Is it possible to extend generic extension without messing the source codes?

[deceits]

System information:

• Operating system (distribution) and version
  Windows 10, JDK 1.8, Eclipse RCP 2020-03
• DBeaver version
  7,1

Connection specification:

• Database name and version
  H2 (2019-10)

Describe your question:

I want to extend the functions of Generic extension in DBeaver without messing
the source codes, so I am trying to create a new extension in DBeaver. The steps I took are following:

1. Copy-and-paste in org.jkiss.dbeaver.ext.h2 to a new project say org.jkiss.dbeaver.ext.demo

2. Refactored the class and package names from h2 to demo

3. Update pom.xml

4. Update plugin.xml

5. Update MANIFEST.MF

6. Move the demo project from workspace to DBeaver/plugins directory

7. Refresh DBeaver/plugins. The new demo plugin project will show up.
   Right-click and select Import as Project

8. Make sure everything compile.

9. Add new module entry for demo plugin in DBeaver plugin/pom.xml

10. Finally, register demo plugin to plugin.xml in generic extension package

To test it out I started DBeaver from Eclipse and create a new connection. In the database selection screen, I can see the Demo database that I created. Used it. Then in the JDBC setting screen, enter H2 JDBC setting (it is actually H2). I can connect and browse the H2 database. Everything seems to be fine.

Now I want to change the tree layout. I copied the dataSourceProvider extension (without drivers and driver-properties) in generic plugin.xml to demo extension and made some changes to it. Restart Dbeaver. The tree layout is not taking effects but always uses the layout in generic extension.

Is this the appropriate? What went wrong? Thanks .