i'm designing a database program using jdk1.4.1 and jdbcdbc

the design is that there will be a frame with menus such as
file ,edit ,display etc
When one clicks "edit" a combobox and a tabbedpane
appears .From the combo box one can select one of the tables of the database.
The tabbedpane contains tabs such as "viewTable ","QueryTable","Add" etc. to do operations on
the table selected from the combo box.

Compilation and exceptions of the code gave no promblem.

But when i select a table name from the combo box
the interface gets blocked and in the console there appears
a series of lines :


May be its a problem of threads .I don,tknow threads well.
Is there a way out,a solution or a different design without

if u ask i,l send the code.