Problems to show a Vertical JScrollPane with JList

I have a JList within a JScrollPane, and update the JList with the output from a process.
This means that the JList is updated very quickly with a lot of data.
The scrollpane policy is set using this :
myScrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
The problem happens as the list is being updated - sometimes the slider on the scrollbar disappears. It can reappear again, but this behaviour seems completely random.
This means that if the process completes and the JList stops being updated, the lack of a slider prevents me from reviewing the JList contents.
Does anyone know why this happens and what I can do to prevent it?

JList displays the contents of a Vector. The Java version is JDK 1.2.2. And I'm using Windows 2000.

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Hi brian!
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Apple Retail Store - Genius Bar

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestJScrollPane {
static {
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    catch (Exception e) { }
private JFrame mainWindow;
public TestJScrollPane() {
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    mainWindow.pack();
    mainWindow.show();
public JFrame createMainWindow() {
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    JTextField stuffField = new JTextField(10);
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    gbc.gridx = 0;
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    gbc.gridx = 1;
    stuffPanel.add(stuffField, gbc);
    gbc.gridy = 1;
    gbc.gridx = 0;
    gbc.gridwidth = 2;
    stuffPanel.add(stuffButton, gbc);
    gbc.gridy = 2;
    gbc.fill = GridBagConstraints.BOTH;
    stuffPanel.add(listOfStuff, gbc);
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    gbc.weightx = 1;
    gbc.weighty = 1;
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      public void actionPerformed(ActionEvent e) {
        mainWindow.pack();
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        System.out.println("Scroller size: " + scroller.getSize());
        System.out.println("Scroller preferred size: " + scroller.getPreferredSize());
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public static void main(String[] args) {
    new TestJScrollPane();
}

Why would the JScrollPane be as big as the entire
frame when you added 800x600 panels on all sides of
it? It's going to be in the center surrounded by
huge panels. Thanks, kablair. However, if you look at the code, these panels are not 800x600 on all sides. The north and south panels only add a combined height of 100, and the east and west panels only add a combined width of 100. so the whole window, minus insets, should be 900x700.
Anyway, i took the advice of the guy above, and that has gotten me much closer. In the bigger app that I'm trying to calculate the size, now I'm only 2 pixels away from the true size, although I can't figure out what I'm forgetting.

My IMac is showing two vertical yellow liness

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Problem description: My iMac (early 2008) with OS 10.10.2 runs slow. I have run EtreCheck several times, and I am unable to move beyond Problem System Launch Agents (11 processes killed due to memory pressure) and Launch Daemons (12 processes killed

Problem description:
My iMac (early 2008) with OS 10.10.2 runs slow. I have run EtreCheck several times, and I am unable to move beyond Problem System Launch Agents (11 processes killed due to memory pressure) and Launch Daemons (12 processes killed).
EtreCheck version: 2.1.8 (121)
Report generated April 14, 2015 at 9:50:48 AM EDT
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
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    iMac - model: iMac8,1
    1 3.06 GHz Intel Core 2 Duo CPU: 2-core
    4 GB RAM Upgradeable
        BANK 0/DIMM0
            2 GB DDR2 SDRAM 800 MHz ok
        BANK 1/DIMM1
            2 GB DDR2 SDRAM 800 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
    NVIDIA GeForce 8800 GS - VRAM: 512 MB
        iMac 1920 x 1200
System Software: ℹ️
    OS X 10.10.2 (14C1510) - Time since boot: 4 days 20:29:22
Disk Information: ℹ️
    Hitachi HDS721010KLA330 disk0 : (1 TB)
        EFI (disk0s1) <not mounted> : 210 MB
        Mac iBook HD (disk0s2) / : 999.35 GB (521.60 GB free)
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
USB Information: ℹ️
    Apple Inc. Built-in iSight
    Apple, Inc. Keyboard Hub
        Apple, Inc Apple Keyboard
    Apple Computer, Inc. IR Receiver
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
Configuration files: ℹ️
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Gatekeeper: ℹ️
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Problem System Launch Agents: ℹ️
    [killed]    com.apple.CallHistoryPluginHelper.plist
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    [killed]    com.apple.coreservices.appleid.authentication.plist
    [killed]    com.apple.icloud.fmfd.plist
    [killed]    com.apple.Maps.pushdaemon.plist
    [killed]    com.apple.printtool.agent.plist
    [killed]    com.apple.SafariNotificationAgent.plist
    [killed]    com.apple.sbd.plist
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Problem System Launch Daemons: ℹ️
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    [killed]    com.apple.ifdreader.plist
    [killed]    com.apple.nehelper.plist
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    [killed]    com.apple.periodic-daily.plist
    [killed]    com.apple.periodic-weekly.plist
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    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [running]    com.adobe.AdobeCreativeCloud.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.adobe.SwitchBoard.plist [Click for support]
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    [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
    [loaded]    com.google.keystone.agent.plist [Click for support]
    [running]    com.spotify.webhelper.plist [Click for support]
User Login Items: ℹ️
    ChronoSyncBackgrounder    Application (/Library/Application Support/ChronoSync/ChronoSyncBackgrounder.app)
    Dropbox    Application (/Applications/Dropbox.app)
    Canon IJ Network Scanner Selector2    Application Hidden (/Library/Printers/Canon/IJScanner/Utilities/Canon IJ Network Scanner Selector2.app)
    Google Drive    Application (/Applications/Google Drive.app)
Internet Plug-ins: ℹ️
    Google Earth Web Plug-in: Version: 6.1 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    AdobeExManDetect: Version: AdobeExManDetect 1.1.0.0 - SDK 10.7 [Click for support]
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User internet Plug-ins: ℹ️
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3rd Party Preference Panes: ℹ️
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    Flash Player [Click for support]
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Time Machine: ℹ️
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Top Processes by CPU: ℹ️
         3%    WindowServer
         3%    Mail
         2%    com.apple.iCloudHelper
         1%    Creative Cloud
         1%    Google Chrome
Top Processes by Memory: ℹ️
    223 MB    Google Chrome
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    129 MB    Google Chrome Helper
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Virtual Memory Information: ℹ️
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    1.45 GB    Active RAM
    1.45 GB    Inactive RAM
    888 MB    Wired RAM
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    851 MB    Page-outs

When you see a beachball cursor or the slowness is especially bad, note the exact time: hour, minute, second.
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
The title of the Console window should be All Messages. If it isn't, select
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from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen.
Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.
Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.
Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.

I'm loathed to ask the same question again about the ITunes library not syncing with my iPod but having just done a complete restore, ensuring the tracks are in AAC format.. There are still problems.. Apple are there with the tutorials..but no solvings!!!

I'm using iPod 4th Gen iOS 6.1.3 and an iMac with 11.3 .. All latest versions. I have 23.4gb music according to the file but when I attached the iPod the bar at the foot of the page says 18.3gb. Some tracks are missing. Most if not all have been ripped from cd's into iTunes which is creating AAC format for each track. Other tracks play fine, some show the song but not the Artist and vice versa.
I have tried dragging the tracks from the Mac library to the IPod music file..nothing. So I go to Safari, type the question in and read the same problems over.. Are Apple aware of their Tutorials without troubleshooting pages ? Do they care?
My Pioneer DDJ/T1 is set up with Traktor and only wants to work with iTunes.. So iTunes are edging themselves in everywhere for everything... But it's still not working as it should..
Anyone have any clues please... Tried most all the ideas so far...

1) This is because of software version 1.1. See this
thread for some options as to how to go back to 1.0,
which will correct the problem...
http://discussions.apple.com/thread.jspa?threadID=3754
59&tstart=0
2) This tends to happen after videos. Give the iPod a
minute or two to readjust. It should now be more
accurate.
3) This?
iPod shows a folder icon with exclamation
point
4) Restore the iPod
5) Try these...
iPod Only Shows An Apple Logo and Will Not Start
Up
iPod Only Shows An Apple Logo
I think 3,4, and 5 are related. Try the options I
posted for each one.
btabz
I just noticed that one of the restore methods you posted was to put it into Disk Mode First rather than just use the resstore straight off, I Have tried that and seems to have solved the problem, If it has thank you. previously I have only tried just restoring it skipping this extra step. Hope my iPod stays healthy, if it doesnt its a warrenty job me thinks any way thanks again

Problems to show a Vertical JScrollPane with JList

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