JSplitPane always jumps to center

I have a JSplitPane, which is split vertically. On the right i display textboxes and tables, which could be dragged to a new position by the user. Therefore i'm not using a layout manager and setting location and size for each component with setLocation and setBounds. But every time the user has dragged and dropped a component the right part of the SplitPane centers. With other words: The user goes to the right by using the horizontal scrollbar of the right part of the SplitPane. There he draggs and drops ie. a table to a new position. After dropping it the SplitPane jumps automatically back to the middle. Of course this should not happen. How can i avoid this?
Thanks,
Robert

Well, I'm guessing that you need to set the preferred size of the panel in the right side. This is normally done by the layout manager, but since you aren't using one...

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