LDB file isnt deleted

[Scheuraa]

Hello,
i run the following Code:

String url = "jdbc:ucanaccess://" + dbPath + ";openExclusive=true;immediatelyReleaseResources=true;singleconnection=true";
        try
        {
            long startTime = new Date().toInstant().toEpochMilli();
            UcanaccessConnection con = (UcanaccessConnection)DriverManager.getConnection(url);
            long endTime = new Date().toInstant().toEpochMilli();
            System.out.println("Creating connection took: " + (endTime-startTime) + " ms");
            startTime = new Date().toInstant().toEpochMilli();
            Statement st = con.createStatement();
            st.execute("Select * from UDPDATA");
            endTime = new Date().toInstant().toEpochMilli();
            System.out.println("Statement took: " + (endTime-startTime) + " ms");
            st.close();
    } catch (SQLException e)
    {
        e.printStackTrace();
    }

And then my program ends. But the .ldb File is still there. I also already tried con.close() and con.unloadDB() booth didnt helped.