Although the DB2 plug-in had worked many years ago, it currently failed completely when selecting DB2 from the "Add Layer" dialog.
By debugging with Eclipse I've been able to fix most of the problems, select tables to be displayed and display them once the project is re-opened. Obsolete commented-out code has been removed, spellings fixed and some comments added.
There are still some problems selecting features from multiple schemas but I would like to have the current fixes integrated if they are acceptable.
Many thanks David! Does the fix changes the UI of the wizard page (http://udig.github.io/docs/user/reference/DB2%20page.html) or the workflow how to add data (http://udig.github.io/docs/user/tasks/Adding%20Features%20from%20DB2.html)?
I assume the preferences and suggested jar-Names (http://udig.github.io/docs/user/reference/Catalog%20Preferences.html#preferences-page-catalog-db2) are still valid, aren't they?