B4J Question Simpile library compiler missing some packages

Does the slc uses java 7?

It has nothing to do with Java 7.

You posted this question in B4J forum and the mentioned class is an Android class. Are you creating a B4A library?

Yes my bad, i am building android library

The best tip that I can give you: don't create a 100% Java library unless you must. B4X libraries are much cooler and if you need Java then it is usually simpler to use inline java or JavaObject.

You need to find the dependent jars and add them to SLC. Example: C:\Android\extras\b4a_remote\androidx\core\core\1.3.2\unpacked-core-1.3.2\jars\classes.jar