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JTree vertical scrollbars not working

I have a JTree embedded in a JScrollPane. When the JTree grows bigger than the display can show, the remainder of the tree is located at the bottom outside of the visible range. I expected the JScrollPane to start displaying vertical scrollbars if this happens so that you can scroll the remainder into view. The vertical scrollbars do not appear at all if the JTree is expanded and doesn't fit. Here is how it looks like:
I have both, the horizontal and vertical scrollbarPolicy set to as needed. I also tried embedding the JScrollPane containing the JTree into a JPanel but it didn't help. I'm using the UI designer in IntelliJ IDEA to build the GUI by the way.
Any help on making the vertical scrollbars behave as expected? Forcing them to be shown at all times also doesn't work: They cannot be dragged down regardless.

not use preferredSize.
in UI designer choos JTree element, find property preferredSize and in context menu select Restore default value

JScrollPane scroll on the top page when the submit button click

Is it possible in Java Netbeans for the jScrollPanel to scroll automatically return to te top when a submit button click? Any idea?

You can use the JScrollPane's JViewport's setViewPosition to change the position of the top/left corner of the view.
See How to Use Scroll Panes for more details

Scrollable windows

I want scrollable panes.
Please, have a look at the picture
As you can see at the Navigator, I used Tabbed Pane, then placed Scroll Panes on it. Then placed Panel on it. And then added Lables. Looks like I'm trying to reach my left ear with my right foot. But without the jPanel1 my lable occupied the whole panel size.
Well now my scrollable panel doesn't work well.
It is visible at this .
Well, I made the window narrow. But the scroll bar at the bottom doesn't allow me to reach what is behind the border further on the right. And this scrollbar seems strange. It has only t left arrow. No right one. And no vertical scroll bar if I make the window less high.
Could you give me a hint how to make scrollable windows?

I'm not sure what you're doing wrong this is the results I get when I do only this and nothing more.
Drag and drop a tabbed pane to the frame
Drag and drop a scroll pane to the tabbed pane
Drag and drop a panel to the scroll pane
Drag and drop a label to the panel, and another label to the bottom.
Resize to smaller frame and scroll bars appear
Navigator Window

java panel layout dock

I'm having problem with the "dock" in java panel. I have UI like
the panel has a slide bar, a button and a scroll view, i.e. the while area above, with GirdBagLayout, (I also tried BorderLayout but won't work either). below it is another panel, both panel are placed in a parent panel with GridBagLayout.
When I click the "more" button, I want to extend the height of the panel to 3*original height to let the scrollview show more stuff vertically. and of course I want the slide bar and button still at the bottom of the panel. I call resize on the panel but I got this:
it shows that the scrollview is longer than before but was cut, and the bar and button remain at the same place. and my question is how I can put the slide bar and button always at the botton of the panel and show the scrollview correctly.

well, answer to my own question:
have to set up the layout again and call revalidate() and repaint().

Vertical scrollpane problem in jdialog

i have a question regarding the vertical scrollpane in jdialog.when i run My application the jdialog vertical scrollbar displays end of the data.I need to scroll it upwards.How can i get the scrollbar bydefault at the top.

JViewport#scrollRectToVisible()

What are you scrolling? If a text component, oftentimes setting the caret to the top of the component works. Please have a look at Rob Camick's Swing tips blog for more on this: Java Tips Weblog: Text Area Scrolling