module-jni: error in dynamic class generation related to abstract base classes

[davidnich]

ex:

import qore.Qore.SQL.Datasource;
import qore.Qore.$Functions;

public class DsTest {
    public static void main(String[] args) throws Throwable {
        Datasource ds = new Datasource("jdbc:xxxx");
        Object results = ds.callMethod("selectRows", "select * from AUFTRAG where auftragnr = 10");
        $Functions.printf("rows: %N\n", results);
    }
}

error:

Exception in thread "main" java.lang.AbstractMethodError: Receiver class qore.Qore.SQL.Datasource does not define or inherit an implementation of the resolved method 'abstract java.lang.Object selectRows(java.lang.String)' of abstract class qore.Qore.SQL.AbstractDatasource.
	at QoreURLClassLoader//DsTest.main(DsTest.java:9)

related to #4738