This is working code I'm just wrapping to expose to B4A. I don't see anything in the code that would cause this. Eclipse builds a JAR without any warning/errors.
Note that it is better to only run the doclet on your code.
You can use the -b4aignore flag (in the javadoc properties) to ignore all classes starting with a given string.
For example:
B4X:
-b4aignore org,com.android,com.example
The above command will ignore all org.*, com.android.* and com.example.* packages.