a reference to the other Jar (under Project properties).
2. Add @DependsOn annotation. This tells B4A IDE to add a reference to the other jar.